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Page 1: SBF in SMRs - MartJustinR2013
Page 2: SBF in SMRs - MartJustinR2013

AN ABSTRACT OF THE THESIS OF

Justin R. Mart for the degree of Master of Science in Nuclear Engineering presented on June

14, 2013.

Title: Feasibility Study on a Soluble Boron-Free Small Modular Reactor

Abstract approved:

___________________________________________________________________________

Andrew C. Klein

The elimination of soluble boron creates several advantages for Small Modular Reactor

(SMR) operation. Most of these advantages are realized through significant core simplification

(removal of pipes, pumping, and purification systems), the removal of the corrosive effects of

soluble boron, and from improved safety effects. However, removing soluble boron creates its

own set of specific challenges that must be overcome.

Traditional pressurized water reactors employ soluble boron for uniform power suppression

throughout the core. Thus any boron-free SMR design requires increased dependence on

control rods and burnable poisons, where both are discrete neutron absorbers that locally

impact the core where they are inserted. Since control rods are partially inserted, their

presence negatively impacts the axial power profile and this distortion creates undesirable

power peaks, leading to a reduced operating margin and a significant economic burden.

Thus, the main challenge in any boron free design concerns excess reactivity suppression and

active reactivity control while maintaining a proper axial power profile and reduced power

peaks. The goal of the feasibility study is to investigate the physical effects of removing

soluble boron, and to investigate and identify an effective strategy for containing power peaks

in a boron-free SMR. Studsvik's CASMO-4E was employed to solve 2-D Transport equation

for infinite lattice analysis, and SIMULATE-3K was employed to solve 3-D nodal diffusion

equation for full core analysis.

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The study identified improved reactivity feedback mechanisms associated with the removal of

soluble boron, arising from a softened neutron flux and a decreased production of plutonium.

An analysis of strategies for soluble boron-free operation that involved axially grading

burnable poisons and U235 enrichment percentages was found unable to be able to control the

axial power profile throughout core lifetime. The inherent limitations in the lifetime of

burnable poisons resulted in an inability to control the axial power profile through middle and

end of cycle. Investigations of additional strategies involving an advanced control rod

algorithm produced significantly improved results that met the prescribed criteria for success.

The advanced control rod algorithm is thus recognized as a viable strategy for boron-free

operation for SMRs.

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© Copyright by Justin R. Mart June 14, 2013

All Rights Reserved

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Feasibility Study on a Soluble Boron-Free Small Modular Reactor

by

Justin R. Mart

A THESIS

submitted to

Oregon State University

in partial fulfillment of

the requirements for the

degree of

Master of Science

Presented June 14, 2013

Commencement June 2014

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Master of Science thesis of Justin R. Mart presented on June 14, 2013.

APPROVED:

___________________________________________________________________________

Major Professor, representing Nuclear Engineering

___________________________________________________________________________

Head of the Department of Nuclear Engineering and Radiation Health Physics

___________________________________________________________________________

Dean of the Graduate School

I understand that my thesis will become part of the permanent collection of Oregon State

University libraries. My signature below authorizes release of my thesis to any reader upon

request.

___________________________________________________________________________

Justin R. Mart, Author

Page 7: SBF in SMRs - MartJustinR2013

ACKNOWLEDGEMENTS

I would like to express sincere thanks to my advisor, Dr. Andrew Klein, for his immense

patience, guidance, and support through the scope of this project, helping me become a better

student and person.

I would also like to thank Dr. Alexey Soldatov for his specific help in navigating and

analyzing the reactor analysis software. The faculty members of Oregon State University

deserve credit for providing immense knowledge and support in the several aspects of this

project, as do the members of Dr. Klein’s Fringe group of Nuclear Engineering students for

their moral encouragement and technical help.

Lastly, I would like to acknowledge and thank all the people in my life that have encouraged

and supported me. My family in friends in particular, as without their support I would never

have found myself in this position.

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TABLE OF CONTENTS

Page

Chapter 1 - Introduction .............................................................................................................. 1

1.1 Overview of Nuclear Reactor Physics and Key Concepts ................................................ 2

1.1.1 Criticality and Multiplication Factors ........................................................................ 2

1.1.2 Prompt Neutron Lifetime and Delayed Neutron Fractions ........................................ 4

1.1.3 Power Peaks and Pin Peaking Factors ....................................................................... 6

1.1.4 Survey of the Different Methods of Excess Reactivity Compensation ..................... 7

1.2 Advantages and Disadvantages to Soluble Boron-Free Operation ................................. 13

1.2.1 Differences between Small Modular Reactors and Typical Light Water Reactors . 14

1.2.2 Advantages of Soluble Boron-Free Operation in Small Modular Reactors ............ 15

1.2.3 Disadvantages to Soluble Boron-Free Operation in Small Modular Reactors ........ 17

Chapter 2 – Literature Review .................................................................................................. 19

2.1 Survey of Current SMR Designs .................................................................................... 19

2.1.1 Babcock and Wilcox mPower ................................................................................. 19

2.1.2 NuScale Power SMR ............................................................................................... 20

2.1.3 Westinghouse SMR ................................................................................................. 21

2.2 Relevant Soluble Boron-Free Research and Development ............................................. 22

2.2.1 Feasibility Studies of a Soluble Boron-Free 900-MWe PWR ................................. 22

2.2.2 Elimination of Soluble-Boron for a New PWR Design ........................................... 24

2.2.3 A Soluble Boron-Free Core Design for the IRIS-50 ............................................... 24

2.2.4 Nuclear and Thermal Hydraulic Design Characteristics of the SMART Core ........ 26

Chapter 3 - Methodology .......................................................................................................... 28

3.1 Definition of research goals ............................................................................................ 28

3.2 Criteria for Success ......................................................................................................... 28

3.2.1 Criteria for Axial Offset .......................................................................................... 29

3.2.2 Criteria for Maximum Pin Peaking Factors ............................................................. 32

2.3 Available Tools for Reactor Design and Analysis .......................................................... 34

Chapter 4 – Reactor Design and Analysis ................................................................................ 37

4.1 The Selected SMR Design with Fuel Assembly Geometry and Characteristics ............ 37

4.2 Physical Effects of Soluble Boron-Free Operation ......................................................... 40

4.2.1 Multiplication Factor with and without Burnable Poisons ...................................... 40

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TABLE OF CONTENTS (Continued)

Page

4.2.2 Fuel Depletion and Plutonium Production .............................................................. 42

4.2.3. Neutron Flux and Energy Spectra .......................................................................... 46

4.2.4 Effective Fraction of Delayed Neutrons .................................................................. 49

4.2.5 Reactivity Feedback Mechanisms ........................................................................... 50

4.2.6 Conclusion ............................................................................................................... 56

4.3 Development and Analysis of Fuel Assemblies for use in Full Core Environment ....... 57

4.3.1 Burnable Poison Search ........................................................................................... 58

4.4 Description and Analysis of Initial Strategies for Soluble Boron-Free Operation in the Selected SMR Design ........................................................................................................... 76

4.4.1 Full Core Radial Loading Geometry ....................................................................... 76

4.4.2 Full Core Axial Loading Geometry ......................................................................... 79

Chapter 5 - Results ................................................................................................................... 84

5.1 First Group of Axially Graded SMR Cores .................................................................... 86

5.1.1 First Axially Graded SMR Core .............................................................................. 86

5.1.2 Further Axially Graded SMR cores from the First Group ....................................... 92

5.2 Second Group of Axially Graded SMR Cores ................................................................ 97

5.2.1 First Core from Second Group of Axially Graded SMR cores ................................ 97

5.2.2 Further Axially Graded SMR cores from the Second Group ................................ 102

5.3 Third Group of Axially Graded SMR Cores ................................................................ 107

5.3.1 First Core from Third Group of Axially Graded SMR Cores................................ 107

5.3.2 Further Axially Graded SMR cores from the Third Group ................................... 113

5.3 Fourth Group of Axially Graded SMR Cores ............................................................... 117

5.3.1 First core from Fourth group of axially graded SMR cores .................................. 118

5.3.2 Further Axially Graded SMR cores from the Fourth Group ................................. 124

5.5 Fifth Group of Axially Graded SMR Cores .................................................................. 129

5.5.1 First Core from Fifth Group of Axially Graded Cores .......................................... 131

5.5.2 Further Axially Graded SMR Cores from the Fifth Group ................................... 136

5.6 Conclusion .................................................................................................................... 143

Chapter 6 – Further Strategies for Soluble Boron-Free Operation ......................................... 144

6.1 Feasibility of the Advanced Control Rod Algorithm .................................................... 145

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TABLE OF CONTENTS (Continued)

Page

6.2 Final Advanced Control Rod Algorithm ...................................................................... 148

Chapter 7 – Conclusions ......................................................................................................... 153

7.1 Future Work .................................................................................................................. 156

7.1.1 Further Control Rod Algorithms and Axial Loading Strategies ............................ 156

7.1.2 Gadolinia-Oxide Burnable Poison Pellets ............................................................. 156

7.1.3 Partial Elimination of Soluble Boron .................................................................... 157

Bibliography ........................................................................................................................... 158

General Publications ........................................................................................................... 158

International Atomic Energy Agency Documents and Publications .................................. 163

Software Manuals and Descriptions ................................................................................... 164

Regulatory Documents ....................................................................................................... 165

Appendix ................................................................................................................................ 167

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LIST OF FIGURES

Figure Page

Figure 1: Axial power profile of a hypothetical boron-free reactor core. ................................. 30

Figure 2: Averaged axial power profile of two hypothetical boron-free cores vs core height (axial node). .............................................................................................................................. 31

Figure 3: Full core radial geometry. ......................................................................................... 39

Figure 4: kinf vs burnup for 5.0% U235 assemblies with varying amounts of soluble boron. .... 41

Figure 5: kinf vs burnup for poisoned 5.0% U235 fuel assemblies with varying amounts of soluble boron. ........................................................................................................................... 42

Figure 6: Weight percent of total Plutonium (Pu239 + Pu241) vs burnup for 5.0% U235 enriched fuel assemblies with varying amounts of soluble boron. .......................................................... 43

Figure 7: U238 neutron absorption cross section (barns) vs energy (MeV). ............................ 44

Figure 8: Total uranium and plutonium fission rate vs burnup in 5.0% U235 enriched fuel assemblies with varying amounts of soluble boron. ................................................................. 45

Figure 9: Weight percent of U235 vs burnup in 5.0% U235 enriched fuel assemblies with varying amounts of soluble boron. ......................................................................................................... 46

Figure 10: Total neutron flux vs burnup for 5.0% U235 enriched fuel assembly. ..................... 47

Figure 11: Fast neutron flux vs burnup for 5.0% U235 enriched assemblies. ............................ 48

Figure 12: Thermal neutron flux vs burnup for 5.0% U235 enriched assemblies. ..................... 48

Figure 13: Effective delayed neutron yield vs burnup for 5.0% U235 fuel assemblies. ............. 50

Figure 14: Fuel temperature coefficient vs burnup for hot full power, cold full power, and cold zero power with and without soluble boron. ............................................................................. 53

Figure 15: Moderator temperature coefficient for hot full power, cold full power, and cold zero power with and without soluble boron. ............................................................................. 55

Figure 16: kinf vs burnup for a poisoned and non-poisoned fuel assembly. .............................. 59

Figure 17: Burnable poison loading geometry for each of the 5 major groups. Red indicates a control rod, blue is a poisoned fuel pin, and white is a regular fuel pin. .................................. 60

Figure 18: kinf vs burnup for fuel each major burnable poison loading geometry. ................... 61

Figure 19: kinf vs burnup for 5.0% U235 enriched fuel assemblies with variations of all 5 BP geometries and with individually varied Gd2O3 weight percentages. ....................................... 63

Figure 20: kinf vs burnup for BP geometry 1 and 3, with 12% and 2% w/o Gd2O3. ................. 64

Figure 21: kinf vs burnup for final 5 fuel assemblies that exhibit a flat burnup profile. ............ 65

Figure 22: Poisoned pin geometry for fuel assemblies with strong initial reactivity compensation and quick Gd2O3 depletion. ............................................................................... 67

Figure 23: kinf vs burnup for 5.0% U235 fuel assemblies with 64 poisoned pins. ...................... 67

Figure 24: Burnable poison loading geometry with 52 and 64 poisoned pins. ......................... 68

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LIST OF FIGURES (Continued)

Figure Page

Figure 25: kinf vs burnup for 5.0% U235 enriched fuel assemblies with 52 and 56 pins poisoned with 5.0% and 6.0% w/o Gd2O3. .............................................................................................. 69

Figure 26: Five different burnable poison loading geometries for fuel assemblies with strong initial reactivity compensation and slow depletion. .................................................................. 70

Figure 27: kinf vs burnup for 5.0% U235 enriched fuel assemblies with various numbers of poisoned fuel pins at 5.0% w/o Gd2O3...................................................................................... 71

Figure 28: kinf vs burnup for 5.0% U235 enriched fuel assemblies with various numbers of poisoned fuel pins at 6.0% w/o Gd2O3...................................................................................... 72

Figure 29: Five different burnable poison loading geometries for fuel assemblies with extraordinarily large initial reactivity compensation. ............................................................... 73

Figure 30: kinf vs burnup for 5.0% U235 enriched fuel assemblies with various numbers of poisoned fuel pins (from Figure 29) at 2.0% w/o Gd2O3. ......................................................... 74

Figure 31: kinf vs burnup for 5.0% U235 enriched fuel assemblies with various numbers of poisoned fuel pins (from Figure 29) at 3.0% w/o Gd2O3. ......................................................... 74

Figure 32: kinf vs burnup for 5.0% U235 enriched fuel assemblies with various numbers of poisoned fuel pins (from Figure 29) at 4.0% w/o Gd2O3. ......................................................... 75

Figure 33: 2-Dimensional U235 Enrichment Loading Geometry............................................... 77

Figure 34: Relative power fraction for the U235 enrichment loading geometry. ....................... 78

Figure 35: Natural power profile for soluble boron-free core at BOC and EOC. ..................... 82

Figure 36: Full core symmetry. ................................................................................................ 85

Figure 37: Burnable poison loading and average U235 enrichment vs core height for the first core in the first group of axially graded cores. ......................................................................... 86

Figure 38: 5.0% U235 enriched “Flat burn” fuel assemblies that were employed in the first group of axially graded cores. .................................................................................................. 87

Figure 39: Average burnable poison loading (grams) per node for the first axial core. ........... 88

Figure 40: Fuel assembly U235 enrichment per node for the first axial core. ............................ 89

Figure 41: Axial offset and control rod insertion vs burnup for the first core. ......................... 91

Figure 42: Maximum total peaking factor vs burnup for the first core and soluble boron core. .................................................................................................................................................. 91

Figure 43: Burnable poison loading vs core height for all cores in the first group of axially graded cores. ............................................................................................................................. 93

Figure 44: Average U235 enrichment vs core height for the first group of axially graded cores. .................................................................................................................................................. 94

Figure 45: Axial power offset vs burnup for the first group of axially graded cores. .............. 95

Figure 46: Control rod insertion vs burnup for the first group of axially graded cores. ........... 95

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LIST OF FIGURES (Continued)

Figure Page

Figure 47: Maximum total peaking factor vs burnup for the first group of axially graded cores. .................................................................................................................................................. 96

Figure 48: Burnable poison loading and average U235 enrichment vs core height for the 9th core. .......................................................................................................................................... 98

Figure 49: Average burnable poison loading (grams) per node for the 9th core. ..................... 99

Figure 50: Fuel assembly U235 enrichment per node for the 9th core. .................................... 100

Figure 51: Axial offset and control rod insertion percentage vs burnup for the 9th core. ...... 101

Figure 52: Maximum total peaking factor vs burnup for the 9th core. ................................... 102

Figure 53: Burnable poison loading vs core height for the 2nd group of axially graded cores. ................................................................................................................................................ 103

Figure 54: Average U235 enrichment vs core height for the 2nd group of axially graded cores. ................................................................................................................................................ 104

Figure 55: Axial power offset vs burnup for the 2nd group of axially graded cores. ............. 105

Figure 56: Control rod insertion for the second group of axially graded cores. ..................... 105

Figure 57: kinf vs burnup for fuel assemblies used in cores 11 and 12. .................................. 106

Figure 58: Maximum total peaking factor vs burnup for the second group of cores. ............. 107

Figure 59: kinf vs burnup for fuel assemblies used in the third group of cores. ...................... 108

Figure 60: Burnable poison loading and average U235 enrichment vs core height for the first core in the third group of axially graded cores. ...................................................................... 109

Figure 61: Average burnable poison loading (grams) per node for the 14th core. ................. 110

Figure 62: Assembly U235 enrichment per node for the 14th core. ......................................... 111

Figure 63: Axial offset and control rod insertion percentage vs burnup for the 14th core. .... 112

Figure 64: Maximum total peaking factor vs burnup for the 14th core and a soluble boron core. ........................................................................................................................................ 113

Figure 65: Burnable poison loading vs core height for the third group of cores. ................... 114

Figure 66: Average U235 enrichment vs core height for the third group of cores. .................. 114

Figure 67: Axial power offset vs burnup for the third group of cores. ................................... 115

Figure 68: Control rod insertion vs burnup for the third group of cores. ............................... 116

Figure 69: Maximum total peaking factor vs burnup for the third group of cores. ................ 117

Figure 70: Burnable poison loading and average U235 enrichment vs core height for the 23rd core. ........................................................................................................................................ 119

Figure 71: kinf vs burnup for the fuel assemblies used in the fourth group of cores. .............. 120

Figure 72: Average burnable poison loading (grams) per node for the 23rd core. ................. 121

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LIST OF FIGURES (Continued)

Figure Page

Figure 73: Fuel assembly U235 enrichment per node for the 23rd core. .................................. 122

Figure 74: Axial offset and control rod insertion vs burnup for the 23rd core. ...................... 123

Figure 75: Maximum total peaking factor vs burnup for the 23rd core and a soluble boron core. ........................................................................................................................................ 124

Figure 76: Burnable poison loading vs core height for the fourth group of cores. ................. 125

Figure 77: Average U235 enrichment vs core height for the fourth group of cores. ................ 126

Figure 78: Axial power offset vs burnup for the fourth group of cores. ................................. 127

Figure 79: Control rod insertion vs burnup for the fourth group of cores. ............................. 128

Figure 80: Maximum total peaking factor vs burnup for the fourth group of cores. .............. 129

Figure 81: kinf vs burnup for fuel assemblies used in the fifth group of cores. ....................... 130

Figure 82: Burnable poison loading and average U235 enrichment vs core height for the 30th core. ........................................................................................................................................ 131

Figure 83: Average burnable poison loading (grams) per node for the 30th core. ................. 133

Figure 84: Fuel assembly U235 enrichment per node for the 30th core. .................................. 134

Figure 85: Axial offset and control rod insertion vs burnup for the 30th core. ...................... 135

Figure 86: Maximum total peaking factor vs burnup for the 30th core. ................................. 136

Figure 87: Burnable poison loading vs core height for the fifth group of cores. .................... 136

Figure 88: Average U235 enrichment vs core height for the fifth group of cores. ................... 137

Figure 89: Axial power offset vs burnup for the fifth group of cores. .................................... 138

Figure 90: Control rod insertion vs burnup for the fifth group of cores. ................................ 139

Figure 91: Relative power fraction and average exposure at 11 MWd/Kg for core 34. ......... 140

Figure 92: Maximum total peaking factor vs burnup for the fifth group of cores. ................. 141

Figure 93: Depletion stages for an initial control rod algorithm designed to contain the axial power profile. .......................................................................................................................... 146

Figure 94: Axial offset and control rod insertion vs burnup for the initial control algorithm. 147

Figure 95: Maximum total peaking factor vs burnup for the initial control rod algorithm. ... 148

Figure 96: kinf vs burnup for the fuel assembly used in the final control rod algorithm. ........ 149

Figure 97: Fuel assembly U235 enrichment and burnable poison loading profile for the final advanced control rod algorithm. ............................................................................................. 149

Figure 98: Depletion stages for the final advanced control rod algorithm. ............................ 150

Figure 99: Axial offset and control rod insertion percentage vs burnup for the final control rod algorithm. ................................................................................................................................ 151

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LIST OF FIGURES (Continued)

Figure Page

Figure 100: Maximum pin peaking factor vs burnup for the final control rod algorithm. ..... 152

Figure 101: Axial offset vs burnup for the boron-free core with axially graded burnable poisons, the boron-free core with the final control rod algorithm, and for a soluble boron core. ................................................................................................................................................ 154

Figure 102: Maximum pin peaking factor vs burnup for the boron-free core with axially graded burnable poisons, the boron-free core with the final control rod algorithm, and for a soluble boron core................................................................................................................... 155

Figure 103: Average burnable poison loading (grams) per node for the 1st core .................. 168

Figure 104: Fuel assembly U235 enrichment per node for the 1st core. .................................. 169

Figure 105: Average burnable poison loading (grams) per node for the 2nd core. ................ 170

Figure 106: Fuel assembly U235 enrichment per node for the 2nd core. ................................. 171

Figure 107: Average burnable poison loading (grams) per node for the 3rd core. ................. 172

Figure 108: Fuel assembly U235 enrichment per node for the 3rd core. .................................. 173

Figure 109: Average burnable poison loading (grams) per node for the 4th core .................. 174

Figure 110: Fuel assembly U235 enrichment per node for the 4th core. .................................. 175

Figure 111: Average burnable poison loading (grams) per node for the 5th core. ................. 176

Figure 112: Fuel assembly U235 enrichment per node for the 5th core. .................................. 177

Figure 113: Average burnable poison loading (grams) per node for the 6th core. ................. 178

Figure 114: Fuel assembly U235 enrichment per node for the 6th core. .................................. 179

Figure 115: Average burnable poison loading (grams) per node for the 7th core. ................. 180

Figure 116: Fuel assembly U235 enrichment per node for the 7th core. .................................. 181

Figure 117: Average burnable poison loading (grams) per node for the 8th core. ................. 182

Figure 118: Fuel assembly U235 enrichment per node for the 8th core. .................................. 183

Figure 119: Average burnable poison loading (grams) per node for the 9th core. ................. 184

Figure 120: Fuel assembly U235 enrichment per node for the 9th core. .................................. 185

Figure 121: Average burnable poison loading (grams) per node for the 10th core. ............... 186

Figure 122: Fuel assembly U235 enrichment per node for the 10th core. ................................ 187

Figure 123: Average burnable poison loading (grams) per node for the 11th core. ............... 188

Figure 124: Fuel assembly U235 enrichment per node for the 11th core. ................................ 189

Figure 125: Average burnable poison loading (grams) per node for the 12th core. ............... 190

Figure 126: Fuel assembly U235 enrichment per node for the 12th core. ................................ 191

Figure 127: Average burnable poison loading (grams) per node for the 13th core. ............... 192

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LIST OF FIGURES (Continued)

Figure Page

Figure 128: Fuel assembly U235 enrichment per node for the 13th core. ................................ 193

Figure 129: Average burnable poison loading (grams) per node for the 14th core. ............... 194

Figure 130: Fuel assembly U235 enrichment per node for the 14th core. ................................ 195

Figure 131: Average burnable poison loading (grams) per node for the 15th core. ............... 196

Figure 132: Fuel assembly U235 enrichment per node for the 15th core. ................................ 197

Figure 133: Average burnable poison loading (grams) per node for the 16th core. ............... 198

Figure 134: Fuel assembly U235 enrichment per node for the 16th core. ................................ 199

Figure 135: Average burnable poison loading (grams) per node for the 17th core. ............... 200

Figure 136: Fuel assembly U235 enrichment per node for the 17th core. ................................ 201

Figure 137: Average burnable poison loading (grams) per node for the 18th core. ............... 202

Figure 138: Fuel assembly U235 enrichment per node for the 18th core. ................................ 203

Figure 139: Average burnable poison loading (grams) per node for the 19th core. ............... 204

Figure 140: Fuel assembly U235 enrichment per node for the 19th core. ................................ 205

Figure 141: Average burnable poison loading (grams) per node for the 20th core. ............... 206

Figure 142: Fuel assembly U235 enrichment per node for the 20th core. ................................ 207

Figure 143: Average burnable poison loading (grams) per node for the 21st core. ............... 208

Figure 144: Fuel assembly U235 enrichment per node for the 21st core. ................................ 209

Figure 145: Average burnable poison loading (grams) per node for the 22nd core. .............. 210

Figure 146: Fuel assembly U235 enrichment per node for the 22nd core. ............................... 211

Figure 147: Average burnable poison loading (grams) per node for the 23rd core. ............... 212

Figure 148: Fuel assembly U235 enrichment per node for the 23rd core. ................................ 213

Figure 149: Average burnable poison loading (grams) per node for the 24th core. ............... 214

Figure 150: Fuel assembly U235 enrichment per node for the 24th core. ................................ 215

Figure 151: Average burnable poison loading (grams) per node for the 25th core. ............... 216

Figure 152: Fuel assembly U235 enrichment per node for the 25th core. ................................ 217

Figure 153: Average burnable poison loading (grams) per node for the 26th core. ............... 218

Figure 154: Fuel assembly U235 enrichment per node for the 26th core. ................................ 219

Figure 155: Average burnable poison loading (grams) per node for the 27th core. ............... 220

Figure 156: Fuel assembly U235 enrichment per node for the 27th core. ................................ 221

Figure 157: Average burnable poison loading (grams) per node for the 28th core. ............... 222

Figure 158: Fuel assembly U235 enrichment per node for the 28th core. ................................ 223

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LIST OF FIGURES (Continued)

Figure Page

Figure 159: Average burnable poison loading (grams) per node for the 29th core. ............... 224

Figure 160: Fuel assembly U235 enrichment per node for the 29th core. ................................ 225

Figure 161: Average burnable poison loading (grams) per node for the 30th core. ............... 226

Figure 162: Fuel assembly U235 enrichment per node for the 30th core. ................................ 227

Figure 163: Average burnable poison loading (grams) per node for the 31st core. ............... 228

Figure 164: Fuel assembly U235 enrichment per node for the 31st core. ................................ 229

Figure 165: Average burnable poison loading (grams) per node for the 33rd core. ............... 230

Figure 166: Fuel assembly U235 enrichment per node for the 33rd core. ................................ 231

Figure 167: Average burnable poison loading (grams) per node for the 34th core. ............... 232

Figure 168: Fuel assembly U235 enrichment per node for the 34th core. ................................ 233

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LIST OF TABLES

Table Page

Table 1: SMR Fuel Assembly Specifications ........................................................................... 38

Table 2: SMR Full Core Specifications .................................................................................... 39

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Feasibility Study on a Soluble Boron-Free Small Modular Reactor

Chapter 1 - Introduction

The world’s energy sector is currently driven by a majority of fossil fuel power plants.

In order to address and meet national and global requirements for clean, efficient, and

consistent energy production designed to meet a growing demand for energy from developing

nations, new and innovative nuclear reactor technologies will need to be developed. Part of

this initiative includes the potential for smaller, modular nuclear reactors (SMRs) [6, 32, 33].

These SMRs possess inherent safety advantages, and have the potential to be deployed

in developing nations without the infrastructure needed for traditional nuclear power plants

[44]. In this vein, any improvement to the inherent safety features and overall reactor

operation in SMRs is of value.

The presence of soluble boron diluted in the coolant is typical in most current SMR

designs [46], despite the inherent safety and reliability advantages that could be realized upon

its removal [15, 24, 43]. While removing soluble boron brings inherent advantages, it also

significantly complicates the manner in which the nuclear core is operated. These

complications make effective operation of a soluble boron-free core difficult. This study aims

to design an effective soluble boron-free SMR and investigate how the removal of soluble

boron from normal operations impacts core behavior.

State of the art tools used for modeling traditional LWRs was employed to evaluate

different design strategies, and to generate data for analysis of boron-free operation. The study

is organized in the following manner:

1) Overview of nuclear reactor physics and key concepts

2) Description of advantages and disadvantages for soluble boron-free operation

3) Literature review of current SMR designs and previous boron-free research

4) Investigation on the physical effects of soluble boron-free operation

5) Search for a soluble boron-free SMR core design that meets design criteria

6) Conclusions

Page 20: SBF in SMRs - MartJustinR2013

2

1.1 Overview of Nuclear Reactor Physics and Key Concepts

Nuclear reactor operation is centered on ensuring the chain reaction maintains criticality

while providing sufficient heat removal to avoid meltdown. The operations involving heat

removal are relegated to the thermal hydraulic discipline, while concerns about criticality

involve neutronic calculations within the reactor core. This distinction provides an effective

divide between two largely separate disciplines. This study focuses primarily with the nuclear

core and issues relating to its operation and behavior. It is assumed that normal operating

conditions exist, i.e. that there will always be sufficient heat removal for the operating

specifications provided.

1.1.1 Criticality and Multiplication Factors

A working definition of criticality involves a quick survey of neutron behavior in a

nuclear reactor. In traditional Light Water Reactors (LWRs), so named for their use of light

water as both a moderator and coolant, U235 is employed as fuel. When a neutron is absorbed

in U235, it undergoes a fission process that splits the atom in two, creating two smaller

elements. As it turns out, this process is exothermic, releasing the bulk of excess energy

through kinetic energy in the smaller fission products. But it also releases an assortment of

gamma rays, anti-neutrinos, and neutrons themselves. On average, for reactions typical to

LWRs, each fission event produces 2.4 extra neutrons. If properly engineered, these neutrons

can be absorbed in another U235, creating a chain of fission reactions that is the backbone of

nuclear reactors.

In mathematical terms, criticality is defined by the rate of change of the neutron

population in the core. This rate of change equation begins as:

𝑑𝑑𝑡𝑛(𝑡) = # 𝑜𝑓 𝑠𝑜𝑢𝑟𝑐𝑒 𝑛𝑒𝑢𝑡𝑟𝑜𝑛𝑠 𝑝𝑟𝑜𝑑𝑢𝑐𝑒𝑑 − # 𝑜𝑓 𝑛𝑒𝑢𝑡𝑟𝑜𝑛𝑠 𝑙𝑜𝑠𝑡

For nuclear reactors, the only significant process producing neutrons are fission events

within the fuel. Additionally, the only methods by which neutrons are lost are absorption

events that do not produce fission events, and neutrons leaking from the system. Reflecting

this, the rate of change of neutrons can be defined as:

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𝑑𝑑𝑡𝑛(𝑡) = # 𝑜𝑓 𝑓𝑖𝑠𝑠𝑖𝑜𝑛 𝑛𝑒𝑢𝑡𝑟𝑜𝑛𝑠 𝑝𝑟𝑜𝑑𝑢𝑐𝑒𝑑 − (# 𝑜𝑓 𝑛𝑒𝑢𝑡𝑟𝑜𝑛𝑠 𝑎𝑏𝑠𝑜𝑟𝑏𝑒𝑑

+ # 𝑜𝑓 𝑛𝑒𝑢𝑡𝑟𝑜𝑛𝑠 𝑙𝑒𝑎𝑘𝑖𝑛𝑔 𝑓𝑟𝑜𝑚 𝑡ℎ𝑒 𝑠𝑦𝑠𝑡𝑒𝑚)

While this definition is useful on a technical scale, it is more useful to employ the

concept of a multiplication factor, describing the balance between neutron production and

neutron loss:

𝑘0 =𝑅𝑎𝑡𝑒 𝑜𝑓 𝑛𝑒𝑢𝑡𝑟𝑜𝑛 𝑝𝑟𝑜𝑑𝑢𝑐𝑡𝑖𝑜𝑛 𝑖𝑛 𝑟𝑒𝑎𝑐𝑡𝑜𝑟

𝑅𝑎𝑡𝑒 𝑜𝑓 𝑛𝑒𝑢𝑡𝑟𝑜𝑛 𝑙𝑜𝑠𝑠 𝑖𝑛 𝑟𝑒𝑎𝑐𝑡𝑜𝑟=𝐺(𝑡)𝐿(𝑡)

In this manner, it is easy to see that if the value of 𝑘0 < 1 then the number of neutrons

will decay to 0, representing a situation where less than one neutron (on average) produces a

fission event, and the neutron economy logarithmically declines until no neutrons are left in

the system and the chain reaction dies. Conversely, if 𝑘0 > 1 then a situation where more than

one neutron (on average) produces a fission event and the neutron economy exponentially

grows until some other process prohibits more fission events. Appropriately, for steady-state

reactor operation the target is to engineer a system where 𝑘0 = 1, with exactly one neutron

(on average) from each fission event producing another fission event. The moment this ratio is

met, the reactor is said to be critical [26]. Any amount above or below is respectively dubbed

subcritical or supercritical.

Accordingly, if the number of neutrons in the system at time 𝑡 = 0 is 𝑁0, then the

number of neutrons after the first generation will be:

𝑁1 = 𝐾0𝑁0

If we further define the mean neutron lifetime as:

𝑙 =# 𝑜𝑓 𝑛𝑒𝑢𝑡𝑟𝑜𝑛𝑠 𝑖𝑛 𝑡ℎ𝑒 𝑠𝑦𝑠𝑡𝑒𝑚 𝑎𝑡 𝑡𝑖𝑚𝑒 (𝑡)

𝑅𝑎𝑡𝑒 𝑜𝑓 𝑛𝑒𝑢𝑡𝑟𝑜𝑛 𝑙𝑜𝑠𝑠 𝑖𝑛 𝑡ℎ𝑒 𝑠𝑦𝑠𝑡𝑒𝑚 𝑎𝑡 𝑡𝑖𝑚𝑒 (𝑡)=𝑁(𝑡)𝐿(𝑡)

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Then we can reformulate the neutron rate of change as:

𝑑𝑑𝑡𝑛(𝑡) = 𝐺(𝑡) − 𝐿(𝑡) = 𝑘0𝐿(𝑡) − 𝐿(𝑡)

This is to say that the rate of change of neutrons in the system can be expressed as the

difference between the rate of neutron production and the rate of neutron loss. Here, the rate of

neutron production is put in terms of the multiplication factor and the rate of neutron loss, and

the equation simplifies to:

𝑑𝑑𝑡𝑛(𝑡) = 𝑘0𝐿(𝑡) − 𝐿(𝑡) = (𝑘0 − 1)𝐿(𝑡) =

(𝑘0 − 1)𝑙

𝑁(𝑡)

where 𝑁(𝑡) represents the number of neutrons in the system at time 𝑡. The solution to this

differential equation is:

𝑁(𝑡) = 𝑁(0)𝑒�(𝑘0−1)

𝑙 �𝑡

if 𝑘0 and 𝑙 are independent of time. This final equation expresses the neutron population as a

function of time by employing both the multiplication factor and the mean neutron lifetime.

Provided that there is a nonzero number of initial neutrons, the only steady-state solution

exists when the reactor is critical (𝑘0 = 1).

1.1.2 Prompt Neutron Lifetime and Delayed Neutron Fractions

The final equation for the neutron population with respect to time through the

multiplication factor and the average neutron lifetime highlights how the overall neutron

economy in the core is impacted by the mean neutron lifetime. Specifically, the rate of neutron

growth is inversely proportional to the value of the mean neutron lifetime. In reactors with a

small mean neutron lifetime, small perturbations in 𝑘0 will quickly influence the overall

neutron population.

On a physical level, a thermal neutron is defined as a neutron in thermal equilibrium

with its surroundings [13]. At room temperature and atmospheric conditions, thermal neutrons

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possess an average energy of 0.0025 eV and travel at approximately 2200 m/s [26]. Nuclear

reactors operate at much higher temperatures and pressures, which only increases the velocity

of thermal neutrons. Neutrons at such speeds will rapidly interact with reactor core material

through either scattering collisions or absorption events, resulting in an effective neutron total

lifetime from birth to death on the order of 10-6 seconds [13].

With such a quick neutron lifetimes, this would ordinarily make any nuclear reactor far

too responsive to control. If any amount of reactivity is added, the reactor would respond far

too fast for any human or mechanical intervention. The saving grace comes in the form of

delayed neutron fraction, or the fraction of neutrons that are emitted after the initial fission

event.

Most neutrons are produced instantaneously upon fission, and are hence referred to as

“prompt neutrons.” However, small portions of the overall fraction of neutrons are produced

after the initial fission, when some fission products are initially unstable and decay through the

emission of a neutron. These “delayed neutrons” account for approximately 0.27% of all

neutrons produced in a fission event for typical U235 fueled reactors [13]. Since the half-lives

of these various unstable fission products widely vary, so do individual delayed neutron

lifetimes. On average, the lifetime for delayed neutrons is on the order of seconds, not

microseconds. Thus, even though they only account for a tiny fraction of all neutrons, their

longer lifetime accounts for a significant increase in the overall average neutron lifetime. This

overall impact on the neutron economy creates a situation where reactor operators and core

designers can control reactor criticality through just the delayed neutron fraction, making it

possible to control criticality through human and mechanical intervention.

This places particular importance on the delayed neutron percentage throughout the

lifetime of the reactor. This value is impacted by several nuanced factors. Delayed neutrons

are born from fission products, and the fission products are functions of neutron energy

incident on U235. This neutron energy is in turn impacted by the overall neutron flux spectrum

within the core, which is in turn a function of several different variables. The exact nature of

how the delayed neutron fraction changes throughout burnup is difficult to define with

specificity, but its value is undoubtedly an important factor for the nuclear reactor engineer.

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1.1.3 Power Peaks and Pin Peaking Factors

As part of LWR safety regulations, core designers must ensure specific temperature

limits are not surpassed in any postulated operating condition including anticipated accident

scenarios. The critical temperature limit in LWRs occurs at the center of the fuel pin, where if

temperatures exceed 2200K melting is likely to occur [38]. As part of a conservative design

analysis, several other constraints arise to ensure this one temperature limit is not exceeded.

One constraint involves the maximum power density for any specific fuel rod, and the

maximum power density for any specific fuel volume. Said mathematically, if P signifies

reactor power and V signifies core volume, then:

𝑃�′′′ = 𝑃𝑉

which defines the core-averaged power density. Appropriately, the ratio of maximum power

density for any specific fuel volume to the core-averaged power density supplies a power

peaking factor:

𝐹𝑞 =𝑃𝑚𝑎𝑥′′′

𝑃�′′′

The value of this peaking factor signifies the general power density profile throughout

the reactor core. A large peaking factor signifies at least one hot spot in the reactor where the

power density is significantly larger than the core-average power density. Since power density

is directly related to neutron flux and fuel temperature, power peaking factors directly

correlate to fuel temperature design constraints. And since no part of a reactor core can exceed

the established temperature limits, a primary concern for the reactor design engineer is the

value of the maximum hot spot within a reactor core at all postulated operating conditions

[38]. A higher peaking factor must therefore drive down the overall power density of the core

in order to ensure this hot spot does not exceed the design constraints. This limits the

efficiency of the reactor and represents a significant economic loss to the utility.

As a result, limiting power peaking factors are a primary focus for core designers.

Minimizing the peaking factors is primarily a function of reactor physics, since non-uniform

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distributions of fuel enrichment, the position of control rods and burnable poisons, and other

neutronic concerns largely influence the power density profile. Since removing soluble boron

from reactor operations involves a greater dependence on control rods and burnable poisons,

the effect on peaking factors must be carefully evaluated and minimized.

1.1.4 Survey of the Different Methods of Excess Reactivity Compensation

Nuclear Power Plants (NPPs) are typically engineered to operate for years before

requiring refueling [13]. During that period the amount of U235 is gradually depleted as each

fission event removes a fuel element from the core (neglecting the production of Plutonium

and other fissile effects). To combat this burnup effect, a fresh new fuel assembly is loaded

with an excess amount of U235. Without any compensation for this excess U235, a reactor

would go supercritical, requiring some amount of control material to be inserted into the core

to combat the extra reactivity. The amount of control material required to bring the core from

supercritical to critical is dubbed “excess reactivity” [13].

Compensation of excess reactivity is therefore one of the primary concerns for safe

operation of nuclear power plants. Fuel assemblies of typical LWRs contain excess U235 to

facilitate extended core lifetimes [26]. In these LWRs the arrangement of the fuel pins and the

presence of water as a moderator are optimized for criticality. Without any mechanism to

break the neutron chain reaction, these reactor cores would go supercritical.

To compensate for this, LWRs employ three main methods of compensating for this

excess reactivity. The first is the presence of fuel pins that contain strong neutron absorbing

materials instead of fuel. These neutron poisons significantly reduce the thermal neutron

economy when inserted into the core as a function of distance inserted, the absorber material,

and the density of said material. These control rods provide active control of the neutron chain

reaction, as the reactor operators are able to manually adjust the insertion distance.

The second method of excess reactivity compensation involves the presence of strong

neutron absorbing materials mixed into the fuel itself. The amount and resultant density of the

fuel and absorber mixture is carefully engineered beforehand to compensate for an appropriate

amount of excess reactivity. This use of this method employs “burnable poisons,” since these

strong neutron poisons will slowly deplete as more and more neutrons are absorbed and the

poisons are burned up. This effect allows engineers to compensate for the excessive initial

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reactivity, without significantly influencing core behavior later in life. However, this method

only provides passive control over reactivity. Once the fuel pins are fabricated with the

burnable poisons, they cannot be altered.

The last form of reactivity compensation comes from diluting a strong neutron absorber

within the moderator. In LWRs, all fast neutrons are thermalized within the moderator, and the

presence of a strong neutron absorber within the moderator serves to control the thermal

neutron economy. Typically, concentrations of this soluble-absorber (typically Boron) are in

the order of 800 to 2000 parts-per-million (ppm) [13]. This method allows for active control of

the neutron economy through the presence of a Chemical Volume Control System, which

purges or adds absorbing material in the coolant, among other functions [38].

These three methods of compensation all involve the presence of strong neutron

poisons. However there are different ways to suppress the excess reactivity, but they must be

engineered into core and plant design up front. Since the dynamics of a chain reaction involve

multiple different variables that are functions of one another, the ability to influence some of

these key variables results in an additional method to suppress excess core reactivity.

To demonstrate this effect, it would be a useful exercise to consider what may happen if

all three main methods of compensation were absent. In this scenario, the core would go

supercritical due to the previously mentioned criticality-optimized core environment. Recall

the definition of supercritical is an environment where the number of neutrons increases from

one generation to the next. Since LWRs only contain one dominant neutron source (U235), the

increase in neutrons must come from the fission of U235. These fission events release on

average approximately 200 MeV of energy, with 95% coming in the form of kinetic energy, or

heat [38].

These fission events increase proportionally with the number of thermal neutrons

present, resulting in a rapid increase in temperature within the fuel pins and extending into the

moderator. The rate of increase is governed by the average neutron lifetime, which in LWRs is

on the order of 10-6 sec.

At this point, the heat produced in the fuel pins quickly begins to affect other variables

that influence the neutron chain reaction. Most notable is the moderator temperature, and thus

density. As the temperature rapidly increases, the density of water surrounding the fuel pins

quickly decreases, which in turn results in fewer thermal neutrons due to a decrease in the

number of neutron scattering events within the moderator.

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This loss of thermal neutrons due to a decrease in moderator density provides a natural

mechanism to combat the fission chain reaction, specifically known as the Moderator

Temperature Coefficient (MTC). Other effects similar to this one comprise additional,

physical methods used to naturally control a runaway chain reaction. But these effects cannot

be actively controlled by reactor operators and must be engineered beforehand, and only effect

operations in accident scenarios. For these reasons, the three main methods of compensating

for excess reactivity are important factors for safe operation of nuclear reactors. Removing

one of the three involves a detailed discussion on the resulting safety and operational impacts.

1.1.4.1 Strengths and weaknesses of the different methods of excess reactivity compensation

Control rods are absolutely essential in any LWR design, due to their ability to provide

active reactivity control. Reactor operators retain the ability to manually and quickly insert

control rods into the core, providing both an effective way to immediately shut the chain

reaction off, and a way to fine-tune the level of reactivity within the core as reactor transients

fluctuate. Typically, the fine tuning ability is left to automated devices, in part since typical

LWR periods (total time required for the reactor to increase by a factor of 𝑒) are too small for

manual human operation [13]. Manual human operation would also be tedious and create

room for mistakes, whereas automated functions provide a higher level of certainty and

reliability. However, in contrast to control rods the other two main methods of reactivity

compensation are even slower.

The devices that physically insert and remove control rods are known as control rod

drive mechanisms (CRDM), and can be prone to operational issues since their presence in a

highly radioactive environment leads to occasional malfunction [26]. In some LWRs, these

CRDMs exist outside the main containment vessel to shield them from these effects, but that

carries a rod ejection risk due to the pressure differential between the inside and outside of

containment [45, 49]. However, these risks are necessary evils since the control rods represent

the only active means of controlling the neutron economy.

Additionally, control rods have a disturbing impact on the neutron flux profile within

the core. Since specific locations in each individual fuel assembly are reserved for control rods

instead of fuel pins, their effect on the neutron economy is localized to that specific area.

Imagine a neutron flux profile in a well-designed LWR as a water bed. Without any objects

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resting on the bed, the profile would be flat and undisturbed. In this example, control rods are

represented by bowling balls. Toss a few balls onto the bed and the neutron flux profile would

be greatly suppressed in the areas localized to the bowling balls, but also pushed up in the

undisturbed areas. In this respect, control rods create imbalances in the neutron flux, which in

turn creates larger pin-peaking and hot-rod factors.

Furthermore, control rod banks are inserted together at the same axial depth. If control

rods are partially inserted into the core, the absorbing effects will only be axially felt in the

area where control rods are present. The resulting global effect on the neutron flux yields an

axially skewed neutron profile. The neutron flux in the top half of the core would be

suppressed, while the bottom half would be increased. Once again, this axial flux imbalance

creates larger pin-peaking and hot-rod factors.

Mitigating these effects on the neutron flux profile is a motivation for the introduction

of the other two methods of reactivity compensation. However, another motivation arises from

a safety standpoint, where reactor engineers must demonstrate the ability to properly shut

down the reactor in its most reactive state and with the most reactive control rod stuck in a

position withdrawn from the core (the “stuck rod” criteria) [62]. Using only control rods, this

criterion would be difficult to achieve with a fresh core at the beginning of its cycle (BOC),

and at cold, room temperature conditions (since the excess reactivity is greatest with a fresh

core that has not experienced any depletion). In typical LWRs, the amount of excess reactivity

at BOC exceeds the total amount of reactivity compensated by control rods, requiring the

presence of additional compensation methods [26].

Additionally, the regulatory framework within the Nuclear Regulatory Commission

(NRC) requires reactors to meet “defense-in-depth” criteria. For LWRs, this criteria can be

summarized as requiring reactors to possess redundant layers of defense to compensate for

potential human and mechanical failures so that no single layer, no matter how robust, is

exclusively relied upon [65]. These factors necessitate the presence of additional methods of

reactivity compensation.

Burnable poisons function primarily to reduce the initial excess reactivity to more

manageable levels. Since they burn out over time, their effect is only felt from the BOC to the

middle of cycle (MOC), making their presence relatively benign. However, there are a vast

number of factors that engineers must keep in mind when designing a burnable poison

arrangement. The location and total amount of burnable poisons within each fuel assembly

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should be carefully selected in order to minimize the effect they will have on the neutron flux

distribution, due to their localized effect on the neutron population (similar to control rods).

Additionally, shadowing and shielding effects within poisoned fuel pins will preserve some

U235, leaving a slightly higher and more reactive fuel pin once the poisons have depleted. This

additional reactivity can also carry flux distribution implications.

Finally, soluble boron represents the third part of a diverse, independent and redundant

scheme for reactivity control, and its main advantage lies in the ability to suppress the neutron

population uniformly over the radial and axial profile of the core. If the neutron profile within

a reactor is analogous to a water bed, control rods and burnable poisons could be represented

by bowling balls tossed on to the bed, while soluble-boron is more analogous to a blanket

uniformly depressing the neutron flux everywhere.

This is not a perfect example since its effect is only localized to the moderator, but

since the moderator covers such a large portion of the core, the analogy largely holds. This

allows reactor operators to control the reactivity within the core in a uniform manner, reducing

pin-peaking and hot-rod issues associated with control rods and burnable poisons.

Unfortunately, soluble Boron carries with it a number of issues. First, Boron is

corrosive. Its presence in the core will increase corrosion on the primary loop and the reactor

pressure vessel, and corrosive elements will become mixed in with the moderator [43].

Controlling this requires the presence of a CVCS to clean these corrosive and dislodged

elements from the coolant, and to purify and control the level of Boron diluted in the

moderator. The operation of a CVCS and the presence of corrosive elements in the core add to

the operation and maintenance burden, and the additional piping increases the risk of loss of

coolant accidents (LOCAs) [15, 43].

Soluble boron also introduces an inadvertent boron dilution accident (BDA) risk [15,

16, 42]. While boron is seen to be uniformly mixed into the coolant, there carries a statistically

small chance that one area of the coolant becomes saturated or void of boron. As this section

of coolant passes through the core, the reactor will experience a large insertion of positive or

negative reactivity. As a result, too much positive reactivity will occasionally be added and the

core will automatically be shut down.

Lastly, altering the concentration of Boron can be adjusted for burnup, reactor

dynamics, and even for load-follow operation. However, it is too slow to compensate for

reactor kinetics, but fast enough to control reactor dynamics.

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1.1.4.2 Burnable poison materials

Large amounts of excess reactivity are undesirable because they require large amounts

of control material to be inserted into the core. With more control material in the core, the

consequences of a rapid removal of control material through either dilution accidents or

control rod ejection become more disastrous, and potentially capable of bringing the reactor to

prompt criticality [13]. As a result, limitations are placed on the amount of reactivity that can

be present in a single control rod and in a bank of control rods [62]. Thus if more reactivity

compensation is required, more control rods and control rod banks must be employed,

increasing the mechanical complexity of the system and occupying additional valuable space

within the core. All of this adds up to an additional economic impact, and should therefore be

avoided if possible.

To avoid excessive use of control rods, reactors today employ both soluble boron and

burnable poisons as additional methods of excess reactivity compensation. In eliminating

soluble boron more dependence is placed on burnable poisons and care should be taken to

select the proper type of poison for use in a small LWR.

There are generally three different types of burnable poisons with their own advantages

and disadvantages: Gadolinia Oxide (Gd2O3), Erbia Oxide (Er2O3), and Integral Fuel Burnable

Poisons (IFBA) [13, 26, 38].

Gadolinia Oxide, comprised of Gd155 and Gd157, is homogeneously mixed with UO2 to

create UO2-Gd2O3, without any alterations to the physical fuel pin dimensions. The amount of

Gd2O3 present in UO2-Gd2O3 fuel pins largely depends on the amount of reactivity

compensation necessary, and thus gives flexibility to the core designer. Gd2O3 also has a

larger absorption cross section for thermal neutrons compared to Er2O3 and IFBAs, which

correlates to a smaller number of pins necessary for excess reactivity compensation.

Furthermore, self-shielding effects in UO2-Gd2O3 pins creates excess U235 at middle of

cycle (MOC) and end of cycle (EOC), usually resulting in a decision to reduce the initial

amount of U235 in UO2-Gd2O3 pins. However, this purposely reduced enrichment (and other

degradation of material properties) creates a slightly lower thermal conductivity. In order to

ensure the maximum fuel temperature design criteria is never exceeded, a further purposeful

reduction of U235 enrichment may be necessary [13, 17, 18].

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Er2O3 is also a homogeneously mixed burnable poison, similar to Gd2O3. The chief

difference lies in the relatively small absorption cross as a primarily resonance absorber. This

requires a larger number of Er2O3 rods to suppress initial excess reactivity when compared to

Gd2O3. Similar to Gd2O3 is the reduction in thermal conductivity, and self-shielding effects,

which will again produce underburned fuel pins at MOC and EOC, requiring a reduction in

initial enrichment of U235 in UO2-Er2O3 pins.

IFBAs operate on a different design principle, placing a thin layer of Zirconium

Diboride (ZrB2) coating on the fuel pellets. This coating approach results in a longer overall

burnup of fuel assemblies employing IFBAs because there is no fuel reduction displacement

by IFBA pins [26]. As an added benefit, IFBA pins burn out completely when compared to

homogeneously mixed burnable poisons like Gd2O3 and Er2O3 since the coating leaves

essentially no residual absorption penalty. However, a significant drawback arises due to the

neutron-alpha reaction with Boron-10, in which B10 absorbs a neutron and decays via alpha

emission, producing helium. This excess helium can exert additional pressure on the cladding

boundary, and care must be taken to ensure the pressure limits are maintained [26]. This

ultimately results in a global limit on the total IFBA loading amount.

Further burnable poison arrangements include the use of lumped poisons instead of

homogeneous arrangements. The strong self-shielding characteristics of lumped poisons result

in a smooth burnup profile and a longer effective poison lifetime. However, the impact of

discrete pellets is very difficult to model. The use of such lumped poisons represents a

deviation from normal operating PWR fuel assemblies, and will not be explored in this

feasibility study.

1.2 Advantages and Disadvantages to Soluble Boron-Free Operation

Removing soluble boron from normal operations in a prototypical SMR introduces

several inherent benefits, and creates a few key challenges. Before exploring the breadth of

these benefits and issues, a brief survey of the differences between typical LWRs and SMRs is

required.

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1.2.1 Differences between Small Modular Reactors and Typical Light Water Reactors

Small Modular Reactors represent a different business model than traditional LWRs.

Since the first commercial Nuclear Power Plants (NPPs), reactor designs have steadily grown

larger and larger to take advantage of an economy of scale. Unfortunately, among other things,

the initial investment in both capital and time has grown disproportionately burdensome [45,

50]. The gigantic cost and the inability to determine when a plant would be licensed and built

brought the industry to a point where large NPPs were rarely economically feasible.

While the industry is seeing promising signs of growth, including the recent

certification of the Westinghouse AP1000, the traditional NPP business model carries some

serious roadblocks to long term commercial success [34, 40, 45, 50]. The Small Modular

Reactor (SMR) business model addresses these roadblocks and introduces a new path to

commercialization [34, 40].

The definition of SMRs depends on who you ask. In some contexts, it refers to Small to

Medium Reactors, while in others it signifies a Small Modular Reactor – one that can be built

off-site. Traditionally, the line between SMRs and typical LWRs blurs around the 300-600

MWe range [55]. Most SMRs in design today are less than 300 MWe, which is close to one

third the power output of traditional LWRs [48, 54].

For these SMRs to overcome traditional economies of scale, they employ a few specific

design goals: Create a reactor with far less prohibitive initial investments and a quicker return

on capital; Certify standard designs that could be fabricated off-site and shipped by barge or

train; Employ “Safety-by-Design” to create a passively safe reactor with less operation and

maintenance costs; and employ an economy of multiples instead of an economy of scale [47].

In order to accomplish these goals, a major design simplification must occur. SMRs

adopt standard PWR technology and condense the entire primary loop to a single containment

vessel. The reactor core, control ride drive mechanisms, steam generator, pressurizer, and

reactor coolant pumps are housed in a single cylindrical shell [45]. The only external elements

in some designs include pressurized valves for emergency core cooling system (ECCS)

mechanisms and the secondary loop running from the steam generator to the turbine and

condensers. This simplification makes several of these goals possible. First, the simplified

design will, once certified, enable vendors to certify and construct the reactor itself off-site,

vastly reducing the construction and regulatory burden of typical LWRs. Additionally, the

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simplified design features several distinct safety advantages that can be engineered to become

passively safe.

First, incorporating all the primary circuit elements into one containment vessel

eliminates the large connecting loop of piping between component pressure vessels and the

steam generators, eliminating LOCAs as design-basis events. Second, integrating the steam

generator inside containment allows for some revolutionary designs that are capable of

accommodating thermal expansion without excessive mechanical stress and with a high

resistance to flow induced vibrations. Third, incorporating the reactor coolant pumps within

containment eliminates the chance of leakage. Fourth, the pressurizer carries a potentially

larger volume-to-power ratio and can potentially eliminate the need for pressurizer sprays.

And finally, inserting the CRDM into the containment vessel eliminates the potential for an

inadvertent rod ejection accident, and reduces the number of penetrations in the vessel head.

Together, these advantages significantly reduce the manufacture and installation costs [45].

This is by no means a comprehensive list of advantages, but the cursory list

demonstrates how a revolutionary simplification can bring several unique safety advantages.

SMRs in design today incorporate a “safety-by-design” approach, where the underlying

principle is that potential accidents should be intrinsically eliminated by design, rather than

coping with their consequences through safety systems. The remaining inescapable accident

scenarios can be dealt with through passive safety systems in part due to the lower power

density and smaller core volume. Designs in certification today boast a much smaller core

damage frequency (CDF) and large early release frequency (LERF), potentially reducing the

off-site emergency planning zone [31, 44, 45, 47].

1.2.2 Advantages of Soluble Boron-Free Operation in Small Modular Reactors

All of the above advantages are accomplished by stringent design simplification. Any

additional piping, pumps, and moving parts carry maintenance and operation implications,

along with additional safety and regulatory hurdles. Returning to the initial discussion on the

advantages and disadvantages of running a soluble boron-free SMR, the biggest advantage is

realized in the elimination of the CVCS and any purification systems from normal operation.

The elimination of this additional piping and of operational oversight bring a significant

economic and safety benefit.

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While most designs that incorporate soluble-boron free operation still retain boric

solutions in accumulator tanks or other Emergency Core Cooling System (ECCS) functions

[45], their elimination from normal operation still significantly reduces the operations cost.

Consider a scenario where multiple SMR units are bundled together at a single plant with just

a few reactor operators. With each reactor running a different concentration of boron at

different power levels, the potential for confusion appears to be high. Running soluble boron-

free will, at the least, allow a smaller team of reactor operators to oversee multiple units safely

and effectively.

Furthermore, the elimination of corrosive effects from boron, and problems linked to

waste removal that have periodically plagued the industry represent another significant

advantage [11, 15]. Corrosive elements that find themselves in the coolant are easily activated

in the high flux environment, and represent an additional dose to reactor personnel that would

be avoided with soluble boron-free operation.

Other advantages are realized in the safety aspects of operation. Boron Dilution

Accidents are completely eliminated and any potential loss of coolant accident will not be

affected by the loss of soluble boron. Removing boron also creates a stronger negative

moderator temperature coefficient due to density differences between pure water and a boric-

water solution [43]. In typical LWR operations, the presence of soluble boron is accounted for

in the neutron economy, and the density of a boric-water solution is slightly increased from a

pure water solution. In an accident scenario, the overall density of the moderator is what

drives the negative MTC. By removing boron, the density is automatically reduced, creating a

more negative MTC.

Along the same lines, some typical LWRs have a positive MTC at BOC, owing

partially to a stronger boric solution at BOC. In this scenario, the moderator density at BOC is

too high, creating non ideal conditions for reactivity, where a decrease in density enhances the

thermalizing effect of the moderator. This of course has implications for safety and regulation

that must be sufficiently dealt with, and removing boron completely eliminates this potential.

In sum, the various advantages offered by boron-free operation help create a safer, more

reliable SMR. Eliminating pumps, piping, overpressure transients, boron dilution accidents,

and introducing a safer MTC all carry strong benefits that significantly improve the ability to

create a passively safe reactor [15, 43].

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1.2.3 Disadvantages to Soluble Boron-Free Operation in Small Modular Reactors

For all its benefits, boron-free operation is not without disadvantages. Removing

soluble boron as one of the three main methods of reactivity compensation fundamentally

changes normal operating procedure. Typical LWRs use soluble boron to reduce the excess

reactivity to levels manageable through limited control rod involvement. So while all reactors

employ control rods to handle daily reactor kinetics, soluble-boron allows these control rod

movements to be limited to the very top portion of the reactor. In this manner, the neutron flux

profile is minimally affected, and does not produce an undesirable axial power profile.

Without soluble boron, control rods must compensate for any excess reactivity left

from the burnable poisons. This requires their direct and significant involvement in daily

operations, where the active control rod bank at BOC is almost completely inserted, and is

slowly withdrawn as the core depletes. This effect creates a skewed axial power profile for the

lifetime of the core. Left unaddressed, this will create adverse pin-peaking factors and

ultimately lower the reactor's operating margin [24, 37].

It must be noted that the overall impact of peaking factors can be reduced by lowering

the overall power density of the core, and suggests that smaller reactors stand to benefit more

from boron-free operation since they are better suited for small power densities that blunt the

impact any adverse axial power profile may have.

Nevertheless, significant engineering effort must be given to maintain a proper axial

power profile. While there a few useful techniques to achieve this, it is still a cost-intensive

exercise and leaves less control for operators to use in normal operations.

The most obvious solution to the axial power profile issue is to attempt to mimic the

effect of soluble-boron on the neutron flux. That is to say, design the discrete neutron poisons

in such a manner as to mimic the effect of a unified neutron absorber. In this manner, the

overall axial and radial flux profile over the life of the core will remain as smooth as possible

and thereby minimize any pin-peaking issues. With only burnable poisons and control rods as

viable methods to control excess reactivity, there are four main techniques that can be used to

accomplish this.

First, any burnable absorber arrangement can be axially graded. Higher enriched

Gd2O3 at the bottom of the fuel pins, in the areas that will first be exposed to higher neutron

flux concentrations, can blunt the effect of control rod movement. Second, separating the

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active control rods into two or more control rod banks that operate at different depths can

serve to offer a step reduction in reactivity compensation, instead of the sudden cliff between

axially rodded and unrodded locations. If different control rod materials are used for the

different banks, a further step reduction can be achieved. Third, lowering the enriched U235 in

the fuel pins that contain burnable poisons will compensate for any shadowing and shielding

effects. Finally, axially grading the enrichment of U235 for entire fuel assemblies can adjust the

amount of reactivity present at desired locations.

One technique by itself might not be enough to completely overcome the axial power

profile issue, but employing all four in conjunction could potentially create a suitable axial

power profile throughout the lifetime of the core. The difficulty arises by the fact that none of

these methods are independent variables. Their effect on the axial neutron flux profile will

also affect the impact of other techniques on the flux profile. Any single manipulation of the

neutron flux will ultimately change the effectiveness and overall impact of other methods of

controlling the neutron flux. Thus, any optimization study would be exceedingly difficult.

Other disadvantages to soluble boron-free operation carry safety implications. Any

rod ejection, rod withdrawal, or stuck rod event can be much more severe due to the additional

control rod worth [26, 43]. Furthermore, any refueling activity must be carefully analyzed due

to increased criticality concerns. Without soluble boron, depleted fuel assemblies in cold zero

power conditions carry a much lower criticality margin. Adding soluble boron for these

activities might be prudent.

Finally, because control rods are a discrete rather than uniform absorber, any

shadowing effects caused by the insertion or removal of control rods will have a greater

propensity to induce xenon oscillations. Since boron-free cores use active control rods, care

must be taken to prevent these events.

Overall, the removal of soluble boron carries significant advantages toward the safety

and reliability of reactor operations. But its removal also brings distinct challenges, most

notably in controlling the axial power profile. A complete discussion on the exact nature of

these challenges will be provided later, along with an examination of potential strategies that

could mitigate the challenges.

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Chapter 2 – Literature Review

2.1 Survey of Current SMR Designs

This thesis concerns soluble-boron free operation in Small Modular Reactors. The

state of the industry today involves several competing designs, some of which employ boron-

free operation. The motivations for moving to boron-free have been previously discussed, and

this thesis aims to further inform any decision to move to soluble-boron free based specifically

on core size and power density. With this in mind, a brief survey of the three main SMRs

being designed in the United States is in order.

2.1.1 Babcock and Wilcox mPower

The Babcock and Wilcox (B&W) mPower reactor design [21] is a passively safe

advanced light water reactor with a below-ground containment structure. Employing a

competitive approach to plant operations that emphasizes safety, the mPower reactor will be a

180 MWe reactor with a passive safety that eliminates emergency power requirements,

incorporates a 4-year core lifetime with standard U235 fuel, and a 60-year plant lifetime with

spent fuel storage on-site.

The mPower reactor is a descendant of the B&W maritime reactor program, notably

incorporating four key features of the nuclear-powered merchant ship Otto Hahn:

incorporating all NSSS components within a single vessel, use of an integral, once-through

steam generator, use of PWR-type fuel assemblies, and boron-free reactor coolant. The

mPower design also improves upon the Otto Hahn design by introducing a higher reactor

power and an improved efficiency, placing control rod drive mechanisms within the single

containment vessel, and incorporating passive safety systems [21].

Notable features of the core design include a 48-month operating cycle at 95%

capacity with shorter versions of standard commercial 17 x 17 PWR fuel assemblies in a

closely packed square-pitch lattice. A significantly reduced average linear power density

(compared to commercial PWRs) results in improved thermal margins, increased operational

flexibility and longer fuel cycles. The non-borated coolant necessitates use of several different

control rod banks which control excess reactivity and axial power shape. Several reactor

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coolant pumps supply forced convection through the primary circuit, with a standard

electrically-heated pressurizer above the steam generator.

Notable differences in mPower’s design compared to NuScale and Westinghouse

designs include the use of boron-free coolant, a below-ground containment structure, 69

assemblies for 180 MWe operation, and a 4-year core lifetime with no refueling. Most other

aspects are largely similar in design, with an integral containment vessel that allows for typical

SMR advantages like advanced passive safety features and modular, scalable designs.

While B&W is designed for boron-free operation, information pertaining to the

operation and effectiveness of their boron-free reactor is strictly proprietary. The only public

knowledge of their current design is simply that it is boron-free, but nothing further can be

said of the strategies and designs used to create a suitable boron-free reactor.

2.1.2 NuScale Power SMR

The NuScale Plant represents an innovative approach to SMR design by introducing a

scalable plant comprised of up to 12 factory-fabricated 45 MWe power modules. Each module

consists of an integrated PWR surrounded by a second, high strength containment vessel. Each

vessel shares a common concrete pool that resides underground, housed in a seismic category

I building, which provides 30 days of passive core and containment cooling. After 30 days, the

core decay heat generation is small enough for natural convection heat transfer to provide

sufficient cooling for an unlimited period [31].

This unique design represents superior passive safety, providing decay heat removal for

an indefinite period of time without the need for external power or water. Owing to each

module’s 45 MWe power output, a smaller integrated PWR vessel with a core comprised of

37 half-height standard 17 x 17 assemblies operates on natural convection, further eliminating

the need for external power. A helicoil steam generator optimized for natural circulation

provides heat removal from the primary cicuit, and an integral pressurizer with heating

elements and a spray system maintains the pressure at 1850 psia. Each module operates on a

2-year refueling cycle.

The smaller core with a relatively lower power density and flow rate make NuScale

stand out from B&W and Westinghouse. The use of a common pool and a scalable plant

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further distinguished their design. However at present their design incorporates soluble boron

as a primary method of excess reactivity compensation.

2.1.3 Westinghouse SMR

Westinghouse’s Small Modular Reactor incorporates proven design technologies

realized in the AP1000 plant to create a passively safe integral pressurized water reactor.

Similar to B&W and NuScale, the integral reactor containment sits below grade and houses all

elements of the primary loop, including a once-through steam generator and integral

pressurizer. The reactor is designed for >225 MWe operation by incorporating 89 robust 17 x

17 8.0 ft active height PWR fuel assemblies. This larger size sets the Westinghouse design

apart from both B&W and NuScale, offering the greatest energy output with a 2 year refueling

cycle.

Westinghouse’s proven ability to design, license and deploy reactors and the

experience gained through the design and certification of the AP1000 plant lends credibility to

their SMR design. Some of these AP1000 features enable a passively safe design that allows

for 7 days of passive core heat removal before human intervention would be required. This

exceeds the current NRC regulations requiring 72 hours of passive safety, but falls short of

both B&W and NuScale, owing to the larger core and greater power output. This larger design

necessitates extra complexity in plant operation and safety systems, and reflected in this is the

use of borated coolant through the primary loop.

Of specific concern for this thesis the core size and power density of each design. As

B&W, with a moderate size and power density being the only design that has pursued boron-

free operation, perhaps other larger or smaller designs would be well suited to revisit a boron-

free approach. Nevertheless this thesis employs a SMR design with a power density roughly in

the middle of these three designs in an effort to provide research on a typical, universal SMR

design.

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2.2 Relevant Soluble Boron-Free Research and Development

While some current SMR designs employ a boron-free core design, the information

related to their specific design and operation are kept strictly proprietary. There are very few

publicly available research papers and relevant reactor designs on soluble boron-free

operations in LWRs. Nevertheless, a handful of notable and significant papers and their

contributions to boron-free research are outlined and discussed below.

2.2.1 Feasibility Studies of a Soluble Boron-Free 900-MWe PWR

In 1999 the French Commissariat a l’Energie Atomique conducted a feasibility study on

an Advanced 900-MWe PWR aiming at the partial or total elimination of soluble boron during

normal operations [12, 15, 37]. Their study comprised three parts: consequences of the partial

or total elimination of soluble boron on plant safety; core physics including assembly design

and core control; and core physics including control rod follow and load following. Their

motivations for the study involve several factors previously discussed in the introduction, with

a specific eye on two main objectives: the improved safety taking into account the principle of

defense in depth, and an increased simplification in the design and control.

The first part concerns the safety systems and the consequences of eliminating or

reducing soluble boron. The implications linked to the use of soluble boron in the coolant are

described, as well as the consequences for the reactor in terms of demands for reactivity

control reinforcement and for the need for defense-in-depth requirements [15]. As described,

the greater the elimination of soluble boron, the greater the simplifications. All this makes

operation easier (reduction or elimination of maintenance), reduces the doses received by

maintenance staff (less piping in contact with coolant), simplifies accident transients, reduces

the risk of human errors, and reduces maintenance costs.

The second part details the various neutronic consequences of eliminating boron,

including increased dependence on neutron poisons, moderation ratio, and cluster systems for

control rods [37]. A specific assembly geometry is optimized by taking these consequences

into account, where it was found that a 19x19 assembly lattice with 36 poisoned rods could

sufficiently suppress excess reactivity. Gd2O3 was selected due to its strong absorption

characteristics, with 16 rods at 5% and 20 rods at 14%. Selecting such a high loading

percentage for Gd2O3 introduces a longer burnup period for Gd2O3 and stronger self-shielding

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characteristic, at the expense of slightly higher peaking values. Careful selection of the loading

geometry optimized the assembly’s power peaking factors, maintaining a satisfactory value of

1.16 at the beginning of cycle and 1.07 at the end of cycle. During the core design, further care

was taken to select a proper loading pattern for a three-batch refueling scheme, and to

optimize the Rod Control Cluster (RCC) arrangement.

Several important design modifications arose as part of this first core physics study: A

19x19 lattice was designed to accept an increased number of absorber rods, and to increase the

moderator-to-fuel ratio. Further axial zoning of the burnable poisons improved the axial power

profile, and multiple control rod banks provide sufficient reactivity to ensure hot and cold

shutdown.

The last core physics study addressed control algorithms to define control rod

movements so as to minimize the imposed power peaks at each instant [12]. These peaks are

the inevitable result of primarily compensating for excess reactivity through control rods.

Further optimization of the axially graded burnable poison profile, along with introducing

both grey and black control rod clusters, allowed for a smoother power profile over the whole

cycle. These specific strategies mirror what was discussed earlier in this study. Additionally,

such a dependence on control rods increases the consequences of reactivity-induced accidents

linked to accidental removal of rod clusters and necessitated further study on the associated

safety implications.

Final conclusions determined that soluble-boron free operation in a 900-MWe PWR

significantly simplified the core control and improved operational flexibility. However,

soluble-boron free operation creates a specific difficulty in properly controlling the power

distribution at the end of cycle and during load follow operations [12].

Since the Commissariat a l’Energie Atomique directed their study on the effects of

removing soluble boron on a large 900-MWe reactor, their findings were concerned with all

aspects of operation. SMRs reduce and simplify the traditional PWR layout to a single

containment, creating several distinct differences that in turn impact the benefits and

advantages to removing soluble boron. With this in mind, much of work performed by the

Commissariat does not translate directly to SMRs. While many of their operating

characteristics – like an increased dependence on burnable poisons and additional control rods

with multiple banks – will be employed and expanded in this thesis, other aspects will be of no

concern due to this distinct difference between traditional PWRs and SMRs.

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2.2.2 Elimination of Soluble-Boron for a New PWR Design

The Combustion Engineering study on soluble-boron free feasibility [43] was

motivated by two main factors: the corrosion effects from boric acid, and the large

contribution on the effluent volume. With these two objectives in mind, the methodology

employed four steps: identification of the needs for reactivity control, lattice effects, new

poisons and increased use of burnable poisons, and safety and economic analysis within an 18

month cycle.

Their results covered soluble-boron free operation with commonly used technologies

and standard lattices and poisons, while doubling the current number of control rods compared

to standard PWRs. They also found improved performance in terms of safety and an

equivalent cost when optimization is performed. However soluble boron free operation was

attained at the cost of restrictions on the cycle length and on the operating margin due to

peaking factors.

In the end, EPRI concluded that eliminating soluble boron would allow for a greater

simplification in control and maintenance through the elimination of pipes and circuits and to

reducing several waste management activities. Finally, removing the corrosion effects and

eliminating problems linked to overpressure transients are reflected in safety improvements.

Their conclusions found that the few drawbacks linked to boron-free operation can be reduced

through optimization and are less restrictive for smaller PWRs. They additionally concluded

that the advantages are particularly beneficial for passive small and medium reactors [43].

Where the EPRI study ends is where this study begins. They perform their analysis

with respect to traditional LWRs, but find smaller designs might be better suited for soluble

boron-free operation. Many of their findings are reiterated in the advantages and

disadvantages outlined earlier, but unfortunately the combustion engineering study does not

contribute significantly to specific strategies for overcoming difficulties in operations.

2.2.3 A Soluble Boron-Free Core Design for the IRIS-50

The IRIS-50 was a prototypical design under development by Westinghouse as a 50

MWe integral PWR, based on the well-known 335 MWe IRIS design [16]. The larger 335

MWe IRIS design incorporates soluble boron in the coolant, in large part because additional

control rod requirements would become economically burdensome [7]. However in smaller

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designs like that of the IRIS-50 a soluble-boron free design could become economical. This

study shows that control rod banks can be effectively used as an alternative to soluble boron

for both long term and short term reactivity compensation in all plant operating conditions.

Main features of the IRIS-50 include 37 fuel assemblies with a single batch, zoned fuel

management arrangement. The IRIS-50 incorporates the use of 6.0 ft standard 17 x 17

Westinghouse PWR fuel assemblies with UO2 fuel for a 4 year cycle length. Er2O3 acts as an

integral burnable absorber for further reactivity compensation [16]. The smaller core leads to

an increase in neutron leakage, and therefore a less reactive configuration. However, this also

introduces tighter coupling of the core, reducing the impact of localized events like control rod

insertion. This adds to the viability of soluble boron-free operation due to an increased

dependence on control rods.

To demonstrate that control rod banks can be effectively used as an alternative to

soluble boron, multiple control rod banks are selected for different purposes. Four banks of

rodded assemblies function as primary reactivity control banks. A separate bank exists

independently and functions to balance the axial power distribution. Two further banks

provide shutdown margin for hot and cold conditions.

The Four primary reactivity control rod banks are moved to compensate for reactor

kinetics and to maintain criticality. Two insertion patterns for the different banks are proposed

to ensure that different depths of insertion for each bank effectively balance any shadowing

and shielding effects from protracted insertion of a control rod in a given fuel assembly. As

the fuel is depleted, the two configurations are periodically alternated. Further optimization

incorporates the axial offset bank to counterbalance the effect on axial power of the partial

insertion of the primary reactivity control rod banks [16].

Altogether, a functional scheme for reactivity compensation in a small PWR is

proposed and analyzed. The results demonstrate a 4-year effective cycle length that possesses

higher relative power peaks that are still within all design limits. Further optimization of fuel

loading patter and control rod design is expected to further reduce the associated power peaks.

While this IRIS-50 design did not explicitly incorporate advanced burnable poison

schemes, the selection of multiple control rod banks demonstrates the feasibility of depending

heavily on control rods to compensate for excess reactivity. It is important to note that the

IRIS-50 control rod algorithm incorporated multiple banks that are each partially inserted in

the core. Unfortunately, complete information on the axial power profile, the neutronic

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characteristics, peaking factors, and other relevant operational data is kept proprietary. While

this thesis will adopt general strategies outlined in the IRIS-50 design, the lack of complete

core data necessitates starting from scratch and building an independent strategy for soluble

boron-free operation.

2.2.4 Nuclear and Thermal Hydraulic Design Characteristics of the SMART Core

The System-integrated Modular Advanced ReacTor (SMART) is a 330 MWth SMR in

development through the Korea Atomic Energy Research Institute (KAERI). Since its

inception in the early 2000s up to today, the design has undergone significant modifications

[1, 2, 23, 48], with early designs incorporating soluble boron-free operation. The details on the

proposed soluble boron-free operation are provided in a 2003 paper on SMART’s nuclear and

thermal hydraulic design characteristics [8].

The SMART reactor employs 57 fuel assemblies in a circular array with 17x17 fuel

assembly geometry. Fuel rods employ UO2 with 4.95% U235 for a 3-year operation cycle, with

a 2 meter active core height. Burnable poisons and control rods are used to compensate for

excess reactivity, with 49 total control rod elements present in the core. These 49 control rod

elements are also capable of maintaining a subcritical condition at 20ºC without soluble boron.

The strategy for soluble boron-free operation utilizes a combination of burnable poisons

and control rod banks. With regard to burnable poisons, three main fuel assembly types are

employed, each with different burnable poison characteristics. Specifically, one fuel assembly

type consists of 28 Al2O3-B4C shim rods, and 12 Gd2O3 poisoned rods. A second type contains

20 Al2O3-B4C shim rods and 4 Gd2O3 poisoned rods, and a third type contains 24 Al2O3-B4C

shim rods and 4 Gd2O3 poisoned rods. These three different fuel assemblies provide different

depletion profiles, and since neutron fluxes are higher in the core central region than in the

outer peripheral region, fuel assemblies with more poisons are placed in the central region of

the core. Further axial grading is also employed to compensate for control rod insertion [8],

although no detail is provided on the exact nature of the axial loading.

Control rod banks employ Ag-In-Cd and are grouped into 4 regulating banks and 2

startup banks. The startup banks are at the fully withdrawn position during power operation,

whereas the regulating banks are used in normal operation to control core excess reactivity.

The 49 control rod banks are capable of controlling core excess reactivity at all operating

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conditions [8]. Furthermore, the critical rod position of each of the 4 regulating banks during

normal operation is designed with a staggered profile. One critical rod bank is inserted far into

the core, while another is inserted slightly less. This staggered insertion limits the impact on

the axial power profile.

The critical rod position for all regulating banks does not change much during the cycle

because the core excess reactivity does not change much as a result of the careful selection

and distribution of the fuel assembly types. This relatively constant control rod position is

important for ensuring shutdown margin and power distribution control [8]. The results

obtained from the above strategies produced an axial offset between -0.20 and 0 throughout

the entire cycle, and a maximum power peaking factor of 2.05.

The strategies employed by the SMART design are similar to the strategies that are

employed in this study. The results obtained from SMART show significant promise for

acceptable soluble boron-free operation. However, once again detailed information on the

exact axial loading of burnable poisons and on control rod insertion behavior is not provided.

Information on the weight percent of B4C in the shim rods and Gd2O3 in the poisoned rods is

also not provided.

Furthermore, the SMART design employs Al2O3-B4C shim rods in addition to Gd2O3

poisoned rods. This study does not employ Al2O3-B4C shim rods in an attempt to produce

soluble boron-free operation through industry standard fuel assembly designs. Specifically,

through fuel assemblies with only UO2 fuel rods and Gd2O3 poisoned rods. It should also be

noted that each Al2O3-B4C shim rod used in the SMART design essentially creates a fully

inserted control rod with limited self-shielding characteristics. This study instead employs a

control rod algorithm that places fully inserted banks into the core for extended periods of

time.

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Chapter 3 - Methodology

3.1 Definition of research goals

SMR design incorporates several fundamental design changes. Most notably, the design

simplification into a single containment vessel and the reduced size associated with modular

designs. These simplifications bring some inherent advantages if soluble boron is removed in

normal operations. However, removing soluble boron also introduces significant

complications. Thus, this study arises from a desire to remove soluble boron in normal

operations for a prototypical SMR.

The purpose of this study is twofold: 1) Identify a soluble boron-free SMR design that

meets design requirements (to be listed below); and 2) To examine the fundamental

differences in operations with and without soluble boron in an SMR.

With respect to the first purpose, different strategies for operating boron-free will be

explored. If a core is found to meet the design requirements, no further improvements will be

attempted, since the fundamental goal of this study is to demonstrate the feasibility of boron-

free operation. In this respect, this study will not seek to define or establish an ideal core.

The second purpose of the study involves comparing the behavior of an SMR with and

without soluble boron. Key aspects include the neutron multiplication factor without leakage

effects (kinf) vs burnup, fuel depletion and plutonium production, neutron flux and energy

spectra, effective fraction of delayed neutrons, and reactivity effects (moderator and fuel

coefficients). These aspects will be examined on an infinite-lattice level as a means of

comparing the physical effects of removing boron.

3.2 Criteria for Success

Removing soluble boron places increased dependence on control rods and burnable

poisons, and requires control rods to be actively inserted in the core to maintain criticality.

This principle difference in operations directly impacts the axial power profile. In an ideal

PWR, the axial power profile will resemble a chopped cosine, with a natural peak in power at

the midplane [13]. Since a chopped cosine naturally limits any spikes or significant peaks in

power output, any deviation from this normal chopped cosine contains the potential for these

peaks, and the resultant peak will have a direct impact on peaking factors within the core.

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For this reason, the primary factor of concern in developing a soluble boron-free SMR

revolves around the maximum peaking factor throughout depletion. Of similar interest will be

the axial power profile throughout depletion, since this profile will provide insight on the

peaking factors. Strategies designed to contain the axial power profile should also be helpful

in containing the maximum peaking factors.

However, even if maximum peaking factors are at an acceptable level, a skewed axial

power profile is still less than ideal. A consistently skewed profile will result in uneven

exposure axially throughout the core, along with further complications. A power profile with a

peak that deviates from the center of the core also results in a neutron flux profile that deviates

from the center. This shifting neutron flux profile will primarily impact exposure, where

locations that experience high flux will deplete quicker. This uneven exposure throughout the

core will ultimately shorten core lifetime, representing an inefficient use of fuel in the core.

Beyond impacts on exposure, a skewed axial power profile will also produce shifting

samarium and xenon poisoning concentrations. The effect these poisons have on operation

could further complicate the axial power profile and exacerbate attempts to contain the power

profile. In the end, designing a SMR that possess a skewed axial power profile is less than

ideal.

3.2.1 Criteria for Axial Offset

As discussed above, the axial power profile in an ideal core with soluble boron closely

resembles a chopped cosine, where the core possesses inherent symmetry. The amount of

power produced above the core centerline is balanced by that produced below the core

centerline, with a natural peak occurring at the center. In order to quantify how close a core’s

power profile is from this ideal chopped cosine, a metric known as the axial “offset” is used

[26]. In general, a positive value indicates a power profile that is skewed toward the top of the

core where more power is produced above the centerline than below the centerline.

Conversely, a negative value indicates more power produced below the core centerline. An

axial offset of 0 indicates a perfect balance between power produced above centerline vs

below.

To determine the exact value of the axial offset, consider the axial power profile in

Figure 1. While the power profile still clearly resembles a chopped cosine, it has been shifted

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30

toward the bottom of the core. To calculate the axial offset value for this core, the normalized

amount of power produced in each node throughout the core is first calculated, represented by

the blue line. These values are produced by taking the averaged power level in each node and

dividing it by 25, the total number of axial nodes in the core [59]. This produces a total

percentage of power produced in each node. Then, the sum of these normalized amounts of

power is taken for all the axial nodes both above centerline and then again below centerline.

For this example, the nodes above centerline produced 18% of the total power, while the

nodes below centerline produced 82%.

Figure 1: Axial power profile of a hypothetical boron-free reactor core.

Therefore, the reported axial offset value is the difference between the total average

power produced above centerline and below centerline. In this example, the reported axial

offset would be 0.18 – 0.82 = -0.64. In this manner, the total range of axial offset values can

vary between 1 and -1. A high positive value does not necessarily equate to the locus of power

being produced at the very top of the core, just that the majority of power is being produced

somewhere throughout the top of the core. In other words, the difference between the integral

1

6

11

16

21

0 0.5 1 1.5 2 2.5 3

Axia

l Nod

e

Normalized Power Level

Normalized PowerAveraged Power

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31

of power produced above centerline and below centerline is what constitutes the value of the

axial offset.

To demonstrate this, Figure 2 shows two different axial flux profiles that both result in a

very similar axial offset value. The blue line contains an axial flux profile that more

dramatically deviates from the ideal chopped cosine, with peak power production occurring

very close to the bottom of the core.

Figure 2: Averaged axial power profile of two hypothetical boron-free cores vs core height (axial node).

While the two axial offset values are very similar, the axial power profile associated

with the -0.6 axial offset produces a maximum peaking factor much higher (5.40) than the

profile associated with the -0.64 axial offset (3.34). This is due to the higher maximum

average power level (at around node 8) of 2.75, whereas the blue line produces a peak (around

node 4) of only 2.1. The important point is to remember that the reported axial offset value is

derived from a measurement of the total amount of power produced above and below core

centerline. It does not paint a definitive picture of what the actual axial power profile is, which

will more accurately correlate to high or low peaking factors.

0

5

10

15

20

25

0 0.5 1 1.5 2 2.5 3

Axia

l Nod

e

Normalized Power Level

Axial Offset = -0.60

Axial Offset = -0.64

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32

However, since the shape of the axial flux profile will change dramatically throughout

burnup for a soluble boron-free core, the best simple representation of the axial power profile

is the axial offset value. For this reason, graphs of the axial offset value vs burnup will be used

to determine the behavior of the axial power profile throughout the lifetime of the core. But it

is important to keep in mind that it is not the axial offset itself that directly correlates to

peaking factors, but rather the shape of the actual axial power profile.

With this in mind, a successful soluble boron-free SMR will maintain the axial offset

throughout burnup at ±0.4. This band would ensure that no more than 60% of the total core

power is produced either above or below the core centerline, and would therefore represent a

largely uniform axial power profile.

3.2.2 Criteria for Maximum Pin Peaking Factors

Thermal hydraulic disciplines in nuclear engineering revolve around one critically

important factor: The reactor cannot be subject to any condition that would result in meltdown

[13, 26, 62]. Among several other potential issues, fuel failure would result hydrogen

production in the cladding, increasing the potential for hydrogen explosions within

containment and greatly increasing the risk of fission product release. Fuel melting would also

only occur in scenarios with limited heat transfer, and the resultant liquid fuel would burn

through containment and cause significant environmental damage [26].

As such, this simple requirement is of critical importance, and it carries several

implications. In order to ensure there is no fuel failure in PWRs, the NRC has identified that

the average clad temperature during any postulated accident scenario cannot exceed 2000ºF

[62]. This prevents cladding failure and the subsequent fuel melt. In order to maintain this

requirement, the NRC further requires the surface heat flux for fuel pins during any postulated

accident scenario does not fall below a specific ratio known at the Minimum Departure from

Nucleate Boiling Ratio (MDNBR) [26, 62].

The MDNBR is a ratio that defines a critical heat flux as the heat flux at which

cladding failure is likely to occur [26]. It is given as follows:

𝑀𝐷𝑁𝐵𝑅 = 𝑞𝑐𝑟𝑖𝑡′′

𝑞′′ · 𝑓

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Where 𝑞′′ represents the local maximum heat flux in a reactor core, and 𝑓 represents

engineering uncertainties. Generally, the engineering uncertainties are owed to both

overpower factors (the possibility of the reactor core operating or subject to power levels

above its rated level) and a general engineering uncertainty factor (uncertainties involved with

modeling and analyzing reactor behavior). Together, a total overpower factor of 1.05 and an

engineering uncertainty factor of 1.15 is sufficient for the purposes of this thesis [26].

The specific requirements enforce a MDNBR > 1.3 for all postulated reactor

conditions. Owing to this, thermal hydraulic demands on reactor engineers revolve around

maintaining 𝑞′′ under a specific value at which the MDNBR will be compromised.

To accomplish this, the only factor of concern would be the local maximum heat flux.

Wherever the heat flux is greatest throughout the reactor’s entire lifetime would be the heat

flux used in the MDNBR calculation. Thus, avoiding any significant spikes in power

production is critical, and sheds further light on why maintaining a proper axial power offset

(Section 3.2.1) is important. However, the axial power profile is not the specific item of

concern. Rather, the only item of concern in relation to the MDNBR is the specific maximum

pin peaking factor.

This maximum pin peaking factor occurs at the fuel pin where the heat flux is at a

maximum for the entire core. The value of the pin peaking factors are normalized to one,

therefore the value of the maximum pin peaking factor represents how far above average that

pin’s heat flux is [13, 26].

Subsequently, tracking the value of the maximum peaking factor throughout burnup

gives a quantifiable metric by which power spikes can be measured. However, requiring a

specific maximum pin peaking factor to remain below a certain level does not certify that

MDNBR limits are kept. The only value that certified MDNBR limits are kept is the specific

heat flux within the maximum fuel pin (𝑞′′). Therefore, the limits imposed on maximum pin

peaking factors will follow engineering judgment. Any final design must incorporate a

specific examination on the actual maximum heat flux inherent to that design.

Nevertheless, using engineering judgment, a pin peaking factor above a certain value

that is likely to result in a MDNBR that has been exceeded can be identified. To examine this,

first we must determine 𝑞𝑐𝑟𝑖𝑡′′ . Several methods have been postulated since the physics behind

two phase flow is exceedingly complicated [19, 20, 26]. As such, an empirical solution has not

been identified, and experimental approximations are instead employed.

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34

The selected method employs Groeneveld’s critical heat flux tables [20]. Using only

reactor pressure, mass flux, and thermodynamic quality, values for the critical heat flux in

8mm cylindrical tubes is estimated. Since these values are known, the Groenveld lookup

tables will be employed at a final determination on the value of 𝑞𝑐𝑟𝑖𝑡′′ .

By employing conservatism, the as yet unknown thermodynamic quality can be set to

-0.15 (subcooled liquid), and a 𝑞𝑐𝑟𝑖𝑡′′ value of 3335 kW/m2 is identified. Using this value, and

the above engineering uncertainties results in a total calculation of:

𝑀𝐷𝑁𝐵𝑅 =3335 𝐾𝑊/𝑚2 · 1.05 · 1.15

𝑞′′=

2762 𝐾𝑊/𝑚2

𝑞′′

Following this equation, a value of 𝑞′′ that exceeds 1973 KW/m2 will result in a

MDNBR that is below 1.4. This value will be used as the MDNBR heat flux criteria that must

not be exceeded at any point of operation.

Furthermore, from a plot of several data points correlating the maximum pin peaking

factor to the associated power density gives a general pin peaking factor of 4.2 that is likely to

result in a value of 𝑞′′ that exceeds 1973 KW/m2. Although this number was found through

correlations and engineering judgment, and will therefore be used as a guideline and not a

deterministic limit.

2.3 Available Tools for Reactor Design and Analysis

The regulatory structure of the nuclear industry requires any design and analysis of

nuclear reactors to be performed on qualified computational software [26, 62]. This feasibility

study will require analysis of lattice calculations to model the behavior of fuel assemblies with

and without soluble boron. These fuel assemblies and the appropriate cross sectional data will

further need to be packaged into full-core geometry and model the depletion of a full-scale

SMR. The software should be flexible and powerful enough to accurately simulate the

complex behavior of nuclear reactors, and must be an industry recognized standard and

verified for reactor analysis.

While there are several options available, Oregon State University provided access to

Studsvik Scandpower’s suite of neutronic codes. Their code held unique advantages through

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35

the ability to model all aspects of reactor design, from pin-cell calculations and infinite lattice

studies, to 3-D full core depletion and analysis. Further benefits include the ability to couple

other industry standard thermal hydraulic codes like RELAP5 for detailed analysis of the

entire primary circuit. While this study does not incorporate thermal hydraulic calculations,

future work may incorporate a complete analysis of the primary circuit, in which case

selection of a code that easily couples with thermal hydraulic codes is beneficial.

Studsvik’s codes are widely recognized as an industry standard, being used by utilities,

vendors, research labs, and universities in the United States and worldwide [35, 55, 59]. For

the above reasons, this code was selected for use in this study to analyze boron-free behavior

in a SMR. The specific codes utilized were CASMO – 4E and SIMULATE 3K.

CASMO – 4E is a 2-D multigroup transport theory code for calculation over the entire

burnup of LWR fuel in typical fuel assembly geometries or simple pin cells. The primary

function of CASMO is to provide neutronic and cross sectional data for cylindrical fuel rods in

a square pitch array [55]. The code contains the ability to include typical burnable poisons

homogeneously mixed in the fuel pin, which is a crucial requirement for the study at hand.

CASMO can also take spacer grids, instrument tubes, water channels, and other typical reactor

configuration.

At its core, CASMO solves the 2-D neutron transport equation for use with LWR fuel,

with the provided data simulating neutronic behavior throughout the whole exposure cycle. A

nuclear data library with 70 energy groups is coupled with the geometrical and physical

properties supplied in the input file to generate macroscopic cross sections. Resonance

integrals are approximated using an equivalence theorem and used to calculate effective

absorption and fission cross sections. Shielding and shadowing effects present with fuel and

control pins are calculated using Dancoff factors [35, 55].

CASMO also retains the ability to generate cross sectional and neutronic data suitable

for 3-D nodal codes (SIMULATE) at several possible state points. This data and the

associated cross sections are then bundled in appropriate libraries for use with SIMULATE.

Additionally, several functions are automatically performed (thermal expansion of densities

and dimensions) or have set default values for typical fuel and geometric parameters. The

Linux based code was written exclusively in Fortran 77 and runs on UNIX and Linux

workstations, along with P.C.’s.

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36

While CASMO will be used for 2-D lattice analysis and fuel assembly preparation,

SIMULATE 3K will be used for 3-D full core analysis. SIMULATE 3K is an advanced code

for the analysis of LWRs, specifically BWRs and PWRs. It employs a 2-group nodal code

based on the QPANDA neutronics model, in which a 4th order polynomial is used to represent

both thermal and fast flux distributions [35, 59].

At its core, SIMULATE performs pin power reconstruction and can be employed to

analyze fuel management, load follow, xenon and samarium transients, startup predictions,

criticality searches, and several other reactor analysis data. It is a flexible and strong code

capable of simulating the complex physical effects typical of LWRs [98]. Due to its position

as an industry standard code and the qualification process inherent to its approval from the

NRC for reactor analysis, no validation study will be performed.

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37

Chapter 4 – Reactor Design and Analysis

Owing to the organizational structure of this study, the methodology and analysis is split

into five main sections.

• First, an overview of the selected SMR design

• Second, a study on five key physical effects of soluble boron-free operation in a 2-D

infinite lattice.

• Third, development and analysis of several fuel assemblies with different neutronic

and depletion characteristics in preparation for a soluble boron-free full core design.

• Fourth, a description and analysis of different strategies for containing pin peaking

factors and axial offset in a soluble boron-free reactor core through axially grading

both burnable poisons and U235 enrichment.

In this manner, a foundation will be laid upon which the results from these different

strategies of soluble boron-free operation can be analyzed. Chapter 5 will therefore discuss

and analyze the actual results from implementing these different strategies.

4.1 The Selected SMR Design with Fuel Assembly Geometry and Characteristics

The purpose of this study is to investigate the operational and physical effects involved

with removing soluble boron in normal operations. With that in mind, an SMR design that

follows industry standards would best capture the inherent changes induced from boron-free

operation. With this in mind, the selected SMR design followed industry standards where

possible.

Table 4.1 and 4.2 contain the fuel assembly and full core geometry and specifications

for the selected core. Westinghouse PWR fuel assembly geometry was selected since they

represent an industry standard. The one significant change from normal Westinghouse fuel

assemblies is the active core height. Our SMR was designed with a 200 cm active height, in

order to represent a smaller, compact reactor core designed to fit in a single comprehensive

containment shell typical of current SMR designs.

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Fuel Temperature 824 KModerator Temperature 563KPressure 2175 PSIPower Density 68.5 kW/LAssembly Geometry 17 x 17Pin Pitch 1.26 cmFuel Composition UO2

Fuel Density 10.41 g/cm2

57% Inconel-718,43% Stainless Steel

Spacer Density 7.9 g/cm2

Spacer Mass per AxialUnit Length

Fuel Radius 0.4130 cmCladding Thickness 0.0631 cm

Inner Shroud Radius 0.57 cmShroud Thickness 0.04 cmInner Shroud Composition Moderator

Inner Shroud Radius 0.57 cmShroud Thickness 0.04 cmInner Shroud Composition Ag-In-Cd

Control Rod Geometry

Table 4.1 SMR Fuel Assembly SpecificationsFuel Assembly Specifications

Spacer Material

20.5 g/cm

Fuel Pin Geometry

Guide Tube Geometry

A total of 57 fuel assemblies

comprise the full core in a circular array

(Figure 3). This value is slightly less than

B&W mPower and Westinghouse (69 and

80 fuel assemblies, respectively), while

larger than NuScale’s SMR (37 fuel

assemblies). The selected design

incorporates 57 fuel assemblies in order to

incorporate a single central fuel assembly,

while still retaining a symmetrical circular

array.

Core power is a function of power

density, core fueled area, and active core

height. The chosen metrics provide 361.1

MWth, placing this design in the same

category as the M&W mPower and

Westinghouse SMR designs. NuScale’s

design is significantly lower, but also

operates on a different design philosophy

that incorporates natural circulation

throughout the core [31]. This selected

design provides forced convection through the primary loop in order to retain industry

standard characteristics, and to avoid particularly egregious thermal hydraulic performance

issues related to natural circulation [50]. The specific coolant mass flux is proportional to the

mass flux in the mPower design, and again represents industry averaged values. The same can

be said for the operating pressure, coolant inlet temperature, and fuel composition.

In the end, simulating the chosen design with soluble boron results in typical depletion

characteristics. This provides a good foundation to compare operating characteristics with and

without soluble boron.

Table 1: SMR Fuel Assembly Specifications

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39

Fuel Assemblies 57Active Core Height 200 cmCore Volume 5272 litersCore Fueled Area 26358 cm2

Core Loading 14.68 MTFuel Assembly Pitch 21.504 cmAxial Nodes 25Node Height 8 cmReflector Assembly 2.0% U235 in UO2

Axial Reflector Length 8 cm

Power Density 68.5 kW/LThermal Power 361.1 MWthPressure 2175 PSICoolant Mass Flux 352.3 kg/cm2·hrCoolant Temperature In 543 KRelative Power 100%Relative Flow 100%Core Inlet Temp 543 KBoron 0 ppm

Full Core GeometryTable 4.2 SMR Full Core Specifications

Full Core Operating Conditions

The initial infinite lattice study on

the physical effects of soluble boron-free

operation was conducted in CASMO to

model reactor assemblies. Each infinite

lattice was modeled using Westinghouse

PWR geometry, with design specifications

listed in Table 4.1. CASMO performs

thermal expansion calculations

automatically, so that a relatively simple

list of input cards can be used to model a

complete infinite lattice. Fuel, guide tube,

and control rod geometry is also included

in Table 4.1.

Figure 3: Full core radial geometry.

0 0 0

0 1 2 1 0

0 3 4 5 4 3 0

0 1 4 6 7 6 4 1 0

0 2 5 7 8 7 5 2 0

0 1 4 6 7 6 4 1 0

0 3 4 5 4 3 0

0 1 2 1 0

0 0 0

Radial Reflector Fuel Assembly

Table 2: SMR Full Core Specifications

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40

4.2 Physical Effects of Soluble Boron-Free Operation

A study on the physical effects of soluble boron-free operation in a 2-D infinite lattice

compared to normal operation with 2000 and 1000 ppm boron will be presented below. This

study was conducted using Studsvik’s CASMO reactor simulation software [55, 56], which

solved the 2-D transport equation in an infinite lattice [54, 55]. Each lattice was set up with

typical Westinghouse PWR geometry as outlined in section 4.1. These physical effects were

analyzed with 5.0% U235 enriched fuel assemblies.

This study encompassed five different sections:

• Infinite multiplication factor, kinf, with and without burnable poisons.

• Fuel depletion and Plutonium production

• Neutron flux and energy spectra

• Prompt neutron lifetime and effective fraction of delayed neutrons

• Reactivity effects: Fuel and Moderator Temperature Coefficients

4.2.1 Multiplication Factor with and without Burnable Poisons

In normal PWR reactor operations, soluble boron is dissolved in the coolant at specific

concentrations, providing strong neutron absorption characteristics in the moderator. All other

neutron poisons exist either in the fuel (burnable poisons) or in discrete locations (control

rods). Since boron is dissolved in the coolant, its suppressive effects on the neutron flux are

felt globally throughout the reactor, acting as a uniform suppressant, since the coolant exists in

a large volume of the reactor core.

Elimination of this suppressant will naturally increase the value of kinf. Figure 4

displays the multiplication factor, kinf, for a boron-free fuel assembly vs 1000 and 2000 ppm

boron.

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41

Figure 4: kinf vs burnup for 5.0% U235 assemblies with varying amounts of soluble boron.

As expected, kinf is linearly proportional to the boron concentration. Additional boron

suppresses the neutron flux in the core in a linearly increasing fashion. Throughout burnup,

the effects of soluble boron slowly decrease. At around 60MWd/Kg the difference between

the boron free assembly and 2000ppm boron is markedly less than at BOC. This is attributed

to the varying rates of depletion between boron and U235.

Additionally, increasing the boron concentration decreases the cycle length. The 2000

ppm assembly reached kinf = 1 at 25 MWd/Kg, which corresponds to the point at which the

reactor becomes subcritical. The boron-free core reaches kinf = 1 at 43 MWd/Kg, an increase

of 72%. However, this does not mean a boron-free core will have a longer cycle length, as the

initial excess reactivity must be compensated for in some form anyway.

A full core operating with soluble boron will exhibit a boron burnup curve where the

concentration of boron slowly decreases during burnup. Conversely, a boron-free core will

compensate for excess reactivity with burnable poisons that naturally deplete, and with control

rods than are actively removed from the core. All forms of reactivity compensation allow for a

variable amount of compensation, such that a maximum cycle length can be achieved. Thus,

any difference in actual cycle length must be attributed to other physical effects.

Figure 5 shows the multiplication factor vs burnup for a similar group of assemblies

with nominal burnable poisons. These assemblies contain 16 fuel pins poisoned with 8%

Gd2O3 weight percent, and 12 pins with 4% Gd2O3. These poisoned assemblies demonstrate

0.8

0.9

1

1.1

1.2

1.3

1.4

1.5

1.6

0 10 20 30 40 50 60

k inf

Burnup (MWd/Kg)

Boron Free

1000 ppm Boron

2000 ppm Boron

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42

the effect combining burnable poisons with soluble boron will have to be compared to a

soluble boron-free assembly.

Figure 5: kinf vs burnup for poisoned 5.0% U235 fuel assemblies with varying amounts of soluble boron.

At 2 MWd/Kg, the difference in kinf between the boron-free assembly and 1000 ppm

Boron is 0.060, and from 1000 ppm to 2000 ppm it is 0.053. When the poisons are fully

depleted, at 20 MWd/Kg, the differences are 0.072 and 0.060 respectively – an increase of

around 0.01 in kinf after the poisons are depleted. This unexpected increase arises from the

increased shielding and shadowing from the additional poisons. This shielding decreases the

effectiveness of the poisons, producing tighter coupling at BOC. Once the poisons are

depleted there is less shielding, which increases the difference in kinf between each assembly.

4.2.2 Fuel Depletion and Plutonium Production

Light water reactors fueled with enriched U235 contain two primary effects that

contribute to energy production: fission of U235 and the production and fission of Pu239 and

Pu241. While the fission of U238 from fast neutrons does occur, its contribution is negligibly

low, around 5-8%.

0.8

0.9

1

1.1

1.2

1.3

1.4

0 10 20 30 40 50 60

k inf

Burnup (MWd/Kg)

Boron Free with Poisoned Pins

1000 ppm Boron with Poisoned Pins

2000 ppm Boron with Poisoned Pins

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43

Figure 6 displays the weight percent of total fissile Plutonium (Pu239 and Pu241) as a

function of burnup. During operation, plutonium will continue to be produced due to neutron

capture in U238 and the subsequent decay chain into Pu239. Once Pu239 absorbs a neutron, it

either fissions or transmutes into Pu240. Following one more neutron absorption, Pu240 becomes

fissile Pu241.

Figure 6: Weight percent of total Plutonium (Pu239 + Pu241) vs burnup for 5.0% U235 enriched fuel assemblies with varying amounts of soluble boron.

Since Boron is a resonance absorber, its presence has little direct effect on the fast

neutron population. An examination of the U238 neutron absorption cross section (Figure 7)

shows that U238 has a pronounced resonance structure beginning at approximately 10 eV and

extending to approximately 10 KeV [26, 40]. These resonance integrals create favorable

conditions for neutron absorption in the epithermal and fast neutron spectra. Thus, the

presence of soluble boron would have no direct effect on fissile Plutonium production.

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

0 10 20 30 40 50 60

Wei

ght P

erce

nt o

f Tot

al P

luto

nium

Burnup (MWd/Kg)

2000 ppm Boron, Pu-239 + Pu-241

1000 ppm Boron, Pu-239 + Pu-241

Boron Free, Pu-239 + Pu-241

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Figure 7: U238 neutron absorption cross section (barns) vs energy (MeV).

However, soluble boron does have an indirect effect on plutonium production. Since

Soluble boron suppresses the thermal neutron flux, a higher total neutron flux is required if a

constant power density is to be achieved. Power density is directly correlated to fission events

in the core, and at BOC the only available means of fission is through thermal interactions

with U235 (neglecting the low percentage of U238 fission evens). Thus a higher overall neutron

population, reflected in a lower multiplication factor when compared to a boron-free

assembly, is achieved for a constant power density.

This higher total neutron flux primarily impacts the fast neutron flux profile, since

boron absorbs thermal neutrons. A higher fast neutron flux will lead to increased absorption in

U238 which in turn produces plutonium.

Figure 8 demonstrates how this accumulation of plutonium ultimately affects the total

fission rate balance between uranium and plutonium isotopes. Near BOC, U235 dominates

fission events, but the steady production of plutonium coupled with the depletion of uranium

ultimately results in an assembly that is driven by fission from plutonium at approximately 40

MWd/Kg. However this balance is not affected by the presence of absence of soluble boron.

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45

Figure 8: Total uranium and plutonium fission rate vs burnup in 5.0% U235 enriched fuel assemblies with varying amounts of soluble boron.

Figure 9 displays the weight percent of U235 vs burnup. There is no appreciable

difference between a soluble boron-free core and a core loaded with 2000 ppm boron. While

there is a difference, it is largely negligible due to the large total amount of U235. Thus, even

though the soluble boron-free core is subject to a slightly higher thermal flux and U235 fission

rates, this impact on the total weight percent of U235 is statistically insignificant even at 60

MWd/Kg.

0.00E+00

2.00E+10

4.00E+10

6.00E+10

8.00E+10

1.00E+11

1.20E+11

0 10 20 30 40 50 60

Fiss

ion

Rate

(Fis

sion

s / c

m3 ·

sec)

Burnup (MWD/Kg)

Uranium - 2000 ppm Boron Uranium - Boron Free

Uranium - 1000 ppm Plutonium - 1000 ppm Boron

Plutonium - 2000 ppm Boron Plutonium - Boron Free

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46

Figure 9: Weight percent of U235 vs burnup in 5.0% U235 enriched fuel assemblies with varying amounts of soluble boron.

4.2.3. Neutron Flux and Energy Spectra

The neutron flux spectrum is an important characteristic in determining the behavior of

the reactor core and understanding the isotopic composition and the contributions from

Plutonium. For the purposes of this study, a two-group model is implemented defining thermal

and fast neutrons as follows:

In order to determine the differences between operating a core with and without soluble

boron, a characterization of the total, fast and thermal neutron fluxes must be provided.

Figure 10 provides the total neutron flux required to maintain a constant power density

of 68.5 KW/L for the specified SMR. Increasing U235 enrichment would result in a decrease in

the overall flux level due to increasing U235 loading in the core. As a general rule, lowing the

amount of U235 in the core increases the necessary neutron flux level is a constant power

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

0 10 20 30 40 50 60

Wei

ght P

erce

nt B

urnu

p (M

WD/

KG)

Burnup (MWd/Kg)

2000 ppm Boron

1000 ppm Boron

Boron Free

Group Number Name Lower Boundary Upper BoundaryGroup 2 Thermal 0.0 eV 0.625 eVGroup 1 Fast 0.625 eV 10 MeV

Page 65: SBF in SMRs - MartJustinR2013

47

density is to be maintained. As Figure 10 shows, the total neutron flux steadily increases

throughout burnup, reflecting the need to compensate for steady U235 depletion.

Additionally, the total neutron flux increases with increasing levels of soluble boron.

This is a reflection of the need to overcome increased thermal absorption in soluble boron,

which limits the thermal neutron flux available for fission interactions.

Figure 10: Total neutron flux vs burnup for 5.0% U235 enriched fuel assembly.

Figure 11 displays the total fast neutron flux in the reactor core. The fast neutron flux

contains 90% of all neutrons in the core, and thus mirrors the total neutron flux, since any

thermal neutron effect is not noticeable in the total neutron flux because of the large fast

neutron population. Since boron is most notably a thermal absorber, the addition of boron only

affects the thermal neutron population. In this manner, the fast neutron spectrum mirrors the

total neutron flux.

4.0E+144.5E+145.0E+145.5E+146.0E+146.5E+147.0E+147.5E+148.0E+148.5E+149.0E+14

0 10 20 30 40 50 60

Tota

l Neu

tron

Flu

x

Burnup (MWd/Kg)

1000 ppm Boron2000 ppm BoronBoron Free

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48

Figure 11: Fast neutron flux vs burnup for 5.0% U235 enriched assemblies.

However, the thermal neutron flux is clearly impacted by the presence of boron (Figure

12). At BOC, the total thermal neutron population remains constant despite the presence of

boron. This is because nearly all fission events occur in U235, which requires thermal neutrons.

In order to maintain a constant power density, the amount of fissions must also remain

constant. However, since the presence of boron increases the initial fast neutron flux,

plutonium production increases (as described in Section 4.2.2).

Figure 12: Thermal neutron flux vs burnup for 5.0% U235 enriched assemblies.

3.0E+14

3.5E+14

4.0E+14

4.5E+14

5.0E+14

5.5E+14

6.0E+14

6.5E+14

7.0E+14

7.5E+14

0 10 20 30 40 50 60

Tota

l Fas

t Neu

tron

Flu

x

Burnup (MWd/Kg)

1000 ppm Boron

2000 ppm Boron

Boron Free

0.0E+001.0E+132.0E+133.0E+134.0E+135.0E+136.0E+137.0E+138.0E+139.0E+131.0E+14

0 10 20 30 40 50 60

Tota

l The

rmal

Neu

tron

Flu

x

Burnup (MWd/Kg)

1000 ppm Boron

2000 ppm Boron

Boron Free

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49

Plutonium production results in an increased percentage of fast neutron fission events,

due to its relatively large fast neutron fission cross section. This increase in fast neutron

fissions reduces the requirements on thermal neutron population, and results in an overall

reduction in the thermal neutron population for increasing concentrations of boron, when

compared to a boron free assembly.

However, the total thermal population gradually increases throughout depletion. This

effect is due to the steady depletion of U235, requiring higher thermal neutron population to

maintain a steady amount of fission events. Since the overall mass of U235 loading still greatly

outweighs plutonium for typical PWRs, an increase in thermal neutron flux is required to

continue to make use of the depleting U235 population.

4.2.4 Effective Fraction of Delayed Neutrons

Delayed neutrons perform an essential function in nuclear power reactors. The average

lifetime of prompt neutrons, those neutrons emitted from the fission event itself, is on the

order of milliseconds. Any impact these neutrons have on the reactor core and the

multiplication factor is therefore extremely fast. If these prompt neutrons were the only

contribution to the total neutron flux, any addition of positive reactivity, no matter how small,

would result in a transient too quick for any human or mechanical system to control. In such a

scenario, the only basis for controlling a reactor would lie in physical reactor feedback

mechanisms such as moderator and fuel temperature coefficients. In any practical sense, a

controllable nuclear reactor would be physically impossible.

Thankfully, prompt neutrons are not the only source of neutrons. Delayed neutrons are

not emitted from the fission event itself, but rather from fission fragments with varying half-

lives. The numerous radioactive elements that decay via neutron emission are typically

collected in 6 main groups based on their general half-life [13]. These groups contain elements

whose half-lives range anywhere from 10-3 seconds to almost 1 min. While this is still

relatively quick, it is on average several orders of magnitude longer than the prompt neutron

lifetime. Thus, even though only 0.65% of the overall neutron flux is comprised of these

delayed neutrons, their relatively long half-lives push the average neutron lifetime to levels

that are manageable for both human and mechanical control.

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50

In this manner, an investigation on the impact boron-free operation has on the fraction

of delayed neutrons and the average neutron lifetime is crucial. Figure 13 shows the fraction

of delayed neutrons vs burnup.

Figure 13: Effective delayed neutron yield vs burnup for 5.0% U235 fuel assemblies.

As can be seen, the elimination or addition of boron has no appreciable effect on

delayed neutron contributions. Different fertile isotopes have different fission product yields,

and these fission products result in different contributions of delayed neutrons. Nevertheless,

the increase in plutonium production (Section 4.2.2) and the resultant increase in fast fission

events in plutonium for fuel assemblies with soluble boron does not result in any measurable

different in the total effective delayed neutron yield.

4.2.5 Reactivity Feedback Mechanisms

Several reactor parameters that determine the reactivity of a reactor are also functions of

temperature [13]. Of most significance is the effect that fuel and moderator temperature have

on reactivity, as any increase or decrease in fuel and moderator temperature will naturally

follow any increase or decrease in reactor power. Such temperature effects on reactivity must

be defined due to their significant contribution toward the inherent stability of the reactor.

0

0.001

0.002

0.003

0.004

0.005

0.006

0.007

0.008

0 10 20 30 40 50 60

Effe

ctiv

e De

laye

d N

eutr

on Y

ield

Burnup (MWd/Kg)

2000 ppm Boron

1000 ppm Boron

Boron Free

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51

All coefficients are defined by the simple relation:

𝛼 =𝑑𝜌𝑑𝑇

where 𝛼 represents the feedback coefficient. As defined, the simple derivative of reactivity

divided by the change in temperature for fuel, moderator, etc, defines the temperature

coefficient of the reactor at that state point. It follows that, if 𝛼 is positive, any increase in

temperature will result in a further increase in reactivity through the temperature coefficient.

This increase in reactivity further increases the temperature, and the reactor power

exponentially increases until some other mechanism stops the process. Conversely, if 𝛼 is

negative, any increase in reactivity will result in a subsequent decrease in reactivity through

the temperature coefficient, and the reactor will naturally stop increasing through physical

effects alone.

In this manner, the inherent stability of the reactor is largely defined by these

temperature coefficients. The NRC recognizes the importance of these inherent stability

factors and will not license any reactor with a positive fuel or moderator temperature

coefficient in all conceivable reactor state points [25].

There are two main reactor feedback coefficients of primary concern for PWRs: Fuel

temperature coefficient, moderator temperature coefficient, and void coefficient. Each fuel

assembly was sampled at a chosen state point. For the purposes of this thesis, three state

points comprise the reactor conditions of most interest: At full power and normal operating

conditions, during startup, and at cold shutdown. These three conditions cover the range of

reactor conditions in which a transient is most likely to occur. The relevant fuel and moderator

temperatures for each condition are given below:

Average Moderator Average Fuel

Temperature (K) Temperature (K)

Hot Full Power 563 824

Cold Full Power 293 824

Cold Zero Power 293 293

Reactor State Point

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52

Calculating both MTC and FTC requires a simple ratio:

𝑅𝐹𝑀(𝑑𝑒𝑝𝑙𝑒𝑡𝑖𝑜𝑛) = 𝑘0𝑑𝑒𝑝

0 − 𝑘1𝑇0 − 𝑇1

Where the Reactor Feedback Mechanism value (RFM) as a function of depletion is

equal to a ratio of the difference in the multiplication factor at the initial state point

temperatures (𝑘0) and a slightly higher state point temperature (𝑘1), and the difference in the

actual initial state point temperatures (𝑇0 and 𝑇1).

For example, consider the Moderator Temperature Coefficient (MTC) at BOC and with

hot full power conditions. The MTC value would therefore be:

𝑀𝑇𝐶(0 𝑀𝑊𝑑/𝐾𝑔) =𝑘563 𝐾 𝑓𝑢𝑒𝑙 𝑡𝑒𝑚𝑝0 𝑀𝑊𝑑/𝐾𝑔 − 𝑘583 𝐾 𝑓𝑢𝑒𝑙 𝑡𝑒𝑚𝑝

0 𝑀𝑊𝑑/𝐾𝑔

563 𝐾 − 583 𝐾

Appropriately, the units for such a calculation are reflected as a change in the

multiplication factor per degree Kelvin (𝛿𝑘𝑖𝑛𝑓𝐾

). However traditional MTC and Fuel

Temperature Coefficients (FTC) are expressed in units of reactivity, 𝜌 [13] (where 𝜌 = 𝑘−1𝑘

).

In order to convert the current units 𝛿𝑘𝑖𝑛𝑓𝐾

to the traditional 𝛿𝜌𝐾

, the following operation is

performed:

𝑀𝑇𝐶(0 𝑀𝑊𝑑/𝐾𝑔) =

𝑘563 𝐾 𝑓𝑢𝑒𝑙 𝑡𝑒𝑚𝑝0 𝑀𝑊𝑑/𝐾𝑔 − 1

𝑘563 𝐾 𝑓𝑢𝑒𝑙 𝑡𝑒𝑚𝑝0 𝑀𝑊𝑑/𝐾𝑔 −

𝑘583 𝐾 𝑓𝑢𝑒𝑙 𝑡𝑒𝑚𝑝0𝑀𝑊𝑑 𝐾𝑔⁄ − 1

𝑘583 𝐾 𝑓𝑢𝑒𝑙 𝑡𝑒𝑚𝑝0𝑀𝑊𝑑 𝐾𝑔⁄

563 𝐾 − 583 𝐾

4.2.5.1 Fuel temperature coefficient

The most important feedback mechanism concerns the fuel temperature coefficient

(FTC). The reactor fuel temperature will be first to respond to any increase in power since

there is no need for any heat removal effects to take place before the fuel increases in

temperature. The fission events occur in the fuel itself, so any increase in power almost

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53

instantaneously increases the fuel temperature as well. Thus, if the fuel temperature coefficient

is positive, the feedback loop will be inherently fast and lead to greater instability. For this

reason, a careful examination of the fuel temperature coefficient in boron-free reactors must

be performed.

Figure 14 demonstrates the fuel temperature coefficients vs burnup for each of the three

state point conditions, both with and without soluble boron.

Figure 14: Fuel temperature coefficient vs burnup for hot full power, cold full power, and cold zero power with and without soluble boron.

Generally speaking, the behavior of the fuel temperature coefficient reflects the impact

of resonance absorption in U238, and the Doppler broadening of the resonances with increases

in temperature. Additionally, the increasing presence of Plutonium and its unique cross section

and resonance characteristics produce variations in the value of the FTC throughout burnup.

To explain the behavior of the FTC in relation to boron concentration, it is important to

note that the presence of soluble boron results in an increased fast thermal neutron flux. As the

temperature of the fuel is increased, so too is the resonance absorption cross section for U238.

Fast neutrons which require no thermalization are absorbed in this resonance absorption cross

-4.0E-05

-2.0E-05

0.0E+00

2.0E-05

4.0E-05

6.0E-05

8.0E-05

0 10 20 30 40 50 60

Fuel

Tem

pera

ture

Coe

ffic

ient

(δρ/

K)

Burnup (MWd/Kg) Hot Full Power - 2000 ppm Boron Hot Full Power - Boron FreeCold Zero Power - 2000 ppm Boron Cold Zero Power - Boron FreeCold Full Power - Boron Free Cold Full Power - 2000 ppm Boron

Page 72: SBF in SMRs - MartJustinR2013

54

section, and thus a larger fast neutron population will result in a more positive FTC. This

primary effect produces the more negative FTC with the removal of soluble boron.

Figure 14 shows that a fuel assembly with soluble boron possesses a positive FTC

during cold full power, a possible condition at reactor startup. This creates inherent safety

risks and a full safety analysis report would be required to exhaustively investigate this effect.

However, the removal of soluble boron not only decreases the FTC in all selected reactor state

points, but produces a negative FTC at cold full power.

Additionally, while the FTC does become positive as burnup progresses due to the

accumulation of plutonium in the core, soluble boron-free fuel assemblies do not become

positive until 45 MWd/Kg, at which point the multiplication is below 1, and is therefore a

condition that is unlikely to arise.

4.2.5.2 Moderator temperature coefficient

The second feedback mechanism of significance is the MTC. While the FTC provides

the fastest feedback mechanism due to its close proximity to the fission events, the MTC also

plays an important role due to its necessary moderation capabilities. The feedback loop

associated with the MTC will be slower than the FTC due to the required heat transfer from

fuel to coolant before any reactivity effect will materialize.

Figure 15 demonstrates the MTC for the above three state points with varying amounts

of soluble boron.

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55

Figure 15: Moderator temperature coefficient for hot full power, cold full power, and cold zero power with and without soluble boron.

As can be seen, a decrease in soluble boron results in a stronger negative MTC during

hot full power, increasing the inherent stability of the reactor. This effect can be partly

attributed to the density differences resulting from the addition of boron. Since boron is a

strong neutron absorber, and since the presence of boron in the moderator takes away space

that would be occupied by a strong neutron moderator (H2O), any addition of boron results in

a decrease in moderation potential. But beyond that simple effect, temperature and density are

inversely proportional, and any decrease in moderator density by definition reduces the

amount of moderator atoms in a given volume. This decrease fundamentally impacts the

ability to moderate neutrons, and results in a lower resonance escape probability, and therefore

a decrease in the multiplication factor. This effect is shown in the negative MTC.

Figure 15 shows how the MTC at BOC for a fuel assembly with soluble boron is

slightly positive at hot full power conditions. This condition is very likely, since reactors

generally operate at full power to enhance efficiency, and the positive MTC would require

extensive safety analysis. Thus, removing soluble boron not only increases the inherent

-6.0E-04

-4.0E-04

-2.0E-04

0.0E+00

2.0E-04

4.0E-04

6.0E-04

0 10 20 30 40 50 60

Mod

erat

or T

empe

ratu

re C

oeff

icie

nt (δ

ρ/K)

Burnup (MWd/Kg) Hot Full Power - 2000 ppm Boron Hot Full Power - Boron FreeCold Zero Power - 2000 ppm Boron Cold Zero Power - Boron FreeCold Full Power - 2000 ppm Boron Cold Full Power - Boron Free

Page 74: SBF in SMRs - MartJustinR2013

56

stability of the reactor at BOC and for the other selected reactor state points, but also prevents

a possibly exhaustive and expensive safety analysis associated with the positive MTC.

4.2.6 Conclusion

Impacting any aspect of operation in a nuclear reactor will affect several other variables

due to the inherently complex physical mechanisms involved. Something as seemingly

innocuous as removing soluble boron from the coolant was found to carry significant

implications on several key parameters. While this was not a comprehensive evaluation on all

the aspects impacted by soluble boron-free operation, a few effects with significant safety

implications were confirmed.

Most notably, removing soluble boron was found to harden the neutron spectrum in

the reactor core. A hardened spectrum results in increased neutron absorption in U238, leading

to greater quantities of plutonium. While some reactors are designed to produce plutonium as

a way to increase the core lifetime, plutonium production in SMRs carries significant safety

implications.

The fuel temperature reactivity coefficient was found to be directly impacted by

plutonium production due to its increased resonance absorption capabilities. Any increase in

plutonium fundamentally increases the FTC, reducing the inherent stability of the reactor. In

fact, removing soluble boron changed a previously positive FTC for cold full power

conditions to a negative value. This dramatic reduction would not only increase inherent

safety of the reactor during startup scenarios, but it would also carry the potential of

eliminating exhaustive and expensive safety analysis reports.

Similar to the fuel temperature coefficient, removing soluble boron was found to

fundamentally reduce the moderator temperature coefficient. This also carries significant

safety implications, and is identified as one of the primary motivations for removing soluble

boron in normal operations.

In the end, while some physical effects remain unchanged by the removal of soluble

boron, several key factors were found to be beneficially impacted. While this study is not

exhaustive, the above findings help confirm motivations for soluble boron free operation.

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57

4.3 Development and Analysis of Fuel Assemblies for use in Full Core Environment

The development and analysis of fuel assemblies for use in a full core environment was

conducted in CASMO-4E. Technically CASMO models an infinite lattice that contains a 17 x

17 grid of fuel assemblies with specifications listed in section 4.1. CASMO then solves the 2-

D neutron transport equation and provides detailed data on neutron behavior, generates cross

sections for every conceivable reactor state point, and returns the eigenvalue solution for each

depletion state point, among other things [57]. This data can then be supplied to SIMULATE-

3K and be used as the basis for reactor fuel assemblies in a full core environment.

In the soluble boron-free core the unique requirements on burnable poisons and control

rods for reactivity suppression necessitate the need for a comprehensive search to find ideal

burnable poison and control rod placements. The initial phase of this study must keep three

things in mind:

• First, initial ideas for soluble-boron free operation include complex axial grading of

burnable poisons to compensate for any skewed axial power profile. Since such axial

grading would ultimately be dependent on specific reactivity suppression needs over

the lifetime of the core, the development of several different fuel assemblies with

multiple levels of reactivity suppression through burnable poisons is required. These

levels also incorporate three elements:

o Initial reactivity compensation

o Rate of burnable-poison depletion

o Burnable poison effective lifetime.

• Second, initial ideas for soluble-boron free operation also include axial grading of

U235 enrichment. Therefore, each burnable poison arrangement must also be

performed for different overall U235 enrichments.

• Finally, several fuel assemblies with different values for each of the above elements

are required in order to provide a comprehensive set of fuel assemblies for use in full-

core analysis. In this manner, any necessary fuel loading arrangement can be

provided.

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58

4.3.1 Burnable Poison Search

The ability to provide any necessary fuel loading arrangement requires a comprehensive

set of fuel assemblies that possess unique burnup characteristics. These unique burnup

characteristics fall into three types:

1) Fuel assemblies with partial to moderate initial reactivity compensation with a flat

burnup profile.

2) Fuel assemblies with moderate to strong initial reactivity compensation with a peaked

burnup profile.

3) Fuel assemblies with different burnable poison effective lifetimes.

Types 1 and 2 are mutually exclusive, but both Type 1 and Type 2 can be coupled with

different burnable poison effective lifetimes (Type 3). In this manner, a comprehensive set of

fuel assemblies can be provided.

4.3.1.1 Fuel Assembly Type 1: Fuel assemblies with partial to moderate initial reactivity compensation with a flat burnup profile.

In order to find fuel assemblies that match type 1 requirements, an ideal burnable

poison loading geometry for a flat burnup profile must be determined. To create a flat burnup

profile, a look at the physics involved is required.

Since burnable poisons are strong neutron poisons, their presence in fuel pins strongly

influences the local thermal neutron flux. This results in a marked depression of the local

multiplication factor, which diffuses out to ultimately influence the overall multiplication factor

for the entire fuel assembly. The presence of even relatively small amounts of these strong

poisons has a large impact on the multiplication factor, so only a small fraction of fuel pins

within the fuel assembly are loaded with burnable poisons. Even then, the enrichment of

burnable poisons in the fuel pin rarely exceeds 10%.

By way of example, consider a fuel assembly with only 40 out of the 264 fuel pins

poisoned with 4% Gd2O3. The burnup characteristics of such a sparsely poisoned fuel

assembly are seen in contrast to those for a non-poisoned fuel assembly in Figure 16. It can

clearly be seen how the initial multiplication factor of the poisoned assembly is markedly

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59

suppressed from the non-poisoned assembly. However, the high flux environment quickly

depletes the available Gd2O3 and its neutron absorption capabilities gradually deplete with

time, resulting in a smooth increase in the initially depressed multiplication factor. Eventually

all of the Gd2O3 is transmuted by neutron capture, and the fuel assembly mirrors the non-

poisoned assembly. This occurs at a burnup of approximately 14 MWd/Kg.

Figure 16: kinf vs burnup for a poisoned and non-poisoned fuel assembly.

If a flat burnup profile is desired, the depletion of Gd2O3 must match the natural

depletion of U235, so the overall multiplication factor remains constant until all the Gd2O3 has

been depleted. To accomplish this, the fuel assembly must be engineered by altering three

variables:

• The number of poisoned fuel pins.

• The amount of Gd2O3 in each poisoned fuel pin.

• The geometric arrangement of each poisoned fuel pin.

To accomplish this, five typical PWR burnable poison geometric loading arrangements

were identified. These five typical arrangements formed five major groups of fuel assemblies.

The loading geometry for each group is given in Figure 17. As can be seen, each different

loading arrangement contained a different overall amount of poisoned fuel pins.

0.8

0.9

1

1.1

1.2

1.3

1.4

1.5

0 5 10 15 20 25 30

K inf

Burnup (MWd/Kg)

Non-Poisoned Assembly

40 Pins Poisoned with 4% Gd2O3

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60

Figure 17: Burnable poison loading geometry for each of the 5 major groups. Red indicates a control rod, blue is a poisoned fuel pin, and white is a regular fuel pin.

· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·

· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·

· · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · ·· · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · ·· · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·

BP Geometry #1: 16 Poisoned Pins BP Geometry #2: 16 Poisoned Pins

BP Geometry #3: 28 Poisoned Pins BP Geometry #4: 24 Poisoned Pins

BP Geometry #5: 20 Poisoned Pins

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61

Several fuel assemblies with varied Gd2O3 weight fractions were modeled for each

group. An initial study in which all poisoned pins were kept at the same Gd2O3 weight fraction

(4%) was performed. These fuel assemblies are shown in Figure 18.

Figure 18: kinf vs burnup for fuel each major burnable poison loading geometry.

The difference in reactivity compensation is attributed to a few different effects. First,

the total amount of poisoned material and the number of poisoned pins varies for each fuel

assembly type. This is best seen between Burnable Poison geometry (BP geometry) #1 and #3,

where the kinf at BOC is 1.24 and 1.1 respectively, a difference of 0.13. However, even

between #1 and #2, which both contain 16 poisoned pins, a kinf difference of 0.04 at BOC can

be seen. This is attributed to differences in the radial neutron flux profile, which creates

natural hot spots where kinf is larger.

In fuel assemblies with 17x17 geometry, the central fuel pins that are not immediately

surrounded by a control rod tube will be most reactive. Thus, absorber material placed in these

regions will have a large effect on the neutron flux, and therefore the value of kinf. BP

geometry #1 has poisoned pins further from the center, which appropriately have less of an

1

1.05

1.1

1.15

1.2

1.25

1.3

0 2 4 6 8 10 12 14 16 18 20

k inf

Burnup (MWd/Kg)

Poisoned Loading #1

Poisoned Loading #2

Poisoned Loading #3

Poisoned Loading #4

Poisoned Loading #5

Page 80: SBF in SMRs - MartJustinR2013

62

effect on the neutron flux. Conversely, BP geometry #2 has more pins closer to the center, and

this has a larger effect on the neutron flux. This effect produces the 0.04 difference in kinf

between the two assemblies at BOC.

An important effect to take note of is the initial sharp reactivity drop exhibited in each

fuel assembly. This is produced from the buildup of Samarium and Xenon, natural fission

products. Being strong neutron poisons, as more and more are produced they begin to have an

appreciably large effect on reactivity. But since they both possess relatively short half-lives

with respect to the length of a cycle, an equilibrium steady-state concentration is quickly

reached.

It is also important to note that this infinite lattice study, while retaining shroud tubes

for both instrumentation and control rods, is not modeled with any control material in the

control rod positions. Instead, moderator exists in the open control rod tubes. During normal

operation in a 3-D fuel assembly we may expect control rods to be fully or partially inserted.

In this scenario, shadowing and shielding effects would have a pronounced effect on the worth

associated with poisoned pins right next to the control rods. The depression in the neutron flux

produced from the insertion of the control rods reduces the worth associated with both the

control rods and any poisoned pins nearby, while increasing the neutron flux in areas that do

not have any control material.

As can be seen in Figure 18, simply varying the overall BP geometry does not produce

a flat burnup, and increasing or decreasing the Gd2O3 weight fraction would not significantly

alter the behavior of kinf over burnup. Therefore, a further study that individually varies the

Gd2O3 weight fractions is required. While this burnable poison loading will change

individually from one pin to the next, care was taken to maintain symmetry across the entire

fuel assembly. A large number of fuel assemblies were modeled, with several different poison

loading patterns for each BP geometry type. Some of these fuel assemblies are shown in

Figure 19, where each different enrichment loading pattern clearly provides unique burnup

characteristics.

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63

Figure 19: kinf vs burnup for 5.0% U235 enriched fuel assemblies with variations of all 5 BP geometries and with individually varied Gd2O3 weight percentages.

As can be seen, any sort of burnup profile can be attained by altering the BP weight

fraction loading geometry. A few general trends can be seen. First, 5 overall groups of

assemblies can be identified by their relative initial kinf levels. Fuel assemblies where kinf

begins between 1.23-1.19 belong to assemblies of BP geometry type 1 and type 2. Similarly,

1.18-1.14 belongs to type 5, 1.13-1.12 belongs to type 4, and 1.11-1.08 belongs to type 3.

This grouping effect can be attributed to the differences in the overall number of

poisoned fuel pins. To examine why, consider four different fuel assemblies: Two from BP

geometry type 1, one loaded with all 16 fuel pins at 2% Gd2O3, and the other with 12% Gd2O3;

and Two from BP geometry type 3, again with all 28 pins 2% and 12%. Figure 20 shows kinf

vs burnup for these assemblies.

1.05

1.07

1.09

1.11

1.13

1.15

1.17

1.19

1.21

1.23

1.25

0 5 10 15 20 25 30

K inf

Burnup (MWd/Kg)

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64

Figure 20: kinf vs burnup for BP geometry 1 and 3, with 12% and 2% w/o Gd2O3.

As can be seen, the initial excess reactivity suppression provided by the assemblies is

driven by the total number of poisoned fuel pins, and not the overall amount of absorber

material. Comparing BP Geometry 3 with 2% Gd2O3 with BP Geometry 1 with 12% Gd2O3

demonstrates this effect. The 12% assembly has almost 3.5 times the amount of absorber

material, yet the 2% assembly provides more initial reactivity suppression. The reason is due

to shadowing and shielding effects. The 12% poisoned fuel pins provide such a drop in the

neutron flux that they limit their effectiveness. There comes a point where adding more

absorber material to the same fuel pin produces diminishing returns, reducing the overall

effectiveness of the absorber material.

On the other hand, this effect does improve the lifetime of the poison. Additionally, the

total amount of poison in the assembly is the driving force behind the effective lifetime of the

poisons. The 2% Gd2O3 assemblies both demonstrate significantly quick burnup rates, as they

burn out relatively quickly and behave like non-poisoned assemblies around 7 MWd/Kg. This

is due both to a relatively small total amount of poisons, and to the lack of shielding and

shadowing which increases the effectiveness of the absorber material. Meanwhile, the 12%

assemblies demonstrate no appreciable increase in kinf, maintaining the same overall

1

1.05

1.1

1.15

1.2

1.25

1.3

0 5 10 15 20 25 30

k inf

Burnup (MWd/Kg)

BP Geometry 3 with 12% Gd2O3BP Geometry 3 with 2% Gd2O3BP Geometry 1 with 12% Gd2O3BP Geometry 1 with 2% Gd2O3

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65

effectiveness due to strong shadowing and shielding effects. They finally completely burn out

at around 25 MWd/Kg.

As these two effects demonstrate, mixing and matching different Gd2O3 weight

fractions and total absorber loading amounts produces the various burnup characteristics

demonstrated in Figure 19.

Since a flat burnup profile is desired, each fuel assembly in Figure 19 that exhibited a

relatively flat burnup was identified and further modified. In this manner, a group of 5 final

fuel assemblies each with a relatively flat burnup profile were selected. These are shown in

Figure 21.

Figure 21: kinf vs burnup for final 5 fuel assemblies that exhibit a flat burnup profile.

Clearly, different total concentrations of Gd2O3 in the various fuel assembly designs,

and dissimilar numbers of poisoned fuel pins in each assembly, provides a varying amount of

total excess reactivity compensation and contrasting effective burnable poison lifetimes. These

five fuel assemblies were selected for potential use in a full core environment, so iterations of

each of the five fuel assemblies were also modeled with different U235 enrichments (from

2.50% to 4.95% by 0.5%). These fuel assemblies are provided in the Appendix.

1

1.02

1.04

1.06

1.08

1.1

1.12

1.14

1.16

1.18

1.2

0 5 10 15 20 25 30

K inf

Burnup (MWd/Kg)

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66

4.3.1.2 Fuel Assembly Type 2: Fuel assemblies with moderate to strong initial reactivity compensation with a peaked burnup profile

A flat burnup profile will be useful in certain environments, but the ability to have a

peaked profile will be useful in other environments. Specifically, anything from a strong initial

reactivity suppression that quickly depletes to moderate initial reactivity suppression with a

long Gd2O3 lifetime will be potentially useful in a full-core environment. To model these fuel

assemblies, three different variables were independently altered:

1) Total loading amount of Gd2O3

2) Specific enrichment percentages in different fuel pins (while maintaining symmetry)

3) BP Geometry type

As discussed above, altering these three variables produces a wide variety of burnup

profiles.

4.3.1.2.1 Fuel Assembly Type 2: Fuel assemblies with strong initial reactivity compensation with quick depletion

Creating fuel assemblies that provide strong initial reactivity compensation with quick

depletion requires fuel assemblies with a large amount of poisoned pins that contain a low

Gd2O3 enrichment percentage. The large number of poisoned pins will provide the strong

initial suppression, while the low Gd2O3 percentage ensures a quick depletion.

Figure 22 shows the poisoned pin geometry in the 17x17 fuel assembly for fuel

assemblies with these depletion characteristics. 64 out of the 264 total fuel pins are poisoned

with 2%, 3%, and 4% weight percent Gd2O3. Figure 23 demonstrates kinf vs burnup for these

5.00% U235 enriched fuel assemblies. As can be seen, the numerous poisoned pins provide

strong initial reactivity suppression, while the low Gd2O3 weight percent allows for a quick

burnup. The quick burnup results in a smooth increase in kinf until the all the Gd2O3 has been

burned at which point a natural depletion curve is seen. In this case, 2% Gd2O3 results in an

initial kinf of 0.95, far from its natural non-poisoned state of 1.35. Around 10 MWd/Kg all

Gd2O3 has depleted, and the fuel assembly resembles a non-poisoned assembly.

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67

Figure 22: Poisoned pin geometry for fuel assemblies with strong initial reactivity compensation and quick Gd2O3 depletion.

Figure 23: kinf vs burnup for 5.0% U235 fuel assemblies with 64 poisoned pins.

· · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · ·· · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · ·· · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·

64 Poisoned Pins

0.8

0.9

1

1.1

1.2

1.3

1.4

0 5 10 15 20 25 30

K inf

Burnup (MWd/Kg)

Non-Poisoned Assembly2% Gd2O33% Gd2O34% Gd2O3

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68

To provide a complete set of fuel assemblies for use in a full core environment, the 2%,

3% and 4% Gd2O3 fuel assemblies were paired with different U235 enrichments (from 2.50% -

5.0% by 0.5% increments). A graph of kinf vs burnup for these fuel assemblies is provided in

the appendix.

Another possibility for strong initial reactivity compensation with a quick Gd2O3

depletion could be found in a slightly lower number of poisoned fuel pins coupled with a

slightly higher Gd2O3 weigh percentage. In such a configuration, a small increase in Gd2O3

lifetime would provide more initial reactivity compensation. Two different geometrical BP

layouts, with 52 and 64 poisoned pins respectively, are shown in Figure 24.

Figure 24: Burnable poison loading geometry with 52 and 64 poisoned pins.

Both of these assemblies are loaded with 5% and 6% Gd2O3, and kinf vs burnup is

displayed in Figure 25.

· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·

52 Poisoned Pins 56 Poisoned Pins

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69

Figure 25: kinf vs burnup for 5.0% U235 enriched fuel assemblies with 52 and 56 pins poisoned with 5.0% and 6.0% w/o Gd2O3.

These fuel assemblies create additional burnup characteristics that might be useful in a

full core environment. Identical assemblies for each of the above 4 assembly types with

different U235 enrichments were also created (2.50%-5.0% by 0.5%), and those graphs are

available in the appendix.

4.3.1.2.2 Fuel Assembly Type 2: Fuel assemblies with strong initial reactivity compensation with slow depletion

To create fuel assemblies with strong initial reactivity compensation and slow depletion

there must be a large number of poisoned pins with a higher Gd2O3 weight percent. Figure 26

shows the different burnable poison loading patterns. The number of poisoned pins steadily

increases from 44 to 64 out of 264. Each burnable poison geometry was modeled with both

5% and 6% Gd2O3. Figure 27 shows the behavior of kinf vs burnup for 5.0% U235 enriched

assemblies by burnable poison loading geometry.

0.8

0.9

1

1.1

1.2

1.3

1.4

0 5 10 15 20 25 30

K inf

Burnup (MWd/Kg)

Non-Poisoned Assembly52 Poisoned Pins with 5.0% Gd2O352 Poisoned Pins with 6.0% Gd2O356 Poisoned Pins with 5.0% Gd2O356 Poisoned Pins with 6.0% Gd2O3

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70

Figure 26: Five different burnable poison loading geometries for fuel assemblies with strong

initial reactivity compensation and slow depletion.

· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·

· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·

· · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · ·· · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · ·· · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·

44 Poisoned Pins 48 Poisoned Pins

52 Poisoned Pins 56 Poisoned Pins

64 Poisoned Pins

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71

Figure 27: kinf vs burnup for 5.0% U235 enriched fuel assemblies with various numbers of poisoned fuel pins at 5.0% w/o Gd2O3.

As expected, initial reactivity compensation is linearly proportional to the number of

poisoned fuel pins. Also, Gd2O3 depletion is largely irrespective of the number of poisoned

pins – all 5 fuel assemblies resume a normal burnup curve around 15 MWd/Kg. Figure 28

reinforces these findings by showing kinf vs burnup for 5.0% U235 enriched assemblies with

6.0% Gd2O3. There is slightly more initial reactivity compensation, but the largest difference

is in the Gd2O3 lifetime, which completely depletes around 17 MWd/Kg.

0.8

0.9

1

1.1

1.2

1.3

1.4

0 5 10 15 20 25 30

K inf

Burnup (MWd/Kg)

44 Poisoned Pins48 Poisoned Pins52 Poisoned Pins56 Poisoned Pins64 Poisoned PinsNon-Poisoned Assembly

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72

Figure 28: kinf vs burnup for 5.0% U235 enriched fuel assemblies with various numbers of poisoned fuel pins at 6.0% w/o Gd2O3.

A final group of fuel assemblies were created to provide an extraordinarily large

amount of initial reactivity suppression. These assemblies were not designed for realistic use

in a full-core environment; rather they were created for use in hypothetical scenarios to see

how inserting a severely depressed fuel assembly in some axial part of a full-core environment

would affect core operations and the axial power profile. In this manner, they could provide

insight into the upper limit to the impact of poisoned assemblies in a full core environment.

Figure 29 shows the five different burnable poison geometrical loading arrangements

that were used to create these fuel assemblies. The number of poisoned pins linearly increases,

containing 64, 100, 136, 172, and finally 264 poisoned pins. Obviously such dramatically

poisoned pins will exhibit very strong shadowing and shielding effects, along with a highly

suppressed neutron flux.

0.8

0.9

1

1.1

1.2

1.3

1.4

0 5 10 15 20 25 30

K inf

Burnup (MWd/Kg)

44 Poisoned Pins48 Poisoned Pins52 Poisoned Pins56 Poisoned Pins64 Poisoned PinsNon-Poisoned Assembly

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73

Figure 29: Five different burnable poison loading geometries for fuel assemblies with

extraordinarily large initial reactivity compensation.

· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·

· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·

· · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · ·· · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · ·· · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · ·

64 Poisoned Pins 100 Poisoned Pins

136 Poisoned Pins 172 Poisoned Pins

264 Poisoned Pins

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74

Each of these fuel assemblies were loaded with 2%, 3% and 4% weight percent Gd2O3.

Anything above 4% Gd2O3 was observed to provide diminishing returns, since the 4%

poisoned fuel assemblies would already take a relatively long time to deplete due to the strong

shielding and shadowing effects. Figures 30, 31, and 32 show kinf vs burnup for 2%, 3%, and

4% Gd2O3 assemblies.

Figure 30: kinf vs burnup for 5.0% U235 enriched fuel assemblies with various numbers of poisoned fuel pins (from Figure 29) at 2.0% w/o Gd2O3.

Figure 31: kinf vs burnup for 5.0% U235 enriched fuel assemblies with various numbers of poisoned fuel pins (from Figure 29) at 3.0% w/o Gd2O3.

0.4

0.5

0.6

0.7

0.8

0.9

1

1.1

1.2

1.3

0 5 10 15 20 25 30

Kinf

Burnup (MWD/KG)

64 Poisoned Pins100 Poisoned Pins136 Poisoned Pins172 Poisoned Pins264 Poisoned Pins

0.4

0.5

0.6

0.7

0.8

0.9

1

1.1

1.2

1.3

0 5 10 15 20 25 30

Kinf

Burnup (MWD/KG)

64 Poisoned Pins

100 Poisoned Pins

136 Poisoned Pins

172 Poisoned Pins

264 Poisoned Pins

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75

Figure 32: kinf vs burnup for 5.0% U235 enriched fuel assemblies with various numbers of poisoned fuel pins (from Figure 29) at 4.0% w/o Gd2O3.

As expected, increasing the number of poisoned pins dramatically decreases the value

of kinf. Increased shielding and shadowing also decreases Gd2O3 burnup. For 4% Gd2O3, a fuel

assembly with 64 poisoned pins resumes a normal burnup curve around 12 MWd/Kg, whereas

264 poisoned pins depletes at 16 MWd/Kg.

4.3.1.3 Conclusion

In the end, over 80 fuel assemblies were modeled in CASMO, each with unique burnup

characteristics. These differing burnup characteristics provide a wide range of options for use

in a full core environment. Certain burnup characteristics may be required to manage the axial

power offset that arises from partial control rod insertion in a soluble boron-free core.

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

1.1

1.2

1.3

0 5 10 15 20 25 30

Kinf

Burnup (MWD/KG)

64 Poisoned Pins

100 Poisoned Pins

136 Poisoned Pins

172 Poisoned Pins

264 Poisoned Pins

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76

4.4 Description and Analysis of Initial Strategies for Soluble Boron-Free Operation in the Selected SMR Design

As previously discussed, removing soluble boron in a full core environment challenges

the axial power profile due to the dependence on discrete poisons. This challenge must be met

by carefully considering each factor that affects the axial power profile. The main factor arises

from increased dependence on control rods when soluble boron is removed. These rods will be

partially inserted in the core during normal operations, and will thus impact the axial power

profile negatively. To combat this, axially grading both burnable poisons and 235U

enrichment percentage, if done properly, can minimize and negate the impact from active

control rods.

For example, since any partial insertion of control rods will leave the bottom of the core

unsuppressed, loading this region of the core with strong burnable poisons can create a more

uniform reactivity suppression profile throughout the core – and therefore a more uniform

axial flux profile. But the nature of a full core burnup cycle is not steady-state. This initial

arrangement of strong poisons at the bottom to overcome the partial insertion of control rods

would only work properly for a few MWd/Kg of burnup. As the U235 naturally depletes, the

control rods are slowly removed, which alters the impact the control rods have on the axial

power profile. Additionally, as their name suggests, the burnable poisons slowly deplete as

well, reducing their effectiveness as the core is burned. This dynamic situation creates

challenges for the reactor engineer to discover an arrangement that will properly balance the

axial flux profile throughout the lifetime of the core.

This chapter will explore different methodologies to contain this dynamic environment,

and contains two main sections:

• First, establishing a proper radial geometry that minimizes the radial peaking factors.

• Second, searching for a proper axial arrangement of burnable poisons and U235 fuel

enrichment to create as uniform an axial power profile as possible

.

4.4.1 Full Core Radial Loading Geometry

Before jumping into axially grading a full core environment, a foundational 2-D U235

enrichment loading geometry must be selected. This loading arrangement will serve as a

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77

template upon which only axial variations in burnable poisons will be altered. In this manner,

a 2-D profile that minimizes radial peaking factors will be maintained throughout the core.

To achieve this, multiple geometrical loading arrangements were analyzed. In the first

search, only the U235 enrichment was varied, with no burnable poisons present anywhere in the

core. The idea was to determine which enrichment loading geometry would perform best with

respect to the 2-D radial power profile. Figure 33 shows the final geometrical loading

arrangement that appears to demonstrate a preferred performance.

Figure 33: 2-Dimensional U235 Enrichment Loading Geometry.

The outer ring of fuel assemblies was deliberately kept at 4.95% U235 for the duration of

the search. Since smaller cores are more sensitive to neutron leakage, the idea was to minimize

the effects of leakage by placing highly enriched assemblies on the outer ring. While the

current full core geometry makes use of a reflector segment around this outer ring, the leakage

effects still have a dramatic influence on the overall neutron flux and thus the relative power

production in the outer ring. So while this arrangement does not lend itself to an efficient use

of fuel, it is beneficial from a neutron economy perspective.

Figure 34 displays the 2-D relative power fraction at the center of the core and at BOC

for the above loading geometry.

4.95 4.95 4.95

4.95 4.50 4.00 4.50 4.95

4.95 4.50 3.50 3.50 3.50 4.50 4.95

4.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.95

4.95 4.00 3.50 4.00 3.00 4.00 3.50 4.00 4.95

4.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.95

4.95 4.50 3.50 3.50 3.50 4.50 4.95

4.95 4.50 4.00 4.50 4.95

4.95 4.95 4.95

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Figure 34: Relative power fraction for the U235 enrichment loading geometry.

Due to the symmetry of the core, the center fuel assembly is prone to high relative

power fractions and therefore higher peaking factors. To combat this, the center of the core

contains slightly lower enriched assemblies. An effort was made to select a 2-D loading

geometry that contained as many high enriched assemblies as possible, since the total

plutonium loading mass will play a large role in the overall cycle limit of the core.

The above arrangement produced a 2-D relative power fraction that contained a

standard deviation of just 0.107. Since reactor power level is proportional to the neutron flux,

this relatively flat relative power distribution equates to a relatively flat radial flux profile,

which will help lower the overall peaking factors throughout the core.

However, this arrangement was selected without any burnable poisons present. Since

the main purpose behind the use of burnable poisons is reactivity suppression, the presence of

any poisoned assemblies will have a marked impact on the radial flux profile. And since this

full core analysis seeks to find a comprehensive axially poisoned core, it would be inefficient

to conduct an optimization of the radial flux profile for each axial node. Furthermore, the

overall peaking factor for a core is a combination of the radial and axial peaking factors. As

will later be demonstrated, the radial peaking factor is routinely far lower than the axial

peaking factor, minimizing the importance of the radial peaking factor.

0.81 0.89 0.81

0.9 1.07 1.03 1.07 0.9

0.9 1.11 1.04 1.09 1.04 1.11 0.9

0.81 1.07 1.04 1.1 1.13 1.1 1.04 1.07 0.81

0.89 1.03 1.09 1.13 1.06 1.13 1.09 1.03 0.89

0.81 1.07 1.04 1.1 1.13 1.1 1.04 1.07 0.81

0.9 1.11 1.04 1.09 1.04 1.11 0.9

0.9 1.07 1.03 1.07 0.9

0.81 0.89 0.81

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79

For these reasons, this optimization study on the radial enrichment loading geometry is

of little importance moving forward. Instead, the results demonstrated in figure 34 provide

general guidelines that will produce lower radial peaking factors. Namely, the importance of

placing assemblies with relatively lower reactivity in the center and those with higher

reactivity on the outside. But even these guidelines become difficult to enforce in light of the

full cycle length of a typical core. While one loading arrangement may be ideal for the

beginning of the cycle, the depletion of burnable poisons and the movement of control rods,

both of which significantly impact the overall reactivity of each assembly, will render any

attempts at optimizing the radial flux profile over the lifetime of the core useless. There are

simply too many variables in play to prioritize the radial flux profile.

Instead, a focus on optimizing the axial flux profile and the associated axial peaking

factors is desired. For a soluble boron-free core, this peaking factor will be the largest

determining factor behind the overall peaking factor for the core, so it should be highlighted.

In this manner, only general guidelines discovered in this radial flux profile study will be kept

in mind.

4.4.2 Full Core Axial Loading Geometry

As mentioned above, the search for a proper axial loading geometry will require

balancing several different variables at once, and adjusting for their changes through the

lifetime of the cycle. It is expected to be difficult to find a full core loading arrangement that

produces an ideal burnup profile. But this is not an optimization study, so any loading

arrangement that meets the design criteria will be accepted as a final design.

The strategy involved with discovering a suitable full core environment revolves around

balancing the reactivity compensation in such a way that limits the axial flux profile offset.

With this is mind, each different factor that influences the axial flux profile will be examined

and analyzed in relationship to every other factor. There are four main factors that influence

the axial flux profile:

1) Number of active control rods and the collective control rod movement

2) Burnable poison loading, placement, and depletion

3) U235 enrichment percentage and their collective loading geometry

4) Fission product poisoning

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4.4.2.1 Factors influencing the axial flux profile: Number of active control rods and the collective control rod movement

The active control rod bank in normal operations possesses the largest amount of

reactivity worth, and therefore has the largest influence on the axial flux profile. Partially

inserting such a large amount of reactivity in the core must be overcome through some

combination of factors 2-4. Furthermore, any change in the amount of excess reactivity will

result in further active control rod movement. This dynamic situation continually impacts the

axial flux profile and creates a significant challenge in maintaining a proper profile.

There are a few strategies that can be employed to overcome this strong disturbance on

the axial flux profile. The first would be to load the bottom of the core with strong burnable

poisons. If engineered properly, the poisons would contain enough negative reactivity to

match the partial insertion of control rods, and restore a proper axial flux balance. However,

this ideal situation would not last long. As the core depletes, the amount of excess reactivity is

reduced and the control rods are slowly removed to compensate. This results in a further

disturbance in the axial flux profile, and the burnable poison loading strategy that previously

worked becomes less effective.

To manage this, the burnup of poisons must match the depletion of the core, such that

the overall amount of excess reactivity that must be compensated for by the control rods is

kept relatively constant. In this manner, the control rod movement would be minimized until

the burnable poisons are depleted. Unfortunately, at this point there would be nothing to

further counter balance the partially inserted control rods, and the axial flux profile would be

adversely affected. This creates a need for burnable poisons that would last throughout the life

of the core.

Since there is a set amount of total excess reactivity that must be compensated, any

increase in burnable poisons would affect the amount of reactivity compensated for by control

rods, and thus affect the overall control rod insertion depth. Any change in control rod

insertion depth would affect the axial flux profile unless it is carefully matched by burnable

poisons. This iterative process would require a careful balance of the reactivity compensation

strategy between control rods and burnable poisons.

Additionally, several other factors play a role in control rod insertion depth, such as

fission product poisoning, shielding and shadowing effects, and other smaller reactor

transients. This creates a situation that is very difficult to optimize. Additional complications

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81

introduced through axially grading the U235 enrichment percentages would further increase the

complexity.

4.4.2.2 Factors influencing the axial flux profile: Burnable poison loading, placement, and depletion

Unlike control rods, burnable poisons are not actively controlled. Their placement

within the core is determined before operation, and cannot be altered in any way. For the

soluble boron-free core that is dependent on careful engineering of excess reactivity

compensation strategies, there is limited room for error. For example, if a large transient

knocks the control rods from their expected location in the core, the axial flux profile would

be altered. This creates locations of higher than expected flux, which would increase the rate

of burnup in that specific area and decrease the rate of burnup in a different area. Over time,

this has the potential to significantly alter the depletion characteristics within the core, and

compromise the careful and extensive work of the reactor engineers.

In other words, the soluble boron-free core is sensitive to large reactor transients, and

there is little room for error. All of this places increased importance on developing a robust

core that resists and manages the unwanted effects of reactor transients. But this engineering

must be done beforehand, and it must be reflected in the final burnable poison loading

arrangement.

4.4.2.3 Factors influencing the axial flux profile: U235 enrichment and their collective loading arrangement

As discussed in section 4.4.1, it is necessary to carefully balance the excess reactivity

compensation strategy between control rods and burnable poisons. Altering the U235

enrichment percentage presents a different impact by reducing or increasing the overall excess

reactivity in the core. Even a simple alteration to the U235 enrichment will require re-

engineering the careful balance between burnable poisons and control rod movement, let alone

axially grading the U235 enrichment in individual fuel assemblies.

The natural burnup behavior in a soluble boron-free core exhibits an axial power offset

skewed toward the bottom of the core at BOC (Figure 35). If no corrections are made, this

increased neutron flux and power density at the bottom of the core leads to increased depletion

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82

of U235. Eventually, this loss of fuel ultimately drives the axial offset upward, where the

presence of control rods have previously shielded the U235 in the top of the core from

depletion. This creates relatively high U235 loads at the top of the core at EOC. This effect is

driving force behind the positive axial power offset at EOC (Figure 35).

Figure 35: Natural power profile for soluble boron-free core at BOC and EOC.

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One strategy to potentially alter this effect would be to load the top of the core with

initially low enrichments. While this strategy would negatively affect the initial axial power

offset at BOC by placing higher enrichments at the bottom of the core, it would help with this

EOC issue. So while any U235 axial enrichment scheme would solve one problem only to

exacerbate another, it could be beneficial since burnable poison schemes can be used to

control the BOC axial power offset.

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Chapter 5 - Results

With the above considerations in mind, a search for a full core arrangement that

satisfies the design requirements can begin. This study followed an educated trial and error

basis, where a first design is selected, results are analyzed, and various iterations of possible

improvement strategies are performed. Due to the complex nature of all the physics involved

and the various strategies for improvement, there are several potential arrangements to be

performed.

Each full core design will be analyzed with respect to 3 main factors:

1) Full core pin (power) peaking factors. This is the primary concern for a soluble boron

free core due to the dependence on discrete poisons. If these are deemed acceptable,

any further implications behind a skewed axial or radial power profile could

potentially be acceptable as well.

2) Axial power offset. Any departure from the ideal chopped cosine axial power profile

represents an increased potential for egregious peaking factors. Thus any

improvement in the axial power offset represents potential improvement in the full

core peaking factors.

3) Control rod insertion depth. Since control rods represent the largest influence on the

axial power profile, examining their behavior over the life of the core will help in

determining strategies for improvement.

Consider for a moment the large degree of complexity in this search. On a macro level,

in the overall core calculation model there are 25 axial nodes, each 8cm in length. A specific

fuel assembly design (outlined in Section 4.3) must be selected for each of these 25 nodes, and

for each of the 57 fuel assemblies in the core. Thankfully, due to the symmetry of the reactor

core as outlined in Figure 36, only 9 fuel assemblies are varied across the core. Nevertheless,

since there are over 80 fuel assembly possibilities to choose from (Section 4.3), and to place in

each axial node for each fuel assembly location, there are an immense amount of total reactor

core configuration possibilities.

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85

Figure 36: Full core symmetry.

Beyond the immense possibilities that exist for the reactor engineer, the sheer

complexity raises questions on how best to display the relevant information. Instead of

providing the exact, detailed layout of each core configuration, a graph of the total burnable

poison loading (in grams) vs. core height (in cm) will be provided. The information presented

in this graph only displays the total amount of burnable poisons in each axial node, but does

not provide information regarding how the poisons are distributed radially, or their respective

weight percentage in each fuel pin.

For this detailed information, the appendix contains a nodal map of each core trial,

displaying the total burnable poison loading (in grams) for each fuel assembly in all 25 axial

nodes. Similarly, a graph of the average U235 enrichment vs core height (cm) will be provided.

The appendix will again provide information on how the U235 enrichment was radially

distributed.

The search for a core that satisfies the design requirements spanned 5 groups of axial

cores. Each group consisted of similar strategies with slight variations between each trial.

Subsequently, the first axially graded core in each group will be discussed in detail. The

remaining cores in each group will be discussed and analyzed together.

0 0 0

0 1 2 1 0

0 3 4 5 4 3 0

0 1 4 6 7 6 4 1 0

0 2 5 7 8 7 5 2 0

0 1 4 6 7 6 4 1 0

0 3 4 5 4 3 0

0 1 2 1 0

0 0 0

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5.1 First Group of Axially Graded SMR Cores

5.1.1 First Axially Graded SMR Core

The first design employed a simple loading of Gd2O3 throughout the core, with a

majority of the Gd2O3 placed in the lower half of the core in an attempt to compensate for

partial control rod insertion. Figure 37 displays the total Gd2O3 loading and the average U235

enrichment vs core height. The total loading amount did not surpass 500 grams of Gd2O3,

which correlated to the use of nominally poisoned fuel assemblies. Furthermore, the U235

enrichment loading pattern followed the guidelines found in Section 4.4.1, with less U235 in

the lower half of the core to further combat any axial power offset.

Figure 37: Burnable poison loading and average U235 enrichment vs core height for the first core in the first group of axially graded cores.

3.00 3.20 3.40 3.60 3.80 4.00 4.20 4.40 4.60 4.80 5.00

0

20

40

60

80

100

120

140

160

180

200

0

20

40

60

80

100

120

140

160

180

200

0 50 100 150 200 250 300 350 400 450 500

Average Burnup (MWD/KG) Enrichment

Core

Hei

ght (

cm)

Gd2O3 Loading (g)

1st Axial Core - BP Loading (g)

1st Axial Core - U235Enrichment

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Each core trial in this first group of axially graded cores only utilized the nominally

poisoned fuel assemblies from Section 4.3.1. These fuel assemblies are displayed in Figure 38,

and they attempted to provide a “flat burn” throughout the burnup profile. The idea behind the

use of these fuel assemblies was to create a poisoned core that kept a constant amount of

excess reactivity compensation. If done properly, control rod movement would be kept to a

minimum, allowing for a relatively uniform axial flux profile throughout the life of the

burnable poisons. These burnable poisons do not completely deplete until around 25

MWd/Kg, which is close to the expected lifetime of this SMR.

Figure 38: 5.0% U235 enriched “Flat burn” fuel assemblies that were employed in the first group of axially graded cores.

Figures 39 and 40 display the average U235 enrichment and individual radial Gd2O3

loading for each axial node for this first axially graded core. Every assembly in the bottom of

the core was nominally poisoned to combat any axial power offset, while the top of the core

contained minimal poisons in the central assemblies to dampen any potential peaking factors.

The radial U235 enrichment scheme followed the guidelines found in Section 4.4.1, with the

central assemblies containing less U235. The outer ring of assemblies were non-poisoned 5.0%

U235 in an attempt to minimize the effects of leakage.

1

1.02

1.04

1.06

1.08

1.1

1.12

1.14

1.16

1.18

1.2

0 5 10 15 20 25 30 35

kinf

Burnup (MWd/Kg)

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Figure 39: Average burnable poison loading (grams) per node for the first axial core.

0 0 0 0 0 0 0 0 00 9.603 9.603 9.603 0 0 9.603 9.603 9.603 0 0 11.32 11.32 11.32 0

0 11.32 9.603 9.603 9.603 11.32 0 0 11.32 11.32 11.32 11.32 11.32 0 0 11.32 11.32 11.32 11.32 11.32 00 9.603 9.603 7.545 14.4 7.545 9.603 9.603 0 0 9.603 11.32 7.545 14.4 7.545 11.32 9.603 0 0 11.32 11.32 7.545 14.4 7.545 11.32 11.32 00 9.603 9.603 14.4 7.545 14.4 9.603 9.603 0 0 9.603 11.32 14.4 7.545 14.4 11.32 9.603 0 0 11.32 11.32 14.4 9.603 14.4 11.32 11.32 00 9.603 9.603 7.545 14.4 7.545 9.603 9.603 0 0 9.603 11.32 7.545 14.4 7.545 11.32 9.603 0 0 11.32 11.32 7.545 14.4 7.545 11.32 11.32 0

0 11.32 9.603 9.603 9.603 11.32 0 0 11.32 11.32 11.32 11.32 11.32 0 0 11.32 11.32 11.32 11.32 11.32 00 9.603 9.603 9.603 0 0 9.603 9.603 9.603 0 0 11.32 11.32 11.32 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 11.32 11.32 11.32 0 0 11.32 11.32 11.32 0 0 11.32 11.32 11.32 0

0 11.32 11.32 11.32 11.32 11.32 0 0 11.32 11.32 11.32 11.32 11.32 0 0 11.32 11.32 11.32 11.32 11.32 00 11.32 11.32 7.545 14.4 7.545 11.32 11.32 0 0 11.32 11.32 11.32 14.4 11.32 11.32 11.32 0 0 11.32 11.32 7.545 14.4 7.545 11.32 11.32 00 11.32 11.32 14.4 9.603 14.4 11.32 11.32 0 0 11.32 11.32 14.4 9.603 14.4 11.32 11.32 0 0 11.32 11.32 14.4 9.603 14.4 11.32 11.32 00 11.32 11.32 7.545 14.4 7.545 11.32 11.32 0 0 11.32 11.32 11.32 14.4 11.32 11.32 11.32 0 0 11.32 11.32 7.545 14.4 7.545 11.32 11.32 0

0 11.32 11.32 11.32 11.32 11.32 0 0 11.32 11.32 11.32 11.32 11.32 0 0 11.32 11.32 11.32 11.32 11.32 00 11.32 11.32 11.32 0 0 11.32 11.32 11.32 0 0 11.32 11.32 11.32 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 11.32 11.32 11.32 0 0 9.603 9.603 9.603 0 0 9.603 9.603 9.603 0

0 11.32 11.32 11.32 11.32 11.32 0 0 11.32 9.603 9.603 9.603 11.32 0 0 11.32 9.603 9.603 9.603 11.32 00 11.32 11.32 7.545 14.4 7.545 11.32 11.32 0 0 9.603 9.603 7.545 11.32 7.545 9.603 9.603 0 0 9.603 9.603 7.545 11.32 7.545 9.603 9.603 00 11.32 11.32 14.4 9.603 14.4 11.32 11.32 0 0 9.603 9.603 11.32 7.545 11.32 9.603 9.603 0 0 9.603 9.603 11.32 7.545 11.32 9.603 9.603 00 11.32 11.32 7.545 14.4 7.545 11.32 11.32 0 0 9.603 9.603 7.545 11.32 7.545 9.603 9.603 0 0 9.603 9.603 7.545 11.32 7.545 9.603 9.603 0

0 11.32 11.32 11.32 11.32 11.32 0 0 11.32 9.603 9.603 9.603 11.32 0 0 11.32 9.603 9.603 9.603 11.32 00 11.32 11.32 11.32 0 0 9.603 9.603 9.603 0 0 9.603 9.603 9.603 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 9.603 9.603 9.603 0 0 4.801 4.801 4.801 0 0 0 0 0 0

0 11.32 4.801 4.801 4.801 11.32 0 0 7.545 4.801 4.801 4.801 7.545 0 0 9.603 0 0 0 9.603 00 9.603 4.801 9.603 11.32 9.603 4.801 9.603 0 0 4.801 4.801 9.603 11.32 9.603 4.801 4.801 0 0 0 0 9.603 11.32 9.603 0 0 00 9.603 4.801 11.32 4.801 11.32 4.801 9.603 0 0 4.801 4.801 11.32 4.801 11.32 4.801 4.801 0 0 0 0 11.32 4.801 11.32 0 0 00 9.603 4.801 9.603 11.32 9.603 4.801 9.603 0 0 4.801 4.801 9.603 11.32 9.603 4.801 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0

0 11.32 4.801 4.801 4.801 11.32 0 0 7.545 4.801 4.801 4.801 7.545 0 0 9.603 0 0 0 9.603 00 9.603 9.603 9.603 0 0 4.801 4.801 4.801 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 0 0 11.32 4.801 11.32 0 0 0 0 0 0 11.32 4.801 11.32 0 0 0 0 0 0 11.32 4.801 11.32 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 0 0 11.32 4.801 11.32 0 0 0 0 0 0 11.32 4.801 11.32 0 0 0 0 0 0 11.32 4.801 11.32 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 0 0 11.32 4.801 11.32 0 0 0 0 0 0 11.32 4.801 11.32 0 0 0 0 0 0 11.32 4.801 11.32 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 0 0 11.32 4.801 11.32 0 0 0 0 0 0 11.32 4.801 11.32 0 0 0 0 0 0 11.32 4.801 11.32 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 1st Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 16: 120-128 cm

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89

Figure 40: Fuel assembly U235 enrichment per node for the first axial core.

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 3.50 3.50 3.50 4.95 4.95 3.50 3.50 3.50 4.95 4.95 3.50 3.50 3.50 4.95

4.95 3.50 3.00 3.00 3.00 3.50 4.95 4.95 3.50 3.00 3.00 3.00 3.50 4.95 4.95 3.50 3.00 3.00 3.00 3.50 4.954.95 3.50 3.00 2.50 3.00 2.50 3.00 3.50 4.95 4.95 3.50 3.00 2.50 3.00 2.50 3.00 3.50 4.95 4.95 3.50 3.00 2.50 3.00 2.50 3.00 3.50 4.954.95 3.50 3.00 3.00 2.50 3.00 3.00 3.50 4.95 4.95 3.50 3.00 3.00 2.50 3.00 3.00 3.50 4.95 4.95 3.50 3.00 3.00 2.50 3.00 3.00 3.50 4.954.95 3.50 3.00 2.50 3.00 2.50 3.00 3.50 4.95 4.95 3.50 3.00 2.50 3.00 2.50 3.00 3.50 4.95 4.95 3.50 3.00 2.50 3.00 2.50 3.00 3.50 4.95

4.95 3.50 3.00 3.00 3.00 3.50 4.95 4.95 3.50 3.00 3.00 3.00 3.50 4.95 4.95 3.50 3.00 3.00 3.00 3.50 4.954.95 3.50 3.50 3.50 4.95 4.95 3.50 3.50 3.50 4.95 4.95 3.50 3.50 3.50 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 3.50 3.50 3.50 4.95 4.95 3.50 3.50 3.50 4.95 4.95 3.50 3.50 3.50 4.95

4.95 3.50 3.00 3.00 3.00 3.50 4.95 4.95 3.50 3.00 3.00 3.00 3.50 4.95 4.95 3.50 3.00 3.00 3.00 3.50 4.954.95 3.50 3.00 2.50 3.00 2.50 3.00 3.50 4.95 4.95 3.50 3.00 2.50 3.00 2.50 3.00 3.50 4.95 4.95 3.50 3.00 2.50 3.00 2.50 3.00 3.50 4.954.95 3.50 3.00 3.00 2.50 3.00 3.00 3.50 4.95 4.95 3.50 3.00 3.00 2.50 3.00 3.00 3.50 4.95 4.95 3.50 3.00 3.00 2.50 3.00 3.00 3.50 4.954.95 3.50 3.00 2.50 3.00 2.50 3.00 3.50 4.95 4.95 3.50 3.00 2.50 3.00 2.50 3.00 3.50 4.95 4.95 3.50 3.00 2.50 3.00 2.50 3.00 3.50 4.95

4.95 3.50 3.00 3.00 3.00 3.50 4.95 4.95 3.50 3.00 3.00 3.00 3.50 4.95 4.95 3.50 3.00 3.00 3.00 3.50 4.954.95 3.50 3.50 3.50 4.95 4.95 3.50 3.50 3.50 4.95 4.95 3.50 3.50 3.50 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 3.50 3.50 3.50 4.95 4.95 4.00 4.00 4.00 4.95 4.95 4.50 4.00 4.50 4.95

4.95 3.50 3.00 3.00 3.00 3.50 4.95 4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 4.00 4.00 4.00 4.00 4.00 4.954.95 3.50 3.00 2.50 3.00 2.50 3.00 3.50 4.95 4.95 4.00 3.50 3.50 3.50 3.50 3.50 4.00 4.95 4.95 4.50 4.00 3.50 3.50 3.50 4.00 4.50 4.954.95 3.50 3.00 3.00 2.50 3.00 3.00 3.50 4.95 4.95 4.00 3.50 3.50 3.00 3.50 3.50 4.00 4.95 4.95 4.00 4.00 3.50 3.00 3.50 4.00 4.00 4.954.95 3.50 3.00 2.50 3.00 2.50 3.00 3.50 4.95 4.95 4.00 3.50 3.50 3.50 3.50 3.50 4.00 4.95 4.95 4.50 4.00 3.50 3.50 3.50 4.00 4.50 4.95

4.95 3.50 3.00 3.00 3.00 3.50 4.95 4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 4.00 4.00 4.00 4.00 4.00 4.954.95 3.50 3.50 3.50 4.95 4.95 4.00 4.00 4.00 4.95 4.95 4.50 4.00 4.50 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.50 4.00 4.50 4.95 4.95 4.00 3.50 4.00 4.95 4.95 4.50 4.00 4.50 4.95

4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 4.50 3.50 3.50 3.50 4.50 4.954.95 4.50 3.50 3.00 4.00 3.00 3.50 4.50 4.95 4.95 4.00 3.50 3.00 4.00 3.00 3.50 4.00 4.95 4.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.954.95 4.00 3.50 4.00 3.00 4.00 3.50 4.00 4.95 4.95 3.50 3.50 4.00 3.00 4.00 3.50 3.50 4.95 4.95 4.00 3.50 4.00 3.00 4.00 3.50 4.00 4.954.95 4.50 3.50 3.00 4.00 3.00 3.50 4.50 4.95 4.95 4.00 3.50 3.00 4.00 3.00 3.50 4.00 4.95 4.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.95

4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 4.50 3.50 3.50 3.50 4.50 4.954.95 4.50 4.00 4.50 4.95 4.95 4.00 3.50 4.00 4.95 4.95 4.50 4.00 4.50 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.50 4.00 4.50 4.95 4.95 4.50 4.00 4.50 4.95 4.95 4.50 4.00 4.50 4.95

4.95 4.50 3.50 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 3.50 4.50 4.954.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.954.95 4.00 3.50 4.00 3.00 4.00 3.50 4.00 4.95 4.95 4.00 3.50 4.00 3.00 4.00 3.50 4.00 4.95 4.95 4.00 3.50 4.00 3.00 4.00 3.50 4.00 4.954.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.95

4.95 4.50 3.50 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 3.50 4.50 4.954.95 4.50 4.00 4.50 4.95 4.95 4.50 4.00 4.50 4.95 4.95 4.50 4.00 4.50 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.50 4.00 4.50 4.95 4.95 4.50 4.00 4.50 4.95 4.95 4.50 4.00 4.50 4.95

4.95 4.50 3.50 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 3.50 4.50 4.954.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.954.95 4.00 3.50 4.00 3.00 4.00 3.50 4.00 4.95 4.95 4.00 3.50 4.00 3.00 4.00 3.50 4.00 4.95 4.95 4.00 3.50 4.00 3.00 4.00 3.50 4.00 4.954.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.95

4.95 4.50 3.50 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 3.50 4.50 4.954.95 4.50 4.00 4.50 4.95 4.95 4.50 4.00 4.50 4.95 4.95 4.50 4.00 4.50 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.50 4.00 4.50 4.95 4.95 4.50 4.00 4.50 4.95 4.95 4.50 4.00 4.50 4.95

4.95 4.50 3.50 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 3.50 4.50 4.954.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.954.95 4.00 3.50 4.00 3.00 4.00 3.50 4.00 4.95 4.95 4.00 3.50 4.00 3.00 4.00 3.50 4.00 4.95 4.95 4.00 3.50 4.00 3.00 4.00 3.50 4.00 4.954.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.95

4.95 4.50 3.50 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 3.50 4.50 4.954.95 4.50 4.00 4.50 4.95 4.95 4.50 4.00 4.50 4.95 4.95 4.50 4.00 4.50 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.50 4.00 4.50 4.95 4.95 4.50 4.00 4.50 4.95 4.95 4.50 4.00 4.50 4.95

4.95 4.50 3.50 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 3.50 4.50 4.954.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.954.95 4.00 3.50 4.00 3.00 4.00 3.50 4.00 4.95 4.95 4.00 3.50 4.00 3.00 4.00 3.50 4.00 4.95 4.95 4.00 3.50 4.00 3.00 4.00 3.50 4.00 4.954.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.95

4.95 4.50 3.50 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 3.50 4.50 4.954.95 4.50 4.00 4.50 4.95 4.95 4.50 4.00 4.50 4.95 4.95 4.50 4.00 4.50 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 1st Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

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90

This first axially graded core employed the simple strategy outlined above, which was

derived from the reactor’s expected behavior under soluble boron-free conditions. The actual

behavior of the reactor will drive further iterations of this first basic strategy. In sum, this

strategy employed the following ideas:

• Nominal poisoning toward the bottom half of the core, with partial poisoning in the

top to combat peaking factors. Gd2O3 loading did not exceed 500 grams in any node

• Low enriched U235 near the bottom of the core to combat axial power offset, with

higher enriched nodes at the top for a longer lifetime

• Radial U235 enrichment loading that follows general guidelines from section 4.1

• Use of “flat burn” fuel assemblies to maintain consistent excess reactivity

compensation

• Non poisoned 4.95% enriched assemblies at the outer edge of the core to combat

neutron leakage

Figures 41 and 42 show the results from depleting this first core to 30 MWd/Kg. The

axial power profile demonstrates the effectiveness of loading burnable poisons in the bottom

of the core; at BOC the axial power offset was surprisingly positive 0.35. However this data is

deceptive since the control rods are 100% inserted at BOC, and are not withdrawn until 5

MWd/Kg, revealing a deficit of excess reactivity compensation. And once they begin to be

withdrawn, the axial offset sharply dives, settling at -0.3 before continuing a slow descent

until 15 MWd/Kg. This clearly demonstrates the strong effect partial control rod insertion has

on the axial offset.

Due to this lack of sufficient excess reactivity compensation, the reactor is supercritical

until 5 MWd/Kg. This is clearly unacceptable, and later full core trials will have to incorporate

more excess reactivity compensation or less U235.

At around 15 MWd/Kg, the control rods begin to steadily withdraw, signifying a

gradual decline in the burnable poison effectiveness until they are all depleted. At this time,

the axial offset begins to steadily move upward in response to the control rod withdrawal. At

the EOC, the top of the core contains relatively high U235 enriched assemblies due to shielding

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91

and shadowing from the presence of control rods. This continues to drive the axial offset

upward, ending at a very high value of 0.8.

Figure 41: Axial offset and control rod insertion vs burnup for the first core.

Figure 42: Maximum total peaking factor vs burnup for the first core and soluble boron core.

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

-1

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1

0 5 10 15 20 25 30

Cont

rol R

od In

sert

ion

Perc

enta

ge

Axia

l Pow

er O

ffset

Burnup (MWd/Kg)

Axial Offset (1st Axial Core)

Control Rod Insertion (1st Axial Core)

1

1.5

2

2.5

3

3.5

4

4.5

0 5 10 15 20 25 30

Max

imum

Pea

king

Fac

tor

Burnup (MWD/Kg)

1st Axial Core

Soluble Boron Core

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92

Surprisingly, the overall peaking factors for this first core do not reflect the strong axial

offset. While the peaking factors start high, by the time the control rods begin to be withdrawn

they settle at around 2.6, which is actually lower than a core running soluble boron. While this

result is surprising, it must be taken with a grain of salt due to the fact that the control rods did

not begin to be withdrawn from their fully inserted position until 5 MWd/Kg. This signifies a

lack of necessary excess reactivity compensation, as the control rods were completely inserted

and still could not bring the multiplication factor to 1. In other words, the core was

supercritical until 5 MWd/Kg, reflecting unrealistic scenarios.

5.1.2 Further Axially Graded SMR cores from the First Group

The above detailed discussion involved the first core in the first group of cores. Axial

cores 1 through 7 comprise this first group. From the results we can identify the need for

increased reactivity suppression at BOC, and a better strategy for combating the long term rise

in axially power from relatively highly enriched assemblies. In this respect, the 7 other

relevant reactor cores from this first group are presented below.

Figure 43 shows the variations in average axial burnable poison loading for each

subsequent core. For this first group of cores, the total Gd2O3 loading in each node did not

exceed 500 grams. Instead, to address the need for additional excess reactivity suppression at

BOC, more burnable poisons were loaded throughout the core.

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93

Figure 43: Burnable poison loading vs core height for all cores in the first group of axially graded cores.

Figure 44 shows the differences in average U235 enrichment in each axial core. As a

second means of reducing initial excess reactivity, subsequent cores were loaded with lower

U235 enriched assemblies, ultimately lowering the total amount of fissile material. While this

strategy helps reduce the total reactivity compensation needed at BOC, it will also shorten

core lifetime. This might prompt a return to higher enriched assemblies, but it is important to

see what role the various enrichments play on the axial offset and the maximum peaking

factors within the core.

0

20

40

60

80

100

120

140

160

180

200

0 50 100 150 200 250 300 350 400 450 500

Core

Hei

ght (

cm)

Gd2O3 Loading (g)

1st Axial Core2nd Axial Core3rd Axial Core4th Axial Core5th Axial Core6th Axial Core7th Axial Core8th Axial Core

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94

Figure 44: Average U235 enrichment vs core height for the first group of axially graded cores.

Figures 45 and 46 show the axial power offset and control rod insertion percentage vs

burnup for each axial core. The axial offset graphs demonstrate the inability of the above cores

to adequately reduce the initial excess reactivity; the control rods do not begin to be

withdrawn until 2-4 MWd/Kg in each core. The only exception is the 2nd core, which is

identical to the 1st core except for 300 grams of Gd2O3 loaded in each axial node in the top

half of the core.

Unfortunately this had a side effect of suppressing the neutron flux in the top half of the

core and further exacerbating the axial offset at the BOC. This further increased the shielding

and shadowing effects and produced a slightly more severe axial offset toward the top of the

core at EOC. This demonstrates the interplay between each variable. Any adjustment in poison

loading or enrichment will affect the overall performance of the core in a number of different

ways.

0

20

40

60

80

100

120

140

160

180

200

2.5 3 3.5 4 4.5 5

Core

Hei

ght (

cm)

Average Burnup (MWD/KG) Enrichment

1st Axial Core

2nd Axial Core

3rd Axial Core

4th Axial Core

5th Axial Core

6th Axial Core

7th Axial Core

8th Axial Core

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95

Figure 45: Axial power offset vs burnup for the first group of axially graded cores.

Figure 46: Control rod insertion vs burnup for the first group of axially graded cores.

-1

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1

0 5 10 15 20 25 30

Axia

l Pow

er O

ffset

Burnup (MWd/Kg)

1st Axial Core2nd Axial Core3rd Axial Core4th Axial Core5th Axial Core6th Axial Core7th Axial Core8th Axial Core

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

0 5 10 15 20 25 30

Cont

rol R

od In

sert

ion

Perc

enta

ge

Burnup (MWd/Kg)

1st Axial Core

2nd Axial Core

3rd Axial Core

4th Axial Core

5th Axial Core

6th Axial Core

7th Axial Core

8th Axial Core

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96

Figure 47 demonstrates the peaking factors for this first group of cores. Interestingly,

the severe axial offset did not impact the peaking factors in a completely egregious way.

However, since the control rods were not withdrawn until 2-3 MWd/Kg, the performance of

these cores must be taken with a grain of salt. These cores had the control rods completely

inserted at BOC, while the core was in its most reactive state, which severely impacted the

axial offset and thus the peaking factors as well. Until the initial excess reactivity can be

brought under control, these results should not be taken seriously. In fact, as soon as the

control rods began to be withdrawn, the peaking factors sharply rose.

The only exception would be core #2, which does show promise with its relatively low

peaking factors even though they steadily rise toward the EOC. Nevertheless, it would be

difficult for any reactor engineer to accept a design with such a highly skewed axial offset,

even if the overall peaking factors somehow remain relatively small.

Figure 47: Maximum total peaking factor vs burnup for the first group of axially graded cores.

1

1.5

2

2.5

3

3.5

4

4.5

5

5.5

6

0 5 10 15 20 25 30

Max

imum

Pea

king

Fac

tor

Burnup (MWd/Kg)

1st Axial Core2nd Axial Core3rd Axial Core4th Axial Core5th Axial Core6th Axial Core7th Axial Core8th Axial Core

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97

5.2 Second Group of Axially Graded SMR Cores

5.2.1 First Core from Second Group of Axially Graded SMR cores

A prevailing theme from the first group of cores included a lack of initial excess

reactivity along with difficulty in minimizing the axial offset throughout the middle of cycle

(MOC) and EOC. To alleviate these issues, this group of cores employs the following

strategies:

• Nominal poisoning throughout the core, with increased poisons at the bottom of the

core and a reduced percentage of burnable poisons at the top of the core. Gd2O3

loading did not exceed 500 grams in any node

• Low enriched U235 near the bottom of the core to combat axial power offset, with

higher enriched assemblies at the top for a longer lifetime

• Radial U235 enrichment loading that follows general guidelines from section 4.1

• Use of “flat burn” fuel assemblies to maintain consistent excess reactivity

compensation

• Non poisoned 4.95% enriched assemblies at the outer edge of the core to combat

neutron leakage

The only significant changes from the first group of cores is a change of strategy by

placing limited to no burnable poisons in the top of the core. But each node still does not

contain more than 500 grams of Gd2O3 and the “flat burn” fuel assemblies are still exclusively

used. Figure 48 displays the total Gd2O3 loading and the average U235 enrichment vs core

height, and Figures 49 and 50 display the individual poisoning in each assembly for each axial

node, and the U235 enrichment in each assembly per node, respectively.

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98

Figure 48: Burnable poison loading and average U235 enrichment vs core height for the 9th core.

3.00 3.20 3.40 3.60 3.80 4.00 4.20 4.40 4.60 4.80 5.00

0

20

40

60

80

100

120

140

160

180

200

0

20

40

60

80

100

120

140

160

180

200

0 50 100 150 200 250 300 350 400 450 500

Average Burnup (MWD/KG) Enrichment

Core

Hei

ght (

cm)

Gd2O3 Loading (g)

9th Axial Core - BP Loading (g)

9th Axial Core - U235 Enrichment

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Figure 49: Average burnable poison loading (grams) per node for the 9th core.

0 0 0 0 0 0 0 0 00 11.32 9.603 11.32 0 0 11.32 9.603 11.32 0 0 11.32 9.603 11.32 0

0 11.32 11.32 7.545 11.32 11.32 0 0 11.32 11.32 7.545 11.32 11.32 0 0 11.32 11.32 7.545 11.32 11.32 00 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 11.32 11.32 7.545 7.545 7.545 11.32 11.32 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0

0 11.32 11.32 7.545 11.32 11.32 0 0 11.32 11.32 7.545 11.32 11.32 0 0 11.32 11.32 7.545 11.32 11.32 00 11.32 9.603 11.32 0 0 11.32 9.603 11.32 0 0 11.32 9.603 11.32 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 11.32 9.603 11.32 0 0 0 9.603 0 0 0 0 9.603 0 0

0 11.32 11.32 7.545 11.32 11.32 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 11.32 11.32 7.545 11.32 11.32 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 11.32 9.603 11.32 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 9th Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 16: 120-128 cm

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100

Figure 50: Fuel assembly U235 enrichment per node for the 9th core.

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 2.50 3.00 2.50 4.95 4.95 2.50 3.00 2.50 4.95 4.95 2.50 3.00 2.50 4.95

4.95 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 4.954.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 4.954.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.954.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 4.95

4.95 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 4.954.95 2.50 3.00 2.50 4.95 4.95 2.50 3.00 2.50 4.95 4.95 2.50 3.00 2.50 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 2.50 3.00 2.50 4.95 4.95 2.50 3.00 2.50 4.95 4.95 2.50 3.00 2.50 4.95

4.95 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 4.954.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 4.954.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.954.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 4.95

4.95 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 4.954.95 2.50 3.00 2.50 4.95 4.95 2.50 3.00 2.50 4.95 4.95 2.50 3.00 2.50 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 2.50 3.00 2.50 4.95 4.95 2.50 3.00 2.50 4.95 4.95 2.50 3.00 2.50 4.95

4.95 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 4.954.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 4.954.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.954.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 4.95

4.95 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 4.954.95 2.50 3.00 2.50 4.95 4.95 2.50 3.00 2.50 4.95 4.95 2.50 3.00 2.50 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.00 4.00 4.00 4.95 4.95 4.00 4.00 4.00 4.95 4.95 4.00 4.00 4.00 4.95

4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.50 4.00 4.954.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95 4.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95 4.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.954.95 4.00 3.50 3.50 3.00 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.00 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.00 3.50 3.50 4.00 4.954.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95 4.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95 4.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95

4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.50 4.00 4.954.95 4.00 4.00 4.00 4.95 4.95 4.00 4.00 4.00 4.95 4.95 4.00 4.00 4.00 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.00 4.00 4.00 4.95 4.95 4.00 4.00 4.00 4.95 4.95 4.00 4.00 4.00 4.95

4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.50 4.00 4.954.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95 4.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95 4.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.954.95 4.00 3.50 3.50 3.00 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.00 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.00 3.50 3.50 4.00 4.954.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95 4.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95 4.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95

4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.50 4.00 4.954.95 4.00 4.00 4.00 4.95 4.95 4.00 4.00 4.00 4.95 4.95 4.00 4.00 4.00 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.00 4.00 4.00 4.95 4.95 3.50 3.50 3.50 4.95 4.95 3.00 3.00 3.00 4.95

4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 3.50 3.00 3.00 3.00 3.50 4.95 4.95 3.00 2.50 2.50 2.50 3.00 4.954.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95 4.95 3.50 3.00 2.50 3.00 2.50 3.00 3.50 4.95 4.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.954.95 4.00 3.50 3.50 3.00 3.50 3.50 4.00 4.95 4.95 3.50 3.00 3.00 2.50 3.00 3.00 3.50 4.95 4.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.954.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95 4.95 3.50 3.00 2.50 3.00 2.50 3.00 3.50 4.95 4.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.95

4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 3.50 3.00 3.00 3.00 3.50 4.95 4.95 3.00 2.50 2.50 2.50 3.00 4.954.95 4.00 4.00 4.00 4.95 4.95 3.50 3.50 3.50 4.95 4.95 3.00 3.00 3.00 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 3.00 3.00 3.00 4.95 4.95 3.00 3.00 3.00 4.95 4.95 3.00 3.00 3.00 4.95

4.95 3.00 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 3.00 4.954.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.954.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.954.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.95

4.95 3.00 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 3.00 4.954.95 3.00 3.00 3.00 4.95 4.95 3.00 3.00 3.00 4.95 4.95 3.00 3.00 3.00 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 3.00 3.00 3.00 4.95 4.95 3.00 3.00 3.00 4.95 4.95 3.00 3.00 3.00 4.95

4.95 3.00 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 3.00 4.954.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.954.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.954.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.95

4.95 3.00 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 3.00 4.954.95 3.00 3.00 3.00 4.95 4.95 3.00 3.00 3.00 4.95 4.95 3.00 3.00 3.00 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 9th Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Page 119: SBF in SMRs - MartJustinR2013

101

This core did not see any significant improvement. Figure 51 shows the axial power

offset and the control rod insertion percentage vs burnup. We can see from Figure 51 that the

control rods do not begin to be withdrawn until 2-3 MWd/Kg, indicating a supercritical core

and a lack of necessary excess reactivity compensation. Furthermore, the trend in axial offset

continues to rapidly swing significantly below 0 before slowly moving up as the control rods

are withdrawn, demonstrating a further lack of poisoning at the bottom of the core.

Figure 51: Axial offset and control rod insertion percentage vs burnup for the 9th core.

The maximum peaking factor vs burnup is shown in Figure 52, where similar trends

from the first group continue. The lack of control rod withdrawal until 2-3 MWd/Kg

demonstrates unfeasible core conditions, and once again as soon as they begin to be

withdrawn we see a sharp rise in peaking factors. Interestingly, they are still in the same

ballpark as a regular core with soluble boron, until the EOC where they gradually rise.

Nevertheless, this specific design is unacceptable due to a supercritical state at BOC.

Additionally, while the peaking factors appear to be low enough to pass design

requirements, the axial offset would still be less than ideal. This is because concentrating more

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

-1

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1

0 5 10 15 20 25 30

Cont

rol R

od In

sert

ion

Perc

enta

ge

Axia

l Pow

er O

ffset

Burnup (MWd/Kg)

Axial Offset (9th Axial Core)

Control Rod Insertion (9th Axial Core)

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102

than 70-80% of your total core power in a handful of axial nodes would make the core more

susceptible to transients that would produce very high peaking factors. If all potential

operating conditions are examined closely, a core with a strong axial offset would be expected

to perform worse than a core with soluble boron and one with a proper axial power profile.

This will be examined in more detail.

Figure 52: Maximum total peaking factor vs burnup for the 9th core.

5.2.2 Further Axially Graded SMR cores from the Second Group

Since all poisons are burned up by the EOC, it seems as though the only hope for

controlling the axial offset at the EOC is to contain the axial offset at the BOC. This would

limit any egregious shielding and shadowing effects that lead to relatively high enriched

assemblies near the top at EOC. In this respect, it is absolutely imperative to control the axial

offset at BOC.

Since the first core in this second group still displayed continued trends in the axial

offset from the first group, subsequent trials in this second group will place low enriched

assemblies at the top of the core with high enriched assemblies at the bottom, to further

influence the axial offset at BOC. Furthermore, low enriched assemblies at the top of the core

1

1.5

2

2.5

3

3.5

4

4.5

0 5 10 15 20 25 30

Max

imum

Pea

king

Fac

tor

Burnup (MWd/Kg)

9th Axial Core

Soluble Boron Core

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103

would reduce the effects the shielding and shadowing effects mentioned above. Each node

still contains a nominal poison load with no individual node containing more than 700 grams

of Gd2O3. The “flat burn” fuel assemblies are still exclusively used, in a continued attempt to

provide a consistent amount of excess reactivity compensation. If these efforts continue to fail,

other strategies will have to be employed.

Figure 53 displays the Gd2O3 load vs core height for each of the 5 axially graded cores

in this group. All 5 cores contain no burnable poisons at the top of the core, and varying

amounts at the bottom, representing different attempts to provide both sufficient excess

reactivity compensation, and to manage the axial power profile. Once again, no core possesses

more than 700 grams of Gd2O3 per axial node.

Figure 53: Burnable poison loading vs core height for the 2nd group of axially graded cores.

Each core’s U235 enrichment vs core height is provided in Figure 54. Here we see the

other adjustment by placing low enriched nodes at the top of the core with high enriched

nodes at the bottom. While this seems counter intuitive if we are seeking to manage the axial

power profile at BOC (when it has consistently been too high), it is likely necessary from an

EOC perspective, where the shielding and shadowing effects produce higher enriched U235 at

0

20

40

60

80

100

120

140

160

180

200

0 100 200 300 400 500 600 700

Core

Hei

ght (

cm)

Gd2O3 Loading (g)

9th Axial Core

10th Axial Core

11th Axial Core

12th Axial Core

13th Axial Core

Page 122: SBF in SMRs - MartJustinR2013

104

the top, driving the axial flux profile toward the top. And since the only mechanism the

engineer has for long-term control of the axial flux profile is U235 enrichment (all poisons will

have depleted by EOC), placing low enriched nodes at the top is justified. It must be counter-

balanced by high enriched nodes at the bottom to provide a contrast between the top and the

bottom of the core.

Figure 54: Average U235 enrichment vs core height for the 2nd group of axially graded cores.

The axial power offset and control rod insertion vs burnup for each core is displayed in

Figures 55 and 56. Here we can see how, once again, there is not enough initial excess

reactivity. Removing poisons from the top of the core was hopefully going to be offset by

lowering the enrichment at the top. However it seems that is not enough, and more reactivity

compensation must be found either through poisons or additional control rods.

Once again there is a general trend of very high initial axial offset (around 0.2-0.4) until

the control rods begin to be withdrawn. At this point it sharply dives to around -0.5 and slowly

rises as the core continues to deplete, ending around 0.6. This large swing is unacceptable, and

there must be additional reactivity compensation to allow for a non-supercritical core at BOC.

0

20

40

60

80

100

120

140

160

180

200

2.50 3.00 3.50 4.00 4.50 5.00

Core

Hei

ght (

cm)

Average Burnup (MWD/KG) Enrichment

9th Axial Core

10th Axial Core

11th Axial Core

12th Axial Core

13th Axial Core

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Figure 55: Axial power offset vs burnup for the 2nd group of axially graded cores.

Figure 56: Control rod insertion for the second group of axially graded cores.

-1

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1

0 5 10 15 20 25 30

Axia

l Pow

er O

ffset

Burnup (MWd/KG)

9th Axial Core

10th Axial Core

11th Axial Core

12th Axial Core

13th Axial Core

0

0.1

0.2

0.3

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Inse

rtio

n Pe

rcen

tage

Burnup (MWd/KG)

8th Axial Core

9th Axial Core

10th Axial Core

11th Axial Core

12th Axial Core

13th Axial Core

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The control rod insertion also displays how cores 11 and 12 produce inconsistent

control rod movement as they both see increased control rod insertion from 5-15 MWd/Kg.

The likely culprit are poisons that provide a lot of initial reactivity compensation, but quickly

burn out, placing additional burden on control rods for excess reactivity compensation. This

type of fuel assembly was outlined in Section 4.3.2, and the specific fuel assemblies used in

cores 11 and 12 are shown in Figure 57.

Figure 57: kinf vs burnup for fuel assemblies used in cores 11 and 12.

Maximum peaking factors for this 2nd group of axially graded cores is shown in Figure

58. Except for cores 11 and 12, they behave in a similar fashion to the first group of axially

graded cores. For cores 11 and 12, we see a very large spike in peaking factors, coinciding

with the increased control rod insertion around 15 MWd/Kg.

While the control rod movement coincides nicely with the spike, there is another factor

at play that has a larger influence on these egregious peaking factor spikes. One should note

that the control rods were inserted to a similar depth at BOC, yet without such massive

peaking factors. However, at BOC the large concentration of Gd2O3 suppressed the neutron

flux at bottom of the core, where there are no control rods to suppress the neutron flux. The

Gd2O3 plays the role of control rods, helping to suppress the flux. However, they quickly burn

0.7

0.8

0.9

1

1.1

1.2

1.3

0 5 10 15 20 25

K inf

Burnup (MWd/Kg)

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107

out, which coincidentally results in additional control rod insertion. Around 15 MWd/Kg, all

the Gd2O3 has been depleted, and the bottom of the core contains no active reactivity

suppression – leading to the peaking factor spike. Later axially graded cores should not

employ quickly depleting burnable poisons at the bottom of the core to avoid this effect.

Figure 58: Maximum total peaking factor vs burnup for the second group of cores.

5.3 Third Group of Axially Graded SMR Cores

5.3.1 First Core from Third Group of Axially Graded SMR Cores

The first two groups of axially graded cores suffered from a common problem: not

enough initial excess reactivity compensation and not enough reactivity compensation at the

bottom of the core to combat the axial power offset. The axial power offset in specific

continued to be very low until around 15 MWd/Kg, when the control rods are far enough

withdrawn to produce a slow, steady rise. To combat these effects, and to investigate the limits

of effectiveness for burnable poisons placed in the bottom of the core, this 3rd group of axially

graded control rods explored the idea of significant burnable poison loading at the bottom of

the core. The overall strategy employed for this group of cores is summarized below:

1

3

5

7

9

11

13

0 5 10 15 20 25 30

Max

imum

Pea

king

Fac

tor

Burnup (MWd/Kg)

8th Axial Core9th Axial Core10th Axial Core11th Axial Core12th Axial Core13th Axial Core

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108

• Nominal poisoning throughout the middle at top of the core, with significant poison

loading at the bottom of the core. The idea is to both provide additional excess

reactivity compensation, and to combat the axial power offset.

• High enriched U235 at the bottom and top of the core for a longer core lifetime. The

massive loading of burnable poisons should offset this increase in enrichment.

• Radial U235 enrichment loading that follows general guidelines from section 4.1

• Non poisoned 4.95% enriched assemblies at the outer edge of the core to combat

neutron leakage

The specific fuel assemblies used in this group of cores provide strong initial reactivity

compensation with either a slow or medium rate of depletion. They come from Section 4.3.3,

and Figure 59 displays kinf vs burnup for these fuel assemblies.

Figure 59: kinf vs burnup for fuel assemblies used in the third group of cores.

Figure 60 shows the burnable poison loading and the average U235 enrichment vs core

height for the 14th axially graded core – the first one from this 3rd group of axially graded

cores. There are a few notable changes. First, there is a nominal level of poisoning throughout

the core, with a very large increase in poisons in the bottom 3 nodes, which contain just under

2000 grams of Gd2O3 per node. Second, the U235 enrichment in each assembly has been

0.4

0.5

0.6

0.7

0.8

0.9

1

1.1

1.2

1.3

0 5 10 15 20 25 30

K inf

Burnup (MWd/Kg)

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109

increased; most notably in the top of the core which now contains higher enriched assemblies.

The goal is to increase core lifetime, which is now thought possible through the increased

Gd2O3 loading throughout the core.

Figure 60: Burnable poison loading and average U235 enrichment vs core height for the first core in the third group of axially graded cores.

Figures 61 and 62 show the individual Gd2O3 loading and U235 enrichment for each

assembly in each axial node.

3.00 3.20 3.40 3.60 3.80 4.00 4.20 4.40 4.60 4.80 5.00

0

20

40

60

80

100

120

140

160

180

200

0

20

40

60

80

100

120

140

160

180

200

0 200 400 600 800 1000 1200 1400 1600 1800 2000

Average Burnup (MWD/KG) Enrichment

Core

Hei

ght (

cm)

Gd2O3 Loading (g)

14th Axial Core - BP Loading (g)

14th Axial Core - U235 Enrichment

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110

Figure 61: Average burnable poison loading (grams) per node for the 14th core.

0 0 0 0 0 0 0 0 00 32.92 32.92 32.92 0 0 32.92 32.92 32.92 0 0 32.92 32.92 32.92 0

0 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 00 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 32.92 32.92 00 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 32.92 32.92 00 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0

0 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 00 32.92 32.92 32.92 0 0 32.92 32.92 32.92 0 0 32.92 32.92 32.92 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 32.92 32.92 32.92 0 0 0 9.603 0 0 0 0 9.603 0 0

0 32.92 32.92 32.92 32.92 32.92 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 32.92 32.92 32.92 32.92 32.92 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 32.92 32.92 32.92 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 11.32 0 11.32 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 14th Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 16: 120-128 cm

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111

Figure 62: Assembly U235 enrichment per node for the 14th core.

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 2.50 3.00 2.50 4.95 4.95 2.50 3.00 2.50 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 4.954.95 4.95 4.95 4.95 4.95 4.95 2.50 3.00 2.50 4.95 4.95 2.50 3.00 2.50 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 2.50 3.00 2.50 4.95 4.95 2.50 3.00 2.50 4.95 4.95 2.50 3.00 2.50 4.95

4.95 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 4.954.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 4.954.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.95 4.95 3.00 2.50 2.50 2.50 2.50 2.50 3.00 4.954.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 4.95

4.95 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 4.95 4.95 2.50 2.50 2.50 2.50 2.50 4.954.95 2.50 3.00 2.50 4.95 4.95 2.50 3.00 2.50 4.95 4.95 2.50 3.00 2.50 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.00 4.00 4.00 4.95 4.95 4.00 4.00 4.00 4.95 4.95 4.00 4.00 4.00 4.95

4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.50 4.00 4.954.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95 4.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95 4.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.954.95 4.00 3.50 3.50 3.00 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.00 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.00 3.50 3.50 4.00 4.954.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95 4.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95 4.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95

4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.50 4.00 4.954.95 4.00 4.00 4.00 4.95 4.95 4.00 4.00 4.00 4.95 4.95 4.00 4.00 4.00 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.00 4.00 4.00 4.95 4.95 4.00 4.00 4.00 4.95 4.95 4.00 4.00 4.00 4.95

4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.50 4.00 4.954.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95 4.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95 4.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.954.95 4.00 3.50 3.50 3.00 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.00 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.00 3.50 3.50 4.00 4.954.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95 4.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95 4.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95

4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.50 4.00 4.954.95 4.00 4.00 4.00 4.95 4.95 4.00 4.00 4.00 4.95 4.95 4.00 4.00 4.00 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.00 4.00 4.00 4.95 4.95 4.00 4.00 4.00 4.95 4.95 4.00 4.00 4.00 4.95

4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.50 4.00 4.954.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95 4.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95 4.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.954.95 4.00 3.50 3.50 3.00 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.00 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.00 3.50 3.50 4.00 4.954.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95 4.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95 4.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95

4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 4.00 3.50 3.50 3.50 4.00 4.954.95 4.00 4.00 4.00 4.95 4.95 4.00 4.00 4.00 4.95 4.95 4.00 4.00 4.00 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.00 4.00 4.00 4.95 4.95 4.50 4.00 4.50 4.95 4.95 4.50 4.00 4.50 4.95

4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 4.50 3.50 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 3.50 4.50 4.954.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95 4.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.954.95 4.00 3.50 3.50 3.00 3.50 3.50 4.00 4.95 4.95 4.00 3.50 4.00 3.00 4.00 3.50 4.00 4.95 4.95 4.00 3.50 4.00 3.00 4.00 3.50 4.00 4.954.95 4.00 3.50 3.00 3.50 3.00 3.50 4.00 4.95 4.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.95

4.95 4.00 3.50 3.50 3.50 4.00 4.95 4.95 4.50 3.50 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 3.50 4.50 4.954.95 4.00 4.00 4.00 4.95 4.95 4.50 4.00 4.50 4.95 4.95 4.50 4.00 4.50 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.50 4.00 4.50 4.95 4.95 4.50 4.00 4.50 4.95 4.95 4.50 4.00 4.50 4.95

4.95 4.50 3.50 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 3.50 4.50 4.954.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 4.50 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 4.50 3.50 3.50 4.50 4.954.95 4.00 3.50 4.00 3.00 4.00 3.50 4.00 4.95 4.95 4.00 3.50 4.50 3.00 4.50 3.50 4.00 4.95 4.95 4.00 3.50 4.50 3.00 4.50 3.50 4.00 4.954.95 4.50 3.50 3.50 4.00 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 4.50 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 4.50 3.50 3.50 4.50 4.95

4.95 4.50 3.50 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 3.50 4.50 4.95 4.95 4.50 3.50 3.50 3.50 4.50 4.954.95 4.50 4.00 4.50 4.95 4.95 4.50 4.00 4.50 4.95 4.95 4.50 4.00 4.50 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 14th Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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112

The behavior of this core is shown in Figure 63. Despite the increased burnable poison

loading, the very beginning of the cycle still has no control rod withdrawal, once again

indicating a supercritical core. Nevertheless, this is an improvement from previous cores

which did not see control rod withdrawal until 3-4 MWd/Kg.

On the other hand, there is little to no improvement in the shape of the axial power

offset vs burnup, even though the bottom of the core had around 2000 grams of Gd2O3 per

node. This issue will have to be addressed in future cores in this 3rd group of axially graded

cores.

Figure 63: Axial offset and control rod insertion percentage vs burnup for the 14th core.

The maximum peaking factors vs burnup (Figure 64) show a similar trend: increased

peaking at the BOC, and a slight, steady rise from 15 MWd/Kg to the end of the core lifetime.

Considering the peaking factors alone, these would be acceptable. But as previously discussed,

the infeasible core conditions (supercriticality at BOC) and the nature of the axial power offset

bring undesired side effects, and drive the search for a better configuration.

0

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0.5

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-0.8

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Cont

rol R

od In

sert

ion

Perc

enta

ge

Axia

l Pow

er O

ffset

Burnup (MWd/Kg)

Axial Offset (14th Axial Core)

Control Rod Insertion (14th AxialCore)

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113

Figure 64: Maximum total peaking factor vs burnup for the 14th core and a soluble boron core.

5.3.2 Further Axially Graded SMR cores from the Third Group

Since the first core in this group was supercritical at BOC, and still developed an

unacceptable axial power profile throughout depletion, subsequent cores will focus on further

increasing the burnable poison loading at the bottom of the core. The middle and top of the

core maintain an consistent Gd2O3 loading profile, as does the U235 enrichment loading

pattern, since the primary goal for this 3rd group of cores seeks to ultimately determine the

impact from heavily poisoning the bottom of the core. If no core from this group meets the

design specifications, then further groups of cores will alter the Gd2O3 loading throughout the

core and the U235 enrichment loading pattern, among other considerations. Figures 65 and 66

display the burnable poison load and the average U235 enrichment vs core height.

1

1.5

2

2.5

3

3.5

4

4.5

0 5 10 15 20 25 30

Max

imum

Pea

king

Fac

tor

Burnup (MWd/Kg)

14th Axial Core

Soluble Boron Core

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114

Figure 65: Burnable poison loading vs core height for the third group of cores.

Figure 66: Average U235 enrichment vs core height for the third group of cores.

0

20

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80

100

120

140

160

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0 1000 2000 3000 4000 5000 6000

Core

Hei

ght (

cm)

Gd2O3 Loading (g)

14th Axial Core

15th Axial Core

16th Axial Core

17th Axial Core

18th Axial Core

19th Axial Core

20th Axial Core

21st Axial Core

22nd Axial Core

0

20

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2.5 3 3.5 4 4.5 5

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Hei

ght (

cm)

Average Burnup (MWD/KG) Enrichment

14th Axial Core

15th Axial Core

16th Axial Core

17th Axial Core

17th Axial Core

18th Axial Core

19th Axial Core

20th Axial Core

21st Axial Core

22nd Axial Core

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115

As seen in Figures 67 and 68, increasing the Gd2O3 loading in the bottom of the core

did not impact the axial offset profile in any significant way. Some cores even demonstrated

increased supercriticality at the BOC. This behavior demonstrates that simply altering 3 axial

nodes has a minimal impact on the overall behavior of the core, even if they are poisoned to an

extreme level (5000 grams of Gd2O3).

Interestingly, while the bottom 3 nodes provide a strong impact on the neutron flux, the

overall axial flux still dives to around -0.4. While this is a small improvement from previous

cores, the overall shape of the axial offset remains the same, along with the similar steady

increase up until the end of cycle. Further axial cores will have to provide a more uniform plan

of attack and provide increased poisoning throughout the bottom of the core. Further altering

the U235 enrichment loading should also be considered.

Figure 67: Axial power offset vs burnup for the third group of cores.

-1

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

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0 5 10 15 20 25 30

Axia

l Pow

er O

ffset

Burnup (MWd/Kg)

14th Axial Core

15th Axial Core

16th Axial Core

17th Axial Core

18th Axial Core

19th Axial Core

20th Axial Core

21st Axial Core

21st Axial Core

22nd Axial Core

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116

Figure 68: Control rod insertion vs burnup for the third group of cores.

As Figure 69 shows, the maximum peaking factors are also minimally affected. They

retain the similar profile of increased factors at the BOC, along with the steady rise up until

the EOC. Based on the similar axial offset and control rod behavior, this is expected.

0

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Inse

rtio

n Pe

rcen

tage

Burnup (MWd/Kg)

14th Axial Core15th Axial Core16th Axial Core18th Axial Core19th Axial Core20th Axial Core21st Axial Core22nd Axial Core

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Figure 69: Maximum total peaking factor vs burnup for the third group of cores.

5.3 Fourth Group of Axially Graded SMR Cores

The first three groups continued to suffer from similar problems. Namely, insufficient

initial excess reactivity compensation and an unacceptable axial power profile throughout

burnup. It has been determined that simply overloading the bottom of the core with very

strong burnable poisons does not adequately address these issues, pointing to the need for a

more uniform poison profile throughout the bottom of the core.

Additionally, the lack of initial excess reactivity can be partially attributed to the 20 fuel

assemblies on the outer edge of the core that contain 4.95% U235 enriched and non-poisoned

assemblies. Even though they sit at the outer edge of the core where leakage effects tend to

dominate, the 20 total fuel assemblies constitute 35% of the total fuel assemblies in the core.

The lack of adequate results in the first three groups suggests changing these outer assemblies

to contain lower U235 enrichment, increased poisons, or both.

1

1.5

2

2.5

3

3.5

4

4.5

5

0 5 10 15 20 25 30

Max

imum

Pea

king

Fac

tor

Burnup (MWd/KG)

14th Axial Core 15th Axial Core

16th Axial Core 17th Axial Core

18th Axial Core 19th Axial Core

20th Axial Core 21st Axial Core

22nd Axial Core

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118

Furthermore, the continued axial power offset profile that slowly rises to unacceptably

high levels at EOC suggests returning to lower enriched assemblies at the top of the core.

Shielding and shadowing effects will likely still produce some amount of relatively higher

enriched assemblies at the top of the core at EOC, but lowering the initial U235 enrichment at

the top can blunt this effect.

In sum, this group of cores will employ the following strategies:

• Low 2.50% U235 enriched and nominally poisoned at the outer edge of the core to

reduce the initial excess reactivity requirements and contribute toward a proper axial

power profile.

• Nominal poisoning throughout the bottom of the core, with non-poisoned assemblies

at the top of the core to provide a more uniform poison profile where necessary.

• High enriched U235 at the bottom and top of the core for a longer core lifetime,

balanced by low enriched assemblies at the top. The burnable poisons at the bottom of

the core, coupled with lower enriched assemblies in the outer ring should offset this

increase in enrichment.

• Radial U235 enrichment loading that follows general guidelines from section 4.1 where

possible.

5.3.1 First core from Fourth group of axially graded SMR cores

The first core from this group is detailed in Figure 70, where the lower enrichment and

non-poisoned assemblies at the top of the core are balanced by the high enriched and

nominally poisoned assemblies at the bottom of the core.

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119

Figure 70: Burnable poison loading and average U235 enrichment vs core height for the 23rd core.

The fuel assemblies used in this group of cores contain a mix of various types of fuel

assemblies. Most notably, use of mid-to-strong poisoned assemblies that deplete both slow

and quick. Coupling these different types of fuel assemblies together is aimed toward

providing enough long-term reactivity compensation to battle axial power offset throughout

the middle of the cycle, while still providing adequate but not overwhelming poisoning

throughout the BOC. Figure 71 provides a snapshot of a few of the different fuel assemblies

used.

3.00 3.20 3.40 3.60 3.80 4.00 4.20 4.40 4.60 4.80 5.00

0

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200

0

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0 50 100 150 200 250 300 350 400 450 500

Average Burnup (MWD/KG) Enrichment

Core

Hei

ght (

cm)

Gd2O3 Loading (g)

23rd Axial Core - BP Loading (g)

23rd Axial Core - U235 Enrichment

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120

Figure 71: kinf vs burnup for the fuel assemblies used in the fourth group of cores.

Figure 72 and 73 show the detailed burnable poison and U235 enrichment composition

for each fuel assembly in each node. Notice the outer ring of assemblies, where the top of the

core contains non-poisoned 2.50% U235, while the bottom of the core contains nominally

poisoned 4.95% U235. Additionally, the burnable poisons extend into the top half of the core to

provide uniform initial excess reactivity compensation.

0.6

0.7

0.8

0.9

1

1.1

1.2

0 5 10 15 20 25 30

K inf

Burnup (MWd/Kg)

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Figure 72: Average burnable poison loading (grams) per node for the 23rd core.

5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.4875.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487

5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.4875.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.4875.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.4875.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487

5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.4875.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487

5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487

5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.4875.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487

5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.4875.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.4875.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.4875.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487

5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.4875.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487

5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487

5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.4875.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487

5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.4875.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.4875.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.4875.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487

5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.4875.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487

5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487

0 0 0 0 0 0 0 0 00 4.801 4.801 4.801 0 0 4.801 4.801 4.801 0 0 4.801 4.801 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 4.801 7.545 9.603 9.603 9.603 7.545 4.801 0 0 4.801 7.545 9.603 9.603 9.603 7.545 4.801 0 0 4.801 7.545 9.603 9.603 9.603 7.545 4.801 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 4.801 4.801 0 0 4.801 4.801 4.801 0 0 4.801 4.801 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 4.801 4.801 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 4.801 7.545 9.603 9.603 9.603 7.545 4.801 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 4.801 4.801 4.801 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 23rd Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

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Figure 73: Fuel assembly U235 enrichment per node for the 23rd core.

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 23rd Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

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The axial offset and control rod movement throughout depletion for this core is detailed

in Figure 74 below. There is finally enough initial excess reactivity compensation to engage

the control rods right away, signifying a critical core at BOC. The control rods remain around

90% inserted until around 7 MWd/Kg, showing how the burnable poison depletion matches

the overall depletion of the core. At 7 MWd/Kg the depletion of the core outpaces the

depletion of Gd2O3, and less reactivity compensation is required from control rods, resulting in

a slow withdrawal until EOC.

Unfortunately, the strong 90% insertion of control rods results in the bottom 10% of the

core experiencing relatively high neutron flux levels. This contributes heavily to a strongly

negative axial power offset profile at BOC. And due to a strong negative axial power profile,

U235 in the bottom of the core depletes faster than the top of the core, once again resulting in a

slow rise to the axial power profile throughout the middle and end of the cycle.

Figure 74: Axial offset and control rod insertion vs burnup for the 23rd core.

0

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Cont

rol R

od In

sert

ion

Perc

enta

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Axia

l Pow

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ffset

Burnup (MWd/Kg)

Axial Offset (23rd Axial Core)

Control Rod Insertion (23rd Axial Core)

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The peaking factors for this core (Figure 75) demonstrate how deep control rod

insertion at BOC results in extremely high peaking factors. The difference between this core

and earlier cores, which also saw deep control rod insertion around the BOC, is the lack of

strong burnable poisons at the bottom of the core. This core contained only nominal

poisoning, with the bottom 9 nodes loaded with less than 500 grams of Gd2O3. The peaking

factors return to acceptable levels once the control rods begin to withdrawal, indicating hope

for a feasible core (one that is not supercritical at BOC like previous cores) that provides

adequate peaking factors. However, the poor axial flux profile still shows room for significant

improvement.

Figure 75: Maximum total peaking factor vs burnup for the 23rd core and a soluble boron core.

5.3.2 Further Axially Graded SMR cores from the Fourth Group

The first core experienced a few problems arising from deep control rod insertion at

BOC. To combat this, increased overall reactivity compensation would drive the control rods

to be further withdrawn at the BOC. Couple that with further poisoning the outer ring of fuel

1

2

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4

5

6

7

8

9

10

11

0 5 10 15 20 25 30

Max

imum

Pea

king

Fac

tor

Burnup (MWD/KG)

23rd Axial Core

Soluble Boron Core

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125

assemblies at the bottom of the core, and improvements could be realized. Therefore, this

group of cores focuses on increasing the burnable poison loading throughout the bottom of the

core, along with mixing different types of fuel assemblies to change the overall Gd2O3

depletion profile (i.e., providing more initial reactivity compensation at the expense of a quick

depletion, or less initial reactivity compensation while providing a longer Gd2O3 lifetime).

The strategies outlined above are evidenced in figures 76 and 77 below, which show the

variations in Gd2O3 loading and U235 enrichment vs core height for each of the 7 cores in this

group. The burnable poison loading at the bottom of the core was slowly increased, reaching a

maximum of around 700 grams Gd2O3 per node, while the U235 enrichment stayed constant

throughout all 7 cores.

Figure 76: Burnable poison loading vs core height for the fourth group of cores.

0

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0 100 200 300 400 500 600 700 800

Core

Hei

ght (

cm)

Gd2O3 Loading (g)

23rd Axial Core

24th Axial Core

25th Axial Core

26th Axial Core

27th Axial Core

28th Axial Core

29th Axial Core

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Figure 77: Average U235 enrichment vs core height for the fourth group of cores.

The rest of the cores from group 4 unfortunately did not fare much better than the first

core. While all 7 cores demonstrated adequate initial reactivity compensation, it appears as

though increasing the Gd2O3 concentration in the bottom half of the core did not provide any

long-term stability to the axial power offset profile (Figure 78). By 10 MWd/Kg, there is little

discernable difference between any of the different cores. A more radical adjustment must be

made, either to Gd2O3 loading or to the U235 enrichment, or both.

0

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200

2.5 3 3.5 4 4.5 5

Core

Hei

ght (

cm)

Average Burnup (MWD/KG) Enrichment

23rd Axial Core

24th Axial Core

25th Axial Core

26th Axial Core

27th Axial Core

28th Axial Core

29th Axial Core

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127

Figure 78: Axial power offset vs burnup for the fourth group of cores.

Meanwhile, we can clearly see from the control rod insertion vs burnup graph (Figure

79), that increasing the burnable poison loading at the bottom of the core does have an impact

of the control rod insertion depth. Unfortunately, it only delays the inevitable re-insertion of

control rods when the Gd2O3 depletes. The 29th overall core displays good poisoning at the

bottom of the core, keeping the control rods at just over 50% insertion. Unfortunately when

the Gd2O3 depletes, the control rods are once again inserted close to 90%. There is a clear

need for long-term and long-lasting Gd2O3 poisoning if any adequate axial power profile is to

be established.

-1

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Axia

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ffset

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23rd Axial Core

24th Axial Core

25th Axial Core

26th Axial Core

27th Axial Core

28th Axial Core

29th Axial Core

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Figure 79: Control rod insertion vs burnup for the fourth group of cores.

The peaking factors (Figure 80) for the remaining 6 cores in this 4th group show a

similar trend to what was found in the 1st core in this 4th group. As the first core displayed a

strong peaking factor spike at BOC, the other 6 cores in this group also show a strong spike,

just slightly delayed, depending upon the amount of Gd2O3 loading in the bottom of the core.

Every core displayed a strong peak, which again arises due to the lack of poisoning in the

bottom of the core when the control rods are re-inserted to around 90%. This leaves the

bottom 10% of the core completely unsuppressed and exposed to very high neutron flux levels

(and a strong negative axial offset as well). Any improvements will have to come from longer-

lasting burnable poisons throughout the bottom of the core.

0

0.1

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0.3

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0.7

0.8

0.9

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0 5 10 15 20 25 30

Inse

rtio

n Pe

rcen

tage

Burnup (MWd/KG)

23rd Axial Core

24th Axial Core

25th Axial Core

26th Axial Core

27th Axial Core

28th Axial Core

29th Axial Core

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Figure 80: Maximum total peaking factor vs burnup for the fourth group of cores.

5.5 Fifth Group of Axially Graded SMR Cores

The fourth group of cores performed better than previous groups in terms of both the

axial power profile throughout the lifetime of the core, and in the initial amount of excess

reactivity. However, the axial power profile continued to suffer from a strong negative value

around 10 MWd/Kg and slowly rising to a very strong positive value at the EOC. The likely

culprit for such behavior lies in the inability to provide burnable poisons that last throughout

the middle of the cycle. The presence of burnable poisons does an adequate job in controlling

the axial power profile at the BOC, but even the fuel assemblies that contain relatively longer

lasting poisons still deplete too quickly to continue to control the axial offset into MOC.

In an attempt to fix these issues, this group of cores will use the fuel assemblies that

contain the longest lasting burnable poisons. These fuel assemblies are detailed in Figure 81

below, which also contain strong initial poisoning. In order to provide enough poisoning at the

1

3

5

7

9

11

13

0 5 10 15 20 25 30

Max

imum

Pea

king

Fac

tor

Burnup (MWd/KG)

23rd Axial Core

24th Axial Core

25th Axial Core

26th Axial Core

27th Axial Core

28th Axial Core

29th Axial Core

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bottom of the core around MOC to control the axial power profile, a relatively large number of

these fuel assemblies must be used, since the poisons have depleted by over 50% of their

original strength by 10 MWd/Kg. This has the unintentional byproduct of potentially creating

a core that contains more poisons than necessary at BOC. But this effect would only result in

the control rods being inserted less, which would in turn provide a lower impact on the axial

power profile. Therefore with this strategy, it is expected to see a positive axial power offset at

BOC in order to create a manageable power profile at MOC and EOC.

Figure 81: kinf vs burnup for fuel assemblies used in the fifth group of cores.

In sum, the following strategies will be employed in this 5th group of axially graded

cores:

• Low 2.50% U235 enriched and nominally poisoned assemblies at the outer edge of the

core to reduce the initial excess reactivity requirements and contribute toward a proper

axial power profile.

• Fuel assemblies that provide strong initial poisons and slow depletion at the bottom of

the core to provide long-term control of the axial power profile.

• Non-poisoned assemblies at the top of the core to reduce the propensity toward

strongly positive axial power offset at EOC.

0.6

0.7

0.8

0.9

1

1.1

1.2

0 2 4 6 8 10 12 14 16 18 20

K inf

Burnup (MWd/Kg)

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131

• High enriched U235 at the bottom and top of the core for a longer core lifetime,

balanced by low enriched assemblies at the top. The high enriched assemblies at the

bottom also provide a counterbalance to the positive axial power offset at EOC.

• Radial U235 enrichment loading that follows general guidelines from section 4.1 where

possible.

5.5.1 First Core from Fifth Group of Axially Graded Cores

The first core from this fifth group implements the above strategies by increasing the

overall Gd2O3 loading in the bottom of the core from the fuel assemblies provided in Figure

82. Figure 83 demonstrates this increase, where the bottom 10 axial nodes contain 900 grams

of Gd2O3.

Figure 82: Burnable poison loading and average U235 enrichment vs core height for the 30th core.

3.00 3.20 3.40 3.60 3.80 4.00 4.20 4.40 4.60 4.80 5.00

0

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0 100 200 300 400 500 600 700 800 900 1000

Average Burnup (MWD/KG) Enrichment

Core

Hei

ght (

cm)

Gd2O3 Loading (g)

30th Axial Core - BP Loading (g)

30th Axial Core - U235 Enrichment

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The exact loading arrangement for Gd2O3 and U235 in this first core is detailed in Figure

83 and 84. The other cores from this fifth group follow a similar loading arrangement as this

first core, with nominal differences from one core to the next. As can be seen, the poisoning

abruptly stops at the 10th node. The purpose is to provide strong reactivity compensation

throughout the bottom of the core to offset the partial insertion of control rods. The top of the

core contains no poisons in an attempt to reduce the positive axial offset at the EOC that every

previous core has demonstrated. If the top of the core is not poisoned and contains low U235

enrichment, then every attempt is given to create a manageable axial offset at EOC.

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Figure 83: Average burnable poison loading (grams) per node for the 30th core.

16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.4616.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46

16.46 14.4 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 14.4 16.4616.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.4616.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.4616.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46

16.46 14.4 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 14.4 16.4616.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46

16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.46

16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.4616.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46

16.46 14.4 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 14.4 16.4616.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.4616.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.4616.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46

16.46 14.4 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 14.4 16.4616.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46

16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.46

16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.4616.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46

16.46 14.4 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 14.4 16.4616.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.4616.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.4616.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46

16.46 14.4 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 14.4 16.4616.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46

16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.46

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 30th Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

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Figure 84: Fuel assembly U235 enrichment per node for the 30th core.

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 30th Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

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135

Depletion of this first core resulted in the axial offset and control rod insertion vs

burnup graph provided in Figure 85. The strategy of increasing the amount of poisons at the

bottom of the core does provide a better axial power profile at BOC, but slowly decreases to a

very low value of -0.9 at 15 MWd/Kg. In this instance, over 90% of the power is being

produced in the bottom half of the core, despite the control rods only being 60% inserted.

Thus, while improvements are realized at BOC, this core is still unable to contain the axial

offset into MOC.

Figure 85: Axial offset and control rod insertion vs burnup for the 30th core.

Considering the continuing issues in the axial offset and control rod insertion, the

peaking factors also continue the general trends seen in the fourth group of axial cores (Figure

86). As the axial offset slowly declines throughout BOC and into MOC, the peaking factors

slowly rise, reaching a peak at 15 MWd/Kg where over 90% of the total core power is being

produced in the bottom half of the core. Future cores in this fifth group will have to better

address the MOC axial offset through the increased use of long-term burnable poisons.

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

-1

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1

0 5 10 15 20 25 30

Cont

rol R

od In

sert

ion

Perc

enta

ge

Axia

l Pow

er O

ffset

Burnup (MWd/Kg)

Axial Offset (30th Axial Core)

Control Rod Insertion (30th Axial Core)

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136

Figure 86: Maximum total peaking factor vs burnup for the 30th core.

5.5.2 Further Axially Graded SMR Cores from the Fifth Group

The rest of the cores from this fifth group continue to increase the burnable poison

loading in the bottom half of the core in an attempt to control the axial power profile

throughout MOC. Figure 87 shows how the total Gd2O3 loading changed from one core to the

next. Additional changes occurred through altering the type of fuel assemblies used, with later

cores in this 5th group utilizing the longest lasting Gd2O3 fuel assemblies.

Figure 87: Burnable poison loading vs core height for the fifth group of cores.

1

2

3

4

5

6

7

8

0 5 10 15 20 25 30

Max

imum

Pea

king

Fac

tor

Burnup (MWD/Kg)

30th Axial Core

Soluble Boron Core

0

20

40

60

80

100

120

140

160

180

200

0 500 1000 1500 2000 2500 3000

Core

Hei

ght (

cm)

Gd2O3 Loading (g)

30th Axial Core31st Axial Core32nd Axial Core33rd Axial Core34th Axial Core35th Axial Core

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137

As can be seen in figure 88, the enrichment loading arrangement did not change at all

from one core to the next. While a lot of emphasis is being placed on controlling the axial

power profile throughout BOC and MOC, the enrichment scheme still contains high enriched

assemblies at the bottom with low enriched assemblies at the top. As explained earlier, by

itself this enrichment loading scheme is counter intuitive with respect to controlling the axial

offset at BOC, since the axial power profile has seen far too much power being produced in

the bottom half of the core. Placing high enriched assemblies at the bottom will only create a

further propensity for increased power production.

However, the EOC has routinely seen high axial offset values due to shielding and

shadowing effects. The only mechanism the reactor engineer has to control the EOC power

profile is through axially grading the U235 enrichment, since all Gd2O3 will have depleted by

the EOC. In this manner, using low enriched assemblies at the top aims to reduce the axial

offset at the EOC, while the high enriched assemblies at the bottom of the core can be offset

by including strong burnable poisons.

Figure 88: Average U235 enrichment vs core height for the fifth group of cores.

0

20

40

60

80

100

120

140

160

180

200

2.5 3 3.5 4 4.5 5

Core

Hei

ght (

cm)

Average Burnup (MWD/KG) Enrichment

30th Axial Core

31st Axial Core

32nd Axial Core

33rd Axial Core

34th Axial Core

35th Axial Core

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138

Figure 89 displays the axial power offset vs burnup for the cores in this fifth group. As

can be seen, improvements have been realized for the BOC, up until around 5 MWd/Kg,

where each core dramatically differs from each other. As a general trend, increasing the Gd2O3

loading at the bottom of the core results in an improved axial offset profile throughout the

BOC. However, increasing the loading too much (beyond 700 grams) tends to create some

dramatic effects. Namely, core 33 and 34 possess a much shorter core lifetime, while core 32

has a lot of instability around 15 MWd/Kg, right as the Gd2O3 has completely depleted.

Figure 89: Axial power offset vs burnup for the fifth group of cores.

-1

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1

0 5 10 15 20 25 30

Axia

l Pow

er O

ffset

Burnup (MWd/Kg)

30th Axial Core 31st Axial Core

33rd Axial Core 34th Axial Core

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139

Figure 90: Control rod insertion vs burnup for the fifth group of cores.

Looking specifically at cores 33 and 34, the abrupt increase in poison loading

throughout the bottom 9 axial nodes to 1856 grams of Gd2O3 created too much reactivity

suppression. The control rods engage just beyond 50% insertion at BOC, and are slowly

removed until 13-14 MWd/Kg, when the core goes subcritical, indicating the end of its cycle.

While a lot of reactivity is still left in the bottom half of the core (where there are 4.95% U235

enriched assemblies), the strong poisoning still leaves this part of the core too suppressed to

contribute. This is reflected in the low power levels at the bottom of the core, contributing to

the high axial offset values at 13 MWd/Kg. Figure 91 demonstrates this effect through the

relative power fraction, kinf, and average core exposure vs core height at EOC (11 MWd/Kg of

average core exposure, just before core 34 goes subcritical).

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

0 5 10 15 20 25 30

Inse

rtio

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rcen

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Burnup (MWd/Kg)

30th Axial Core

31st Axial Core

33rd Axial Core

34th Axial Core

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Figure 91: Relative power fraction and average exposure at 11 MWd/Kg for core 34.

The average exposure demonstrates the limited burnup in the bottom half of the core,

where nodes 1-6 all possess an average exposure of less than 1 MWd/Kg. Appropriately, the

middle of the core sees a dramatic spike in exposure, peaking at 25 MWd/Kg in node 13. The

middle of the core is non-poisoned with nominally enriched 3.25% U235 assemblies, which

both contribute to the large peak. Furthermore, beyond 5 MWd/Kg of average total core

exposure, the control rods no longer inhabit the middle of the core, leaving this part of the core

completely non-poisoned. Appropriately, these cores experience relatively large exposures,

and quickly deplete.

The relative power fraction vs core height at 11 MWd/Kg of total core exposure tells a

similar story. Right before the core goes subcritical, the top of the core shoulders most of the

power production, with negligible power production in the bottom of the core. This leads to

the shortened lifetime.

Clearly, the bottom of the core contains too much Gd2O3 in cores 33 and 34. The other

cores in this group do not contain such drastic poisoning at the bottom of the core, which is

reflected in the longer core lifetime. Unfortunately, the same familiar axial offset curve is

displayed. While the axial offset is closer to zero at BOC, it quickly dives negative before

slowly climbing to a peak at EOC. The use of the fuel assemblies with long burnable poison

lifetimes still did not create adequate poisoning throughout the MOC.

0

5

10

15

20

25

0 0.5 1 1.5 2 2.5

Axia

l Nod

e

Relative Power Fraction

0

5

10

15

20

25

0 10 20 30

Axia

l Nod

e

Average Exposure (MWd/Kg)

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Figure 92: Maximum total peaking factor vs burnup for the fifth group of cores.

Figure 92 displays the maximum peaking factors for this group of cores. Once again a

few peaks were encountered, specifically for cores 30-32 around 15-20 MWd/Kg. Looking

back at the control rod insertion vs burnup (Figure 90), cores 30-32 did not possess a smooth

and consistent removal of control rods. For these three cores, the control rods were re-inserted

at some point, when the Gd2O3 depletion outpaced the U235 depletion and an increase in excess

reactivity compensation was required. This additional compensation had to come from the

control rods, and their further insertion resulted in a smaller area of the core that contained no

neutron poisons at all (since at this point all Gd2O3 has been depleted). As the control rods

were re-inserted, these non-poisoned areas experienced dramatic increases in the neutron flux,

and thereby also in power production.

This effect coincided with a sharp rise in the maximum peaking factor. Appropriately, if

the control rods are being withdrawn slowly and smoothly, and then begin to be re-inserted, it

must be due to an addition of positive reactivity. And since no U235 is being physically added

to the core in the middle of the cycle (nor any other physical additions of positive reactivity in

normal operations), this additional reactivity must be a result of Gd2O3 depletion that outpaces

the natural depletion of U235 in the core itself. By the time this effect results in control rod re-

1

3

5

7

9

11

13

0 5 10 15 20 25 30

Max

imum

Pea

king

Fac

tor

Burnup (MWd/Kg)

30th Axial Core

31st Axial Core

33rd Axial Core

34th Axial Core

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insertion, the impact Gd2O3 has on the neutron population has already been dramatically

reduced. As described above, this results in the re-insertion of control rods in a core that

possesses largely depleted burnable poisons. Thus, while control rod insertion at the top of the

core suppresses the neutron flux locally, the bottom of the core is now non-poisoned, and

contains no control rods, which dramatically increases the neutron flux, and the resultant

peaking factors.

To avoid this, the depletion of Gd2O3 must be slower than the natural depletion of U235

in the core, in order to avoid any re-insertion of control rods and the accompanying increase in

peaking factors. Unfortunately, the burnable poisons used in this section of fuel assemblies

contained the longest-lasting burnable poisons of all the fuel assemblies created in Chapter 4.

The lack of any longer-lasting poisons in any fuel assemblies leaves little options for

improvement.

Furthermore, the axial offset profile demonstrated in cores 30-32 show little to no

improvement from past iterations. Specifically, the MOC has consistently demonstrated a

strongly negative axial offset in every core. The ability to control this negative axial offset in

the MOC is linked to strong poisons at the bottom of the core that last throughout the MOC,

but cores in this fifth group (specifically cores 30-32) used fuel assemblies with the slowest

Gd2O3 depletion, and still demonstrated no significant improvement.

Since cores 30-32 did not provide enough poisons in the bottom of the core, cores 33

and 34 loaded even more poisons in the bottom, introducing fuel assemblies from the

unrealistic group detailed in Section 4.3.1.2.2. This was a last resort effort to provide enough

poisoning throughout the MOC. Unfortunately, the need to create a consistent Gd2O3 depletion

profile that matches U235 depletion in the core (to avoid further control rod re-insertion),

required these assemblies to contain more than necessary poisoning at BOC. As the results

from cores 33 and 34 demonstrated, this abundance of burnable poisons at BOC completely

overwhelmed the bottom of the core and suffocated any power production. This resulted in a

dramatically shortened core lifetime.

It appears that a strategy of axially grading the burnable poisons and U235 enrichment

percentages in order to combat the inevitable partial insertion of control rods will not create a

core that meets the design requirements listed in Chapter 3. To properly run a core without

soluble boron, alternate strategies must be explored.

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5.6 Conclusion

The above section detailed a search for a soluble boron-free core that met the design

requirements listed in Section 3.2. These requirements consisted primarily of a controlled

axial offset within +/- 0.4 and maximum peaking factors throughout burnup that were kept

below 4.22, and resulted in a maximum heat flux that maintained DNBR limits. While the

search held potential with some cores that contained potentially viable peaking factors, no

core even came close to an axial offset profile within +/- 0.4.

The limitations behind controlling the axial offset lie in the ability to provide consistent,

long term poisoning in the bottom of the core that both naturally matched the U235 depletion in

the core, and contained enough negative reactivity to offset the partial insertion of control

rods. Unfortunately, such a scheme proved untenable due to a lack of long-term poisoning.

Since Gd2O3 naturally depletes, the ability to provide sufficient negative reactivity from

burnable poisons throughout the MOC would result in fuel assemblies that are loaded with an

excess of burnable poisons at BOC. Any reduction in the initial amount of burnable poisons

creates a lack of negative reactivity during MOC, adversely affecting the axial offset profile.

Any attempt to provide a viable soluble boron-free SMR that meets the design

requirement would have to incorporate alternate strategies. A strategy based solely on axially

grading both the burnable poison content and the U235 enrichment percentages has thus far

proven untenable.

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Chapter 6 – Further Strategies for Soluble Boron-Free Operation

The above difficulties in controlling the axial power profile in a soluble boron-free core

demonstrate the inherent weaknesses of a strategy that only employs axially grading burnable

poisons and U235 enrichment percentages. In order to find a core that meets design

requirements, other strategies must be explored, but before any exploration into a new

strategy, a summary of the strategies employed in Chapter 5 is given below:

• One large control rod bank consisting of 20 fuel assemblies with control rods that are

actively inserted to maintain criticality.

• Large concentrations of burnable poisons in the bottom half of the core to

counterbalance the partial insertion of control rods.

• Axially graded U235 enrichment throughout the core for long-term axial power profile

control and other considerations.

It is important to note how the requirements placed on the burnable poisons arise from

the total reactivity worth in the partially inserted control rods. Since there are 20 fuel

assemblies with active control rods in the critical control rod bank (the rod bank that actively

maintains criticality), the total control rod worth inherent in this bank is relatively large.

This large amount of reactivity is what places a heavy burden on burnable poisons in

the bottom half of the core to balance out the axial reactivity compensation profile. However,

if the reactivity worth associated with the critical control rod bank is reduced, then the impact

this bank has on the axial power profile would be reduced as well. Simply put, reducing the

number of control rods that are partially inserted in the core minimizes their adverse impact on

the axial power profile.

In this vein, a simple and potentially more effective strategy for soluble boron-free

operation in an SMR would be to limit the total number of control rods that are actively

inserted in the core. While the amount of excess reactivity that must be compensated will not

change, the manner in which this reactivity is compensated will change. For example, reduce

the number of fuel assemblies in the critical rod bank from 20 to 9.

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To make up the loss in reactivity at BOC, separate control rod banks would have to be

completely inserted in the core. The completely inserted control rods provide axially uniform

reactivity compensation, and thus will not have an adverse impact on the axial power offset.

In the above example, only 9 fuel assemblies are in the critical rod bank. This lower

worth will result in quicker control rod withdrawal as U235 in the core naturally depletes.

Eventually, control rods in the critical rod bank will be fully withdrawn, at which point a set

number of fully inserted control rods from a separate control rod bank will be completely

withdrawn, prompting the critical rod bank to be re-inserted into the core. This process

continues until there are no more fully inserted control rods, at which point the core has

reached the end of its cycle.

6.1 Feasibility of the Advanced Control Rod Algorithm

The above control rod algorithm was demonstrated on the prototypical SMR core. To

demonstrate feasibility, this SMR core contained no axially graded burnable poisons or U235

enrichment, unlike Chapter 5. Every fuel assembly contained no burnable poisons, and was

loaded with 4.95% U235, producing the most excess reactivity possible for this SMR. The only

exception is the outer ring of fuel assemblies, which were loaded with 2.50% U235.

The feasibility of this control rod algorithm was tested with 9 fuel assemblies in the

critical rod bank at BOC. The large amount of excess reactivity at BOC arising from the lack

of burnable poisons and 4.95% U235 enriched fuel assemblies necessitates an extra 28 fuel

assemblies with completely inserted fuel rods.

This arrangement provided sufficient excess reactivity until 8.0 MWd/Kg, at which

point the natural depletion of U235 has prompted the critical rod bank to be fully withdrawn. At

this point, 8 fuel assemblies from a different control rod bank that were previously fully

inserted are now removed, leaving a total of 20 fuel assemblies fully inserted in the core. This

withdrawal of control rods prompts the critical rod group to be re-inserted, and the process

continues. Figure 93 displays all 5 depletion stages for this control rod algorithm.

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Figure 93: Depletion stages for an initial control rod algorithm designed to contain the axial

power profile.

In addition to simply removing fully inserted control rods from one depletion step to the

next, the geometrical arrangement of the fully inserted control rods was shuffled. This

provided a counterbalance to shielding and shadowing effects, resulting in a more uniform

exposure radially across the core.

The critical control rod bank was also changed, in both location and number of control

rods. The first two depletion steps contained 9 fuel assemblies, spanning from 0.0 MWd/Kg to

12.0 MWd/Kg. The next two depletion steps utilized a different rod bank for criticality search,

containing 8 fuel assemblies and spanning from 12.0 MWd/Kg to 23.0 MWd/Kg. The last and

final depletion stage contained just 4 fuel assemblies with no fully inserted rods, and ran until

EOC at 26.5 MWd/Kg.

Figure 94 below shows the axial power profile and control rod insertion vs burnup. In

stark contrast to the heavily poisoned cores in Chapter 5, the axial power offset contains

several sharp drops with each drop coinciding perfectly with the depletion stages outlined in

Figure 93.

100% Inserted CRD

100% Withdrawn CRD

Active CRD

0 - 8.0 MWd/Kg 8.0 - 12.0 MWd/Kg 12.0 - 17.0 MWd/Kg

17.0 - 23.0 MWd/Kg 23.0 - 26.5 MWd/Kg

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Figure 94: Axial offset and control rod insertion vs burnup for the initial control algorithm.

At BOC, the control rods in the critical rod bank are almost 100% inserted and slowly

withdrawal until 8 MWd/Kg where the next depletion stage begins. Throughout this first

depletion stage, the axial offset slowly climbs as the control rods are further withdrawn. As the

next depletion step begins at 8 MWd/Kg, the critical rod bank is re-inserted, prompting a sharp

dive in the axial offset before slowly rising again, with the process continuing throughout the

cycle.

Even without any burnable poisons or varied U235 enrichment loading, the axial offset

for this simple feasibility study the axial power offset was maintained within ± 0.5, an already

significant improvement from any core in Chapter 5. This demonstrates the feasibility of this

advanced control rod algorithm in maintaining the axial power offset.

Figure 95 displays the maximum peaking factor vs burnup. Aside from the first few

MWd/Kg of burnup, the peaking factors remain in roughly the same ballpark as a core with

soluble boron. The link between axial offset and maximum peaking factors is apparent, since

the sharp jumps and drops in axial offset once again coincide with the changing depletion

stages outlined in Figure 93. Refinements to the control rod algorithm and introducing some

nominal poisoning could further improve the both the peaking factors and the axial power

profile throughout burnup.

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

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-0.8

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-0.2

0

0.2

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0 5 10 15 20 25 30

Cont

rol R

od In

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Perc

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ge

Axia

l Pow

er O

ffset

Burnup (MWd/Kg)

Axial Offset

Control Rod Insertion

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Figure 95: Maximum total peaking factor vs burnup for the initial control rod algorithm.

6.2 Final Advanced Control Rod Algorithm

Section 6.1 outlined the feasibility behind using a control rod algorithm with various

depletion stages to control the axial offset in a soluble boron-free core. In order to find a core

that meets design requirements listed in Chapter 3, further refinements to the control rod

algorithm were performed.

Since the total number of partially inserted control rods is the primary factor behind

poor axial power offset performance, the number of fuel assemblies in the critical rod bank

was reduced from 8 to 5. In this manner, a minimum number of control rods are actively

inserted in the core. As a consequence, the lower worth associated with this critical rod bank

introduces more depletion stages, since this critical rod bank will respond to natural U235

depletion quicker than a rod bank with more worth.

Additionally, every fuel assembly was nominally poisoned with a fuel assembly from

the “Flat Burn” group of assemblies outlined in Section 4.3.1.1. That fuel assembly is listed in

Figure 96. The chosen fuel assembly was selected for its flat burnup characteristics, since it

should provide relatively constant excess reactivity compensation until 25 MWd/Kg, near the

end of the expected fuel cycle.

1

1.5

2

2.5

3

3.5

4

4.5

5

5.5

0 5 10 15 20 25 30

Max

imum

Pea

king

Fac

tor

Burnup (MWd/Kg)

Control Rod Algorithm Core

Soluble Boron Core

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Figure 96: kinf vs burnup for the fuel assembly used in the final control rod algorithm.

The fuel assembly U235 enrichment loading scheme and burnable poison profile is

outlined in Figure 97. Since there is no axial grading, the given profile is constant axially

throughout the core.

Figure 97: Fuel assembly U235 enrichment and burnable poison loading profile for the final advanced control rod algorithm.

Careful selection of the proper depletion steps for this arrangement was performed, and

is detailed in Figure 98. The introduction of uniform poisoning has reduced the reactivity

compensation burden on control rods at BOC from 28 fuel assemblies with fully inserted

control rods to 13. This drastic reduction, along with the already reduced amount of fuel

assemblies in the critical rod bank, impacts the axial offset and relative peaking factors

significantly.

1

1.05

1.1

1.15

1.2

1.25

1.3

0 5 10 15 20 25 30 35

K inf

Burnup (MWd/Kg)

Kinf vs Burnup

2.50 2.50 2.502.50 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 2.50

2.50 2.50 2.50

Fuel Assembly U235 Enrichment0 0 0

0 9.603 9.603 9.603 00 9.603 9.603 9.603 9.603 9.603 0

0 9.603 9.603 9.603 9.603 9.603 9.603 9.603 00 9.603 9.603 9.603 9.603 9.603 9.603 9.603 00 9.603 9.603 9.603 9.603 9.603 9.603 9.603 0

0 9.603 9.603 9.603 9.603 9.603 00 9.603 9.603 9.603 0

0 0 0

Average Burnable Poison Loading (grams)

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Figure 98: Depletion stages for the final advanced control rod algorithm.

As mentioned above, reducing the amount of fuel assemblies in the critical rod bank

reduces the total reactivity worth in that bank. This would ordinarily result in control rods that

would be withdrawn quicker, but the inclusion of poisoned fuel assemblies dampens this

effect. In this manner, the first two depletion stages last until 17.5 MWd/Kg. The final four

depletion stages are relatively shorter since by this point the burnable poisons are close to

being completely depleted and have lost their effectiveness.

As a general rule, the fully inserted fuel assemblies were kept close to the center of the

core to provide reactivity compensation where the neutron flux is naturally largest. Not only

does this limit the potential peaking factors, but it also increases the effectiveness of the

control rods since they are placed in high flux environments. The critical rod bank at the last

stages of the core cycle (from 23.5 – 30.0 MWd/Kg) were placed closer to the center of the

core since at this point there are very few to no other fuel assemblies with fully inserted

control rods. Placing the critical rod bank in the center increases their effectiveness.

Figure 99 shows the axial offset and control rod insertion percentage vs burnup. The

first two stages of burnup that cover the first 17.5 MWd/Kg of burnup provide a balanced and

controlled axial offset profile. Limiting the critical rod bank to just 4 fuel assemblies has

100% Inserted 100% Withdrawn CRD Active CRDs

0 - 6.5 MWd/Kg 6.5 - 17.5 MWd/Kg 17.5 - 22.0 MWd/Kg

22.0 - 23.5 MWd/Kg 23.5 - 28.0 MWd/Kg 28.0 - 30.0 MWd/Kg

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reduced their negative impact on the axial power offset. While the axial offset is still slightly

skewed toward negative values, it is contained within a band of ±0.4 throughout lifetime.

The core requires four more depletion steps after 17.5 MWd/Kg, largely due

increasingly ineffective burnable poisons that are nearing complete depletion. Nevertheless,

careful management of the depletion steps has still maintained the axial offset within a ±0.4

band.

Figure 99: Axial offset and control rod insertion percentage vs burnup for the final control rod algorithm.

Once again we can also see how the control rod movement mirrors the behavior of the

axial offset. Peaks and spikes in the axial offset coincide perfectly with the relative insertion

percentage of the critical rod band, demonstrating once again the link between the two.

Figure 100 shows the maximum peaking factor vs burnup for this specific control rod

algorithm. Here we can see how finally managing the axial offset has produced significantly

lower peaking factors at BOC, even outperforming an identical SMR core that employs

soluble boron instead of the above control rod algorithm. It is not until 22 MWd/Kg that the

soluble boron-free core with this control rod algorithm begins to experience higher peaking

factors. Once again, at this point the burnable poisons have largely depleted and are

increasingly ineffective, which gives rise to the potential for higher peaking factors due to this

loss of reactivity suppression.

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

-1

-0.8

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0 5 10 15 20 25 30

Cont

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Burnup (MWd/Kg)

Boron Free Core with Advanced CRD Algorithm

Boron Free Core with CRD Algorithm

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Figure 100: Maximum pin peaking factor vs burnup for the final control rod algorithm.

Nevertheless, the peaking factors are maintained within an acceptable range of a soluble

boron core for the entire core cycle according to the general limits provided in Section 3.2.2.

Couple this with the axial offset that is maintained under ±0.4, and the design requirements

listed in Chapter 3 are close to being completely met.

The last element is an exact calculation of the MDNBR, which would provide a

quantifiable measure of the ability to control power peaks through this control rod algorithm.

With that in mind, the maximum peaking factor occurs at the very end of the core’s lifetime,

where a pin the central fuel assembly contained a peaking factor of 3.99.

At this depletion stage, the specific peak pin produced 1769.6 KW/m2 in the 20th axial

node. Using the guidelines described in Section 3.2.2, this correlates to a MDNBR of:

𝑀𝐷𝑁𝐵𝑅 =2762 𝐾𝑊/𝑚2

𝑞′′=

2762 𝐾𝑊/𝑚2

1769.9 𝐾𝑊/𝑚2 = 1.56

Since 1.56 > 1.4, the specific MDNBR limits are preserved at this specific state point.

However, a thorough examination of every heat flux value at all depletion steps confirms that

1769.6 KW/m2 is the global maximum. This satisfies MDNBR requirements.

1

2

3

4

5

6

7

0 5 10 15 20 25 30

Max

imum

Pin

Pea

king

Fac

tor

Burnup (MWd/Kg)

Boron Free Core with Advanced CRD Algorithm

Soluble Boron Core

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Chapter 7 – Conclusions

The efforts outlined in Chapter 5 and Chapter 6 describes two different strategies for

running without soluble boron in a prototypical SMR. Removing soluble boron placed

increased dependence on control rods and burnable poisons for reactivity compensation, and

the differences in how both control rods and burnable poisons were utilized in the core

produced distinctly different operational profiles.

The strategies outlined in Chapter 5 describe the use of burnable poisons to manage the

axial power profile throughout burnup. The difficulties in managing the axial power profile

arise from the large amount of reactivity associated with the critical rod bank, and its

subsequent partial insertion in the core. Since control rods are inserted form the top down,

large concentrations of poisons were placed in the bottom of the core to provide a more

uniform reactivity compensation profile axially throughout the core.

This strategy led to difficulties due to the transient nature of the reactor core. As U235

naturally depletes, the required amount of reactivity compensation is also reduced, prompting

active control rod movement. Coupling this with the natural depletion of burnable poisons,

and the overall reactivity profile throughout the core was unsteady. Thus, while the control

rods and burnable poisons could be engineered to produce a proper axial power profile at

BOC, the results did not last for long. The depleting burnable poisons and continuous control

rod movement consistently resulted in an axial power profile that was significantly skewed

toward the bottom half of the core by MOC, before steadily rising to be significantly skewed

toward the top half of the core by EOC.

Despite several different strategies to contain the axial power profile at MOC and EOC,

the steady depletion of burnable poisons led to an inability to provide sufficient reactivity

compensation by MOC. The poisons had simply depleted too much by MOC, and any efforts

to increase the overall poisoning by MOC inevitably meant increased poisoning at BOC which

resulted in adverse and unacceptable effects on core performance at BOC.

This inherent problem led to a search for alternate strategies for operating a SMR

without soluble boron. The first strategy suffered from a large amount of reactivity inherent to

the critical rod bank, prompting the use of strong burnable poisons to offset partial insertion of

this bank. To avoid the complications that arose from the first strategy the amount of reactivity

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in the critical rod bank was significantly reduced. In this manner, the critical rod bank’s effect

on the axial power profile arising from partial insertion was also reduced.

Chapter 6 outlined the complications and results from a strategy based on reducing the

reactivity associated with the critical rod bank. The study found that, if done properly, the

axial offset and resultant maximum peaking factors could meet design requirements outlined

in Chapter 3. The first strategy (Chapter 5) resulted in peaking factors that were acceptable,

but an axial power profile that was unacceptable. Thus, the method described in Chapter 6

delivers the most promise for effectively operating a prototypical SMR without soluble boron.

To demonstrate these results, Figures 101 and 102 compare the axial power offset and

the maximum peaking factor vs burnup for the best results from the first and second strategies

(Chapter 5 and Chapter 6, respectively), and with a traditional SMR that operates with soluble

boron.

Figure 101: Axial offset vs burnup for the boron-free core with axially graded burnable poisons, the boron-free core with the final control rod algorithm, and for a soluble boron core.

-1

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1

0 5 10 15 20 25 30

Axia

l Pow

er O

ffset

Burnup (MWd/Kg)

Boron Free Core with Axially Graded Burnable Poisons

Boron Free Core with Advanced CRD Algorithm

Soluble Boron Core

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Figure 102: Maximum pin peaking factor vs burnup for the boron-free core with axially graded burnable poisons, the boron-free core with the final control rod algorithm, and for a soluble boron core.

Reducing the reactivity worth associated with the critical rod bank produced the best

results with respect to the axial power profile and the maximum peaking factors. It is

important to note that this study did not attempt to provide an ideal core, it only attempted to

demonstrate the feasibility of soluble boron-free operation in a prototypical SMR. The

research identified the most important factors in operation (axial power profile and maximum

peaking factors), and provided results with respect to these factors. In this respect, further

improvements can be realized through a comprehensive study based on the strategy entailed in

Chapter 6.

Further insight into the differences in the physical characteristics between a core with

and without soluble boron provided further evidence toward the increased safety inherent in

soluble boron-free designs. Most of these safety factors arise from neutronic characteristics

due to the lack of a strong thermal absorber (boron). Further density effects in the moderator

and an increase in plutonium production provide improved reactivity coefficients, bolstering

1

1.5

2

2.5

3

3.5

4

0 5 10 15 20 25 30

Max

imum

Pin

Pea

king

Fac

tor

Burnup (MWD/KG)

Boron Free Core with Axially Graded Burnable Poisons

Boron Free Core with Advanced CRD Algorithm

Soluble Boron Core

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the inherent natural stability of the reactor. These effects combine to make a boron-free SMR

an attractive possibility for utilities seeking installation in previously unreached markets.

7.1 Future Work

7.1.1 Further Control Rod Algorithms and Axial Loading Strategies

This study on soluble boron-free operation was never meant to be an optimization

study. While several distinct advantages and strategies related to boron free operation have

been identified, much work remains to be done. The current landscape of SMRs identifies a

few current boron-free designs. While specifics regarding their operational strategy remain

proprietary, further work can be done to develop the advanced control rod algorithm into a

proven design strategy for soluble boron-free operation.

To accomplish this, it should be noted that this study primarily sheds light on the

immense difficulty of controlling the axial power profile throughout burnup for a soluble

boron-free core. The two main strategies used to control the axial power profile are explored

independent of each other. However, some combination of the two could result in a further

improved axial power profile and reduced pin peaking factors.

Due to the better performance of the control rod algorithm approach, this combination

would be expected to employ a further refined control rod algorithm as a foundational

strategy. Employing additional axially graded burnable poisons or U235 enrichment loading

profiles could bring increased performance and further extended lifetimes.

7.1.2 Gadolinia-Oxide Burnable Poison Pellets

The shortcomings behind axially graded burnable poisons arose primarily due to an

inability to provide sufficient reactivity suppression throughout MOC. Since the current scope

of burnable poisons have steady depletion effects, any poisoning scheme that attempts to

provide sufficient MOC suppression would inevitably result in over-poisoning at BOC.

One potential strategy to provide sufficient poisoning at MOC includes making use of

strong self-shielding characteristics inherent to pellets of Gd2O3 that are discretely placed

within fuel pins (not homogeneously mixed) [22]. In this manner, the pellets would act as

strong neutron absorbers with very strong shielding effects.

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157

Essentially, the small pellet size could reduce the poisoning impact at BOC while the

shielding effects could extend the effective poisoning lifetime well into EOC. While designing

and modeling such a scenario would be challenging, the impact on soluble boron-free

operation could bring enhanced performance.

7.1.3 Partial Elimination of Soluble Boron

The benefits inherent to total elimination of soluble boron include simplification of

plant operation, elimination of corrosive effects, reduction of radioactive waste volumes and

the associated CVCS functions, and elimination of potential boron-dilution accidents.

However, all of these benefits would also be realized in the partial elimination of soluble

boron.

In partial elimination, a reduced amount of soluble boron is kept in the coolant. There

is no variation to the amount of boron so there would be no need for active CVCS functions,

bringing additional plant simplification. The reduction of boron would bring both reduced

corrosive effects and mitigated dilution accidents.

To some extent, partial elimination is a middle ground between active soluble boron

dilution and complete elimination. The effects are still felt, but they are minimized to some

extent. Furthermore, the burden on control rods and burnable poisons are still increased,

bringing with it complications in controlling the axial power profile throughout burnup.

However, perhaps the greatest application of partial elimination comes from current SMR

designs that employ multiple reactors in a single building. In such scenarios, a single control

room is tasked with controlling and operating multiple units. If each of these reactors actively

employs soluble boron then a single team of reactor operators managing multiple units with

different concentrations of soluble boron would create a strong potential for confusion.

With a constant level of soluble boron in the core, not only are the benefits of reduced

boron realized, but it also avoids complications involved with such postulated accident

scenarios.

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158

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Appendix

The following appendix details axial loading geometry for each core listed in Chapter

5. Both the average burnable poison loading (in grams) and the U235 enrichment loading in

each assembly and for each 25 axial nodes are given.

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Figure 103: Average burnable poison loading (grams) per node for the 1st core

0 0 0 0 0 0 0 0 00 9.603 9.603 9.603 0 0 9.603 9.603 9.603 0 0 11.32 11.32 11.32 0

0 11.32 9.603 9.603 9.603 11.32 0 0 11.32 11.32 11.32 11.32 11.32 0 0 11.32 11.32 11.32 11.32 11.32 00 9.603 9.603 7.545 14.4 7.545 9.603 9.603 0 0 9.603 11.32 7.545 14.4 7.545 11.32 9.603 0 0 11.32 11.32 7.545 14.4 7.545 11.32 11.32 00 9.603 9.603 14.4 7.545 14.4 9.603 9.603 0 0 9.603 11.32 14.4 7.545 14.4 11.32 9.603 0 0 11.32 11.32 14.4 9.603 14.4 11.32 11.32 00 9.603 9.603 7.545 14.4 7.545 9.603 9.603 0 0 9.603 11.32 7.545 14.4 7.545 11.32 9.603 0 0 11.32 11.32 7.545 14.4 7.545 11.32 11.32 0

0 11.32 9.603 9.603 9.603 11.32 0 0 11.32 11.32 11.32 11.32 11.32 0 0 11.32 11.32 11.32 11.32 11.32 00 9.603 9.603 9.603 0 0 9.603 9.603 9.603 0 0 11.32 11.32 11.32 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 11.32 11.32 11.32 0 0 11.32 11.32 11.32 0 0 11.32 11.32 11.32 0

0 11.32 11.32 11.32 11.32 11.32 0 0 11.32 11.32 11.32 11.32 11.32 0 0 11.32 11.32 11.32 11.32 11.32 00 11.32 11.32 7.545 14.4 7.545 11.32 11.32 0 0 11.32 11.32 11.32 14.4 11.32 11.32 11.32 0 0 11.32 11.32 7.545 14.4 7.545 11.32 11.32 00 11.32 11.32 14.4 9.603 14.4 11.32 11.32 0 0 11.32 11.32 14.4 9.603 14.4 11.32 11.32 0 0 11.32 11.32 14.4 9.603 14.4 11.32 11.32 00 11.32 11.32 7.545 14.4 7.545 11.32 11.32 0 0 11.32 11.32 11.32 14.4 11.32 11.32 11.32 0 0 11.32 11.32 7.545 14.4 7.545 11.32 11.32 0

0 11.32 11.32 11.32 11.32 11.32 0 0 11.32 11.32 11.32 11.32 11.32 0 0 11.32 11.32 11.32 11.32 11.32 00 11.32 11.32 11.32 0 0 11.32 11.32 11.32 0 0 11.32 11.32 11.32 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 11.32 11.32 11.32 0 0 9.603 9.603 9.603 0 0 9.603 9.603 9.603 0

0 11.32 11.32 11.32 11.32 11.32 0 0 11.32 9.603 9.603 9.603 11.32 0 0 11.32 9.603 9.603 9.603 11.32 00 11.32 11.32 7.545 14.4 7.545 11.32 11.32 0 0 9.603 9.603 7.545 11.32 7.545 9.603 9.603 0 0 9.603 9.603 7.545 11.32 7.545 9.603 9.603 00 11.32 11.32 14.4 9.603 14.4 11.32 11.32 0 0 9.603 9.603 11.32 7.545 11.32 9.603 9.603 0 0 9.603 9.603 11.32 7.545 11.32 9.603 9.603 00 11.32 11.32 7.545 14.4 7.545 11.32 11.32 0 0 9.603 9.603 7.545 11.32 7.545 9.603 9.603 0 0 9.603 9.603 7.545 11.32 7.545 9.603 9.603 0

0 11.32 11.32 11.32 11.32 11.32 0 0 11.32 9.603 9.603 9.603 11.32 0 0 11.32 9.603 9.603 9.603 11.32 00 11.32 11.32 11.32 0 0 9.603 9.603 9.603 0 0 9.603 9.603 9.603 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 9.603 9.603 9.603 0 0 4.801 4.801 4.801 0 0 0 0 0 0

0 11.32 4.801 4.801 4.801 11.32 0 0 7.545 4.801 4.801 4.801 7.545 0 0 9.603 0 0 0 9.603 00 9.603 4.801 9.603 11.32 9.603 4.801 9.603 0 0 4.801 4.801 9.603 11.32 9.603 4.801 4.801 0 0 0 0 9.603 11.32 9.603 0 0 00 9.603 4.801 11.32 4.801 11.32 4.801 9.603 0 0 4.801 4.801 11.32 4.801 11.32 4.801 4.801 0 0 0 0 11.32 4.801 11.32 0 0 00 9.603 4.801 9.603 11.32 9.603 4.801 9.603 0 0 4.801 4.801 9.603 11.32 9.603 4.801 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0

0 11.32 4.801 4.801 4.801 11.32 0 0 7.545 4.801 4.801 4.801 7.545 0 0 9.603 0 0 0 9.603 00 9.603 9.603 9.603 0 0 4.801 4.801 4.801 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 0 0 11.32 4.801 11.32 0 0 0 0 0 0 11.32 4.801 11.32 0 0 0 0 0 0 11.32 4.801 11.32 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 0 0 11.32 4.801 11.32 0 0 0 0 0 0 11.32 4.801 11.32 0 0 0 0 0 0 11.32 4.801 11.32 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 0 0 11.32 4.801 11.32 0 0 0 0 0 0 11.32 4.801 11.32 0 0 0 0 0 0 11.32 4.801 11.32 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 0 0 11.32 4.801 11.32 0 0 0 0 0 0 11.32 4.801 11.32 0 0 0 0 0 0 11.32 4.801 11.32 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 1st Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

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169

Figure 104: Fuel assembly U235 enrichment per node for the 1st core.

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.502.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.502.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 4.00 4.00 4.00 4.00 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 4.00 3.50 3.50 3.50 3.50 3.50 4.00 2.50 2.50 4.50 4.00 3.50 3.50 3.50 4.00 4.50 2.502.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 4.00 3.50 3.00 3.50 4.00 4.00 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 4.00 3.50 3.50 3.50 3.50 3.50 4.00 2.50 2.50 4.50 4.00 3.50 3.50 3.50 4.00 4.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 4.00 4.00 4.00 4.00 2.502.50 3.50 3.50 3.50 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.00 3.50 4.00 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.00 4.00 3.00 3.50 4.50 2.50 2.50 4.00 3.50 3.00 4.00 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 3.50 3.50 4.00 3.00 4.00 3.50 3.50 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.50 3.50 3.00 4.00 3.00 3.50 4.50 2.50 2.50 4.00 3.50 3.00 4.00 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.00 3.50 4.00 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 1st Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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Figure 105: Average burnable poison loading (grams) per node for the 2nd core.

0 0 0 0 0 0 0 0 00 9.603 9.603 9.603 0 0 9.603 9.603 9.603 0 0 11.32 11.32 11.32 0

0 11.32 9.603 9.603 9.603 11.32 0 0 11.32 11.32 11.32 11.32 11.32 0 0 11.32 11.32 11.32 11.32 11.32 00 9.603 9.603 7.545 14.4 7.545 9.603 9.603 0 0 9.603 11.32 7.545 14.4 7.545 11.32 9.603 0 0 11.32 11.32 7.545 14.4 7.545 11.32 11.32 00 9.603 9.603 14.4 7.545 14.4 9.603 9.603 0 0 9.603 11.32 14.4 7.545 14.4 11.32 9.603 0 0 11.32 11.32 14.4 9.603 14.4 11.32 11.32 00 9.603 9.603 7.545 14.4 7.545 9.603 9.603 0 0 9.603 11.32 7.545 14.4 7.545 11.32 9.603 0 0 11.32 11.32 7.545 14.4 7.545 11.32 11.32 0

0 11.32 9.603 9.603 9.603 11.32 0 0 11.32 11.32 11.32 11.32 11.32 0 0 11.32 11.32 11.32 11.32 11.32 00 9.603 9.603 9.603 0 0 9.603 9.603 9.603 0 0 11.32 11.32 11.32 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 11.32 11.32 11.32 0 0 11.32 11.32 11.32 0 0 11.32 11.32 11.32 0

0 11.32 11.32 11.32 11.32 11.32 0 0 11.32 11.32 11.32 11.32 11.32 0 0 11.32 11.32 11.32 11.32 11.32 00 11.32 11.32 7.545 14.4 7.545 11.32 11.32 0 0 11.32 11.32 11.32 14.4 11.32 11.32 11.32 0 0 11.32 11.32 7.545 14.4 7.545 11.32 11.32 00 11.32 11.32 14.4 9.603 14.4 11.32 11.32 0 0 11.32 11.32 14.4 9.603 14.4 11.32 11.32 0 0 11.32 11.32 14.4 9.603 14.4 11.32 11.32 00 11.32 11.32 7.545 14.4 7.545 11.32 11.32 0 0 11.32 11.32 11.32 14.4 11.32 11.32 11.32 0 0 11.32 11.32 7.545 14.4 7.545 11.32 11.32 0

0 11.32 11.32 11.32 11.32 11.32 0 0 11.32 11.32 11.32 11.32 11.32 0 0 11.32 11.32 11.32 11.32 11.32 00 11.32 11.32 11.32 0 0 11.32 11.32 11.32 0 0 11.32 11.32 11.32 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 11.32 11.32 11.32 0 0 9.603 9.603 9.603 0 0 9.603 9.603 9.603 0

0 11.32 11.32 11.32 11.32 11.32 0 0 11.32 9.603 9.603 9.603 11.32 0 0 11.32 9.603 9.603 9.603 11.32 00 11.32 11.32 7.545 14.4 7.545 11.32 11.32 0 0 9.603 9.603 7.545 11.32 7.545 9.603 9.603 0 0 9.603 9.603 7.545 11.32 7.545 9.603 9.603 00 11.32 11.32 14.4 9.603 14.4 11.32 11.32 0 0 9.603 9.603 11.32 7.545 11.32 9.603 9.603 0 0 9.603 9.603 11.32 7.545 11.32 9.603 9.603 00 11.32 11.32 7.545 14.4 7.545 11.32 11.32 0 0 9.603 9.603 7.545 11.32 7.545 9.603 9.603 0 0 9.603 9.603 7.545 11.32 7.545 9.603 9.603 0

0 11.32 11.32 11.32 11.32 11.32 0 0 11.32 9.603 9.603 9.603 11.32 0 0 11.32 9.603 9.603 9.603 11.32 00 11.32 11.32 11.32 0 0 9.603 9.603 9.603 0 0 9.603 9.603 9.603 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 9.603 9.603 9.603 0 0 4.801 4.801 4.801 0 0 7.545 7.545 7.545 0

0 11.32 4.801 4.801 4.801 11.32 0 0 7.545 4.801 4.801 4.801 7.545 0 0 9.603 7.545 7.545 7.545 9.603 00 9.603 4.801 9.603 11.32 9.603 4.801 9.603 0 0 4.801 4.801 9.603 11.32 9.603 4.801 4.801 0 0 7.545 7.545 9.603 11.32 9.603 7.545 7.545 00 9.603 4.801 11.32 4.801 11.32 4.801 9.603 0 0 4.801 4.801 11.32 4.801 11.32 4.801 4.801 0 0 7.545 7.545 11.32 4.801 11.32 7.545 7.545 00 9.603 4.801 9.603 11.32 9.603 4.801 9.603 0 0 4.801 4.801 9.603 11.32 9.603 4.801 4.801 0 0 7.545 7.545 9.603 11.32 9.603 7.545 7.545 0

0 11.32 4.801 4.801 4.801 11.32 0 0 7.545 4.801 4.801 4.801 7.545 0 0 9.603 7.545 7.545 7.545 9.603 00 9.603 9.603 9.603 0 0 4.801 4.801 4.801 0 0 7.545 7.545 7.545 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 7.545 7.545 7.545 0 0 7.545 7.545 7.545 0 0 7.545 7.545 7.545 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 7.545 7.545 9.603 11.32 9.603 7.545 7.545 0 0 7.545 7.545 9.603 11.32 9.603 7.545 7.545 0 0 7.545 7.545 9.603 11.32 9.603 7.545 7.545 00 7.545 7.545 11.32 4.801 11.32 7.545 7.545 0 0 7.545 7.545 11.32 4.801 11.32 7.545 7.545 0 0 7.545 7.545 11.32 4.801 11.32 7.545 7.545 00 7.545 7.545 9.603 11.32 9.603 7.545 7.545 0 0 7.545 7.545 9.603 11.32 9.603 7.545 7.545 0 0 7.545 7.545 9.603 11.32 9.603 7.545 7.545 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 7.545 7.545 7.545 0 0 7.545 7.545 7.545 0 0 7.545 7.545 7.545 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 7.545 7.545 7.545 0 0 7.545 7.545 7.545 0 0 7.545 7.545 7.545 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 7.545 7.545 9.603 11.32 9.603 7.545 7.545 0 0 7.545 7.545 9.603 11.32 9.603 7.545 7.545 0 0 7.545 7.545 9.603 11.32 9.603 7.545 7.545 00 7.545 7.545 11.32 4.801 11.32 7.545 7.545 0 0 7.545 7.545 11.32 4.801 11.32 7.545 7.545 0 0 7.545 7.545 11.32 4.801 11.32 7.545 7.545 00 7.545 7.545 9.603 11.32 9.603 7.545 7.545 0 0 7.545 7.545 9.603 11.32 9.603 7.545 7.545 0 0 7.545 7.545 9.603 11.32 9.603 7.545 7.545 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 7.545 7.545 7.545 0 0 7.545 7.545 7.545 0 0 7.545 7.545 7.545 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 7.545 7.545 7.545 0 0 7.545 7.545 7.545 0 0 7.545 7.545 7.545 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 7.545 7.545 9.603 11.32 9.603 7.545 7.545 0 0 7.545 7.545 9.603 11.32 9.603 7.545 7.545 0 0 7.545 7.545 9.603 11.32 9.603 7.545 7.545 00 7.545 7.545 11.32 4.801 11.32 7.545 7.545 0 0 7.545 7.545 11.32 4.801 11.32 7.545 7.545 0 0 7.545 7.545 11.32 4.801 11.32 7.545 7.545 00 7.545 7.545 9.603 11.32 9.603 7.545 7.545 0 0 7.545 7.545 9.603 11.32 9.603 7.545 7.545 0 0 7.545 7.545 9.603 11.32 9.603 7.545 7.545 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 7.545 7.545 7.545 0 0 7.545 7.545 7.545 0 0 7.545 7.545 7.545 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 7.545 7.545 7.545 0 0 7.545 7.545 7.545 0 0 7.545 7.545 7.545 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 7.545 7.545 9.603 11.32 9.603 7.545 7.545 0 0 7.545 7.545 9.603 11.32 9.603 7.545 7.545 0 0 7.545 7.545 9.603 11.32 9.603 7.545 7.545 00 7.545 7.545 11.32 4.801 11.32 7.545 7.545 0 0 7.545 7.545 11.32 4.801 11.32 7.545 7.545 0 0 7.545 7.545 11.32 4.801 11.32 7.545 7.545 00 7.545 7.545 9.603 11.32 9.603 7.545 7.545 0 0 7.545 7.545 9.603 11.32 9.603 7.545 7.545 0 0 7.545 7.545 9.603 11.32 9.603 7.545 7.545 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 7.545 7.545 7.545 0 0 7.545 7.545 7.545 0 0 7.545 7.545 7.545 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 2nd Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

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171

Figure 106: Fuel assembly U235 enrichment per node for the 2nd core.

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.502.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.502.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 4.00 4.00 4.00 4.00 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 4.00 3.50 3.50 3.50 3.50 3.50 4.00 2.50 2.50 4.50 4.00 3.50 3.50 3.50 4.00 4.50 2.502.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 4.00 3.50 3.00 3.50 4.00 4.00 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 4.00 3.50 3.50 3.50 3.50 3.50 4.00 2.50 2.50 4.50 4.00 3.50 3.50 3.50 4.00 4.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 4.00 4.00 4.00 4.00 2.502.50 3.50 3.50 3.50 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.00 3.50 4.00 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.00 4.00 3.00 3.50 4.50 2.50 2.50 4.00 3.50 3.00 4.00 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 3.50 3.50 4.00 3.00 4.00 3.50 3.50 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.50 3.50 3.00 4.00 3.00 3.50 4.50 2.50 2.50 4.00 3.50 3.00 4.00 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.00 3.50 4.00 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 2nd Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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172

Figure 107: Average burnable poison loading (grams) per node for the 3rd core.

0 0 0 0 0 0 0 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 3rd Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

Page 191: SBF in SMRs - MartJustinR2013

173

Figure 108: Fuel assembly U235 enrichment per node for the 3rd core.

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 3rd Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Page 192: SBF in SMRs - MartJustinR2013

174

Figure 109: Average burnable poison loading (grams) per node for the 4th core

0 0 0 0 0 0 0 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 4th Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

Page 193: SBF in SMRs - MartJustinR2013

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Figure 110: Fuel assembly U235 enrichment per node for the 4th core.

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 4th Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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176

Figure 111: Average burnable poison loading (grams) per node for the 5th core.

0 0 0 0 0 0 0 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 5th Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

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177

Figure 112: Fuel assembly U235 enrichment per node for the 5th core.

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 5th Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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178

Figure 113: Average burnable poison loading (grams) per node for the 6th core.

0 0 0 0 0 0 0 0 00 11.32 9.603 11.32 0 0 11.32 9.603 11.32 0 0 11.32 9.603 11.32 0

0 11.32 11.32 7.545 11.32 11.32 0 0 11.32 11.32 7.545 11.32 11.32 0 0 11.32 11.32 7.545 11.32 11.32 00 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 11.32 11.32 7.545 7.545 7.545 11.32 11.32 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0

0 11.32 11.32 7.545 11.32 11.32 0 0 11.32 11.32 7.545 11.32 11.32 0 0 11.32 11.32 7.545 11.32 11.32 00 11.32 9.603 11.32 0 0 11.32 9.603 11.32 0 0 11.32 9.603 11.32 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 11.32 9.603 11.32 0 0 0 9.603 0 0 0 0 9.603 0 0

0 11.32 11.32 7.545 11.32 11.32 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 11.32 11.32 7.545 11.32 11.32 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 11.32 9.603 11.32 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 6th Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

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Figure 114: Fuel assembly U235 enrichment per node for the 6th core.

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 6th Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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Figure 115: Average burnable poison loading (grams) per node for the 7th core.

0 0 0 0 0 0 0 0 00 11.32 9.603 11.32 0 0 11.32 9.603 11.32 0 0 11.32 9.603 11.32 0

0 11.32 11.32 7.545 11.32 11.32 0 0 11.32 11.32 7.545 11.32 11.32 0 0 11.32 11.32 7.545 11.32 11.32 00 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 11.32 11.32 7.545 7.545 7.545 11.32 11.32 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0

0 11.32 11.32 7.545 11.32 11.32 0 0 11.32 11.32 7.545 11.32 11.32 0 0 11.32 11.32 7.545 11.32 11.32 00 11.32 9.603 11.32 0 0 11.32 9.603 11.32 0 0 11.32 9.603 11.32 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 11.32 9.603 11.32 0 0 0 9.603 0 0 0 0 9.603 0 0

0 11.32 11.32 7.545 11.32 11.32 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 11.32 11.32 7.545 11.32 11.32 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 11.32 9.603 11.32 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 7th Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

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181

Figure 116: Fuel assembly U235 enrichment per node for the 7th core.

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 7th Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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Figure 117: Average burnable poison loading (grams) per node for the 8th core.

0 0 0 0 0 0 0 0 00 11.32 9.603 11.32 0 0 11.32 9.603 11.32 0 0 11.32 9.603 11.32 0

0 11.32 11.32 7.545 11.32 11.32 0 0 11.32 11.32 7.545 11.32 11.32 0 0 11.32 11.32 7.545 11.32 11.32 00 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 11.32 11.32 7.545 7.545 7.545 11.32 11.32 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0

0 11.32 11.32 7.545 11.32 11.32 0 0 11.32 11.32 7.545 11.32 11.32 0 0 11.32 11.32 7.545 11.32 11.32 00 11.32 9.603 11.32 0 0 11.32 9.603 11.32 0 0 11.32 9.603 11.32 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 11.32 9.603 11.32 0 0 0 9.603 0 0 0 0 9.603 0 0

0 11.32 11.32 7.545 11.32 11.32 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 11.32 11.32 7.545 11.32 11.32 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 11.32 9.603 11.32 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 11.32 0 11.32 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 8th Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

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183

Figure 118: Fuel assembly U235 enrichment per node for the 8th core.

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.50 3.00 4.50 3.50 4.00 2.50 2.50 4.00 3.50 4.50 3.00 4.50 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 8th Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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184

Figure 119: Average burnable poison loading (grams) per node for the 9th core.

0 0 0 0 0 0 0 0 00 11.32 9.603 11.32 0 0 11.32 9.603 11.32 0 0 11.32 9.603 11.32 0

0 11.32 11.32 7.545 11.32 11.32 0 0 11.32 11.32 7.545 11.32 11.32 0 0 11.32 11.32 7.545 11.32 11.32 00 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 11.32 11.32 7.545 7.545 7.545 11.32 11.32 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0

0 11.32 11.32 7.545 11.32 11.32 0 0 11.32 11.32 7.545 11.32 11.32 0 0 11.32 11.32 7.545 11.32 11.32 00 11.32 9.603 11.32 0 0 11.32 9.603 11.32 0 0 11.32 9.603 11.32 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 11.32 9.603 11.32 0 0 0 9.603 0 0 0 0 9.603 0 0

0 11.32 11.32 7.545 11.32 11.32 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 11.32 11.32 7.545 11.32 11.32 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 11.32 9.603 11.32 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 9th Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

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185

Figure 120: Fuel assembly U235 enrichment per node for the 9th core.

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 3.50 3.50 3.50 2.50 2.50 3.00 3.00 3.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.502.50 4.00 4.00 4.00 2.50 2.50 3.50 3.50 3.50 2.50 2.50 3.00 3.00 3.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50

2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50

2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.502.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50

2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50

2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.502.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 9th Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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186

Figure 121: Average burnable poison loading (grams) per node for the 10th core.

0 0 0 0 0 0 0 0 00 22.63 14.75 22.63 0 0 22.63 14.75 22.63 0 0 22.63 14.75 22.63 0

0 22.63 22.63 11.66 22.63 22.63 0 0 22.63 22.63 11.66 22.63 22.63 0 0 22.63 22.63 11.66 22.63 22.63 00 22.63 22.63 11.66 11.66 11.66 22.63 22.63 0 0 22.63 22.63 11.66 11.66 11.66 22.63 22.63 0 0 22.63 22.63 11.66 11.66 11.66 22.63 22.63 00 14.75 11.66 11.66 22.63 11.66 11.66 14.75 0 0 14.75 11.66 11.66 22.63 11.66 11.66 14.75 0 0 14.75 11.66 11.66 22.63 11.66 11.66 14.75 00 22.63 22.63 11.66 11.66 11.66 22.63 22.63 0 0 22.63 22.63 11.66 11.66 11.66 22.63 22.63 0 0 22.63 22.63 11.66 11.66 11.66 22.63 22.63 0

0 22.63 22.63 11.66 22.63 22.63 0 0 22.63 22.63 11.66 22.63 22.63 0 0 22.63 22.63 11.66 22.63 22.63 00 22.63 14.75 22.63 0 0 22.63 14.75 22.63 0 0 22.63 14.75 22.63 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 22.63 14.75 22.63 0 0 5.487 14.75 5.487 0 0 5.487 14.75 5.487 0

0 22.63 22.63 11.66 22.63 22.63 0 0 5.487 8.574 11.66 8.574 5.487 0 0 5.487 8.574 11.66 8.574 5.487 00 22.63 22.63 11.66 11.66 11.66 22.63 22.63 0 0 5.487 8.574 11.66 11.66 11.66 8.574 5.487 0 0 5.487 8.574 11.66 11.66 11.66 8.574 5.487 00 14.75 11.66 11.66 22.63 11.66 11.66 14.75 0 0 14.75 11.66 11.66 22.63 11.66 11.66 14.75 0 0 14.75 11.66 11.66 22.63 11.66 11.66 14.75 00 22.63 22.63 11.66 11.66 11.66 22.63 22.63 0 0 5.487 8.574 11.66 11.66 11.66 8.574 5.487 0 0 5.487 8.574 11.66 11.66 11.66 8.574 5.487 0

0 22.63 22.63 11.66 22.63 22.63 0 0 5.487 8.574 11.66 8.574 5.487 0 0 5.487 8.574 11.66 8.574 5.487 00 22.63 14.75 22.63 0 0 5.487 14.75 5.487 0 0 5.487 14.75 5.487 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 5.487 14.75 5.487 0 0 5.487 14.75 5.487 0 0 5.487 14.75 5.487 0

0 5.487 8.574 11.66 8.574 5.487 0 0 5.487 8.574 11.66 8.574 5.487 0 0 5.487 8.574 11.66 8.574 5.487 00 5.487 8.574 11.66 11.66 11.66 8.574 5.487 0 0 5.487 8.574 11.66 11.66 11.66 8.574 5.487 0 0 5.487 8.574 11.66 11.66 11.66 8.574 5.487 00 14.75 11.66 11.66 22.63 11.66 11.66 14.75 0 0 14.75 11.66 11.66 22.63 11.66 11.66 14.75 0 0 14.75 11.66 11.66 22.63 11.66 11.66 14.75 00 5.487 8.574 11.66 11.66 11.66 8.574 5.487 0 0 5.487 8.574 11.66 11.66 11.66 8.574 5.487 0 0 5.487 8.574 11.66 11.66 11.66 8.574 5.487 0

0 5.487 8.574 11.66 8.574 5.487 0 0 5.487 8.574 11.66 8.574 5.487 0 0 5.487 8.574 11.66 8.574 5.487 00 5.487 14.75 5.487 0 0 5.487 14.75 5.487 0 0 5.487 14.75 5.487 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 10th Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

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187

Figure 122: Fuel assembly U235 enrichment per node for the 10th core.

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 3.50 3.50 3.50 2.50 2.50 3.00 3.00 3.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.502.50 4.00 4.00 4.00 2.50 2.50 3.50 3.50 3.50 2.50 2.50 3.00 3.00 3.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50

2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50

2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.502.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50

2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50

2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.502.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 10th Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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188

Figure 123: Average burnable poison loading (grams) per node for the 11th core.

0 0 0 0 0 0 0 0 00 22.63 14.75 22.63 0 0 22.63 14.75 22.63 0 0 22.63 14.75 22.63 0

0 22.63 22.63 11.66 22.63 22.63 0 0 22.63 22.63 11.66 22.63 22.63 0 0 22.63 22.63 11.66 22.63 22.63 00 22.63 22.63 11.66 11.66 11.66 22.63 22.63 0 0 22.63 22.63 11.66 11.66 11.66 22.63 22.63 0 0 22.63 22.63 11.66 11.66 11.66 22.63 22.63 00 14.75 11.66 11.66 22.63 11.66 11.66 14.75 0 0 14.75 11.66 11.66 22.63 11.66 11.66 14.75 0 0 14.75 11.66 11.66 22.63 11.66 11.66 14.75 00 22.63 22.63 11.66 11.66 11.66 22.63 22.63 0 0 22.63 22.63 11.66 11.66 11.66 22.63 22.63 0 0 22.63 22.63 11.66 11.66 11.66 22.63 22.63 0

0 22.63 22.63 11.66 22.63 22.63 0 0 22.63 22.63 11.66 22.63 22.63 0 0 22.63 22.63 11.66 22.63 22.63 00 22.63 14.75 22.63 0 0 22.63 14.75 22.63 0 0 22.63 14.75 22.63 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 22.63 14.75 22.63 0 0 5.487 14.75 5.487 0 0 5.487 14.75 5.487 0

0 22.63 22.63 11.66 22.63 22.63 0 0 5.487 8.574 11.66 8.574 5.487 0 0 5.487 8.574 11.66 8.574 5.487 00 22.63 22.63 11.66 11.66 11.66 22.63 22.63 0 0 5.487 8.574 11.66 11.66 11.66 8.574 5.487 0 0 5.487 8.574 11.66 11.66 11.66 8.574 5.487 00 14.75 11.66 11.66 22.63 11.66 11.66 14.75 0 0 14.75 11.66 11.66 22.63 11.66 11.66 14.75 0 0 14.75 11.66 11.66 22.63 11.66 11.66 14.75 00 22.63 22.63 11.66 11.66 11.66 22.63 22.63 0 0 5.487 8.574 11.66 11.66 11.66 8.574 5.487 0 0 5.487 8.574 11.66 11.66 11.66 8.574 5.487 0

0 22.63 22.63 11.66 22.63 22.63 0 0 5.487 8.574 11.66 8.574 5.487 0 0 5.487 8.574 11.66 8.574 5.487 00 22.63 14.75 22.63 0 0 5.487 14.75 5.487 0 0 5.487 14.75 5.487 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 5.487 14.75 5.487 0 0 5.487 14.75 5.487 0 0 5.487 14.75 5.487 0

0 5.487 8.574 11.66 8.574 5.487 0 0 5.487 8.574 11.66 8.574 5.487 0 0 5.487 8.574 11.66 8.574 5.487 00 5.487 8.574 11.66 11.66 11.66 8.574 5.487 0 0 5.487 8.574 11.66 11.66 11.66 8.574 5.487 0 0 5.487 8.574 11.66 11.66 11.66 8.574 5.487 00 14.75 11.66 11.66 22.63 11.66 11.66 14.75 0 0 14.75 11.66 11.66 22.63 11.66 11.66 14.75 0 0 14.75 11.66 11.66 22.63 11.66 11.66 14.75 00 5.487 8.574 11.66 11.66 11.66 8.574 5.487 0 0 5.487 8.574 11.66 11.66 11.66 8.574 5.487 0 0 5.487 8.574 11.66 11.66 11.66 8.574 5.487 0

0 5.487 8.574 11.66 8.574 5.487 0 0 5.487 8.574 11.66 8.574 5.487 0 0 5.487 8.574 11.66 8.574 5.487 00 5.487 14.75 5.487 0 0 5.487 14.75 5.487 0 0 5.487 14.75 5.487 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 11th Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

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189

Figure 124: Fuel assembly U235 enrichment per node for the 11th core.

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 3.50 3.50 3.50 2.50 2.50 3.00 3.00 3.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.502.50 4.00 4.00 4.00 2.50 2.50 3.50 3.50 3.50 2.50 2.50 3.00 3.00 3.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50

2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50

2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.502.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50

2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50

2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.502.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 11th Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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190

Figure 125: Average burnable poison loading (grams) per node for the 12th core.

0 0 0 0 0 0 0 0 00 8.574 22.12 8.574 0 0 8.574 22.12 8.574 0 0 8.574 22.12 8.574 0

0 8.574 8.574 17.49 8.574 8.574 0 0 8.574 8.574 17.49 8.574 8.574 0 0 8.574 8.574 17.49 8.574 8.574 00 8.574 8.574 17.49 17.49 17.49 8.574 8.574 0 0 8.574 8.574 17.49 17.49 17.49 8.574 8.574 0 0 8.574 8.574 17.49 17.49 17.49 8.574 8.574 00 22.12 17.49 17.49 8.574 17.49 17.49 22.12 0 0 22.12 17.49 17.49 8.574 17.49 17.49 22.12 0 0 22.12 17.49 17.49 8.574 17.49 17.49 22.12 00 8.574 8.574 17.49 17.49 17.49 8.574 8.574 0 0 8.574 8.574 17.49 17.49 17.49 8.574 8.574 0 0 8.574 8.574 17.49 17.49 17.49 8.574 8.574 0

0 8.574 8.574 17.49 8.574 8.574 0 0 8.574 8.574 17.49 8.574 8.574 0 0 8.574 8.574 17.49 8.574 8.574 00 8.574 22.12 8.574 0 0 8.574 22.12 8.574 0 0 8.574 22.12 8.574 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 8.574 22.12 8.574 0 0 10.97 10.97 10.97 0 0 10.97 10.97 10.97 0

0 8.574 8.574 17.49 8.574 8.574 0 0 10.97 10.97 10.97 10.97 10.97 0 0 10.97 10.97 10.97 10.97 10.97 00 8.574 8.574 17.49 17.49 17.49 8.574 8.574 0 0 10.97 10.97 10.97 10.97 10.97 10.97 10.97 0 0 10.97 10.97 10.97 10.97 10.97 10.97 10.97 00 22.12 17.49 17.49 8.574 17.49 17.49 22.12 0 0 10.97 10.97 10.97 10.97 10.97 10.97 10.97 0 0 10.97 10.97 10.97 10.97 10.97 10.97 10.97 00 8.574 8.574 17.49 17.49 17.49 8.574 8.574 0 0 10.97 10.97 10.97 10.97 10.97 10.97 10.97 0 0 10.97 10.97 10.97 10.97 10.97 10.97 10.97 0

0 8.574 8.574 17.49 8.574 8.574 0 0 10.97 10.97 10.97 10.97 10.97 0 0 10.97 10.97 10.97 10.97 10.97 00 8.574 22.12 8.574 0 0 10.97 10.97 10.97 0 0 10.97 10.97 10.97 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 10.97 10.97 10.97 0 0 10.97 10.97 10.97 0 0 10.97 10.97 10.97 0

0 10.97 10.97 10.97 10.97 10.97 0 0 10.97 10.97 10.97 10.97 10.97 0 0 10.97 10.97 10.97 10.97 10.97 00 10.97 10.97 10.97 10.97 10.97 10.97 10.97 0 0 10.97 10.97 10.97 10.97 10.97 10.97 10.97 0 0 10.97 10.97 10.97 10.97 10.97 10.97 10.97 00 10.97 10.97 10.97 10.97 10.97 10.97 10.97 0 0 10.97 10.97 10.97 10.97 10.97 10.97 10.97 0 0 10.97 10.97 10.97 10.97 10.97 10.97 10.97 00 10.97 10.97 10.97 10.97 10.97 10.97 10.97 0 0 10.97 10.97 10.97 10.97 10.97 10.97 10.97 0 0 10.97 10.97 10.97 10.97 10.97 10.97 10.97 0

0 10.97 10.97 10.97 10.97 10.97 0 0 10.97 10.97 10.97 10.97 10.97 0 0 10.97 10.97 10.97 10.97 10.97 00 10.97 10.97 10.97 0 0 10.97 10.97 10.97 0 0 10.97 10.97 10.97 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 12th Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

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191

Figure 126: Fuel assembly U235 enrichment per node for the 12th core.

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 3.50 3.50 3.50 2.50 2.50 3.00 3.00 3.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.502.50 4.00 4.00 4.00 2.50 2.50 3.50 3.50 3.50 2.50 2.50 3.00 3.00 3.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50

2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50

2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.502.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50

2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50

2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 3.00 2.502.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50 2.50 3.00 3.00 3.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 12th Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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192

Figure 127: Average burnable poison loading (grams) per node for the 13th core.

0 0 0 0 0 0 0 0 00 11.32 9.603 11.32 0 0 11.32 9.603 11.32 0 0 11.32 9.603 11.32 0

0 11.32 11.32 7.545 11.32 11.32 0 0 11.32 11.32 7.545 11.32 11.32 0 0 11.32 11.32 7.545 11.32 11.32 00 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 11.32 11.32 7.545 7.545 7.545 11.32 11.32 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0

0 11.32 11.32 7.545 11.32 11.32 0 0 11.32 11.32 7.545 11.32 11.32 0 0 11.32 11.32 7.545 11.32 11.32 00 11.32 9.603 11.32 0 0 11.32 9.603 11.32 0 0 11.32 9.603 11.32 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 11.32 9.603 11.32 0 0 0 9.603 0 0 0 0 9.603 0 0

0 11.32 11.32 7.545 11.32 11.32 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 11.32 11.32 7.545 7.545 7.545 11.32 11.32 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 11.32 11.32 7.545 11.32 11.32 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 11.32 9.603 11.32 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 11.32 0 11.32 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 13th Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

Page 211: SBF in SMRs - MartJustinR2013

193

Figure 128: Fuel assembly U235 enrichment per node for the 13th core.

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.50 3.00 4.50 3.50 4.00 2.50 2.50 4.00 3.50 4.50 3.00 4.50 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 13th Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Page 212: SBF in SMRs - MartJustinR2013

194

Figure 129: Average burnable poison loading (grams) per node for the 14th core.

0 0 0 0 0 0 0 0 00 135.8 51.44 135.8 0 0 135.8 51.44 135.8 0 0 135.8 51.44 135.8 0

0 135.8 135.8 69.96 135.8 135.8 0 0 135.8 135.8 69.96 135.8 135.8 0 0 135.8 135.8 69.96 135.8 135.8 00 135.8 135.8 69.96 69.96 69.96 135.8 135.8 0 0 135.8 135.8 69.96 69.96 69.96 135.8 135.8 0 0 135.8 135.8 69.96 69.96 69.96 135.8 135.8 00 51.44 69.96 69.96 135.8 69.96 69.96 51.44 0 0 51.44 69.96 69.96 135.8 69.96 69.96 51.44 0 0 51.44 69.96 69.96 135.8 69.96 69.96 51.44 00 135.8 135.8 69.96 69.96 69.96 135.8 135.8 0 0 135.8 135.8 69.96 69.96 69.96 135.8 135.8 0 0 135.8 135.8 69.96 69.96 69.96 135.8 135.8 0

0 135.8 135.8 69.96 135.8 135.8 0 0 135.8 135.8 69.96 135.8 135.8 0 0 135.8 135.8 69.96 135.8 135.8 00 135.8 51.44 135.8 0 0 135.8 51.44 135.8 0 0 135.8 51.44 135.8 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 135.8 51.44 135.8 0 0 0 9.603 0 0 0 0 9.603 0 0

0 135.8 135.8 69.96 135.8 135.8 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 135.8 135.8 69.96 69.96 69.96 135.8 135.8 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 51.44 69.96 69.96 135.8 69.96 69.96 51.44 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 135.8 135.8 69.96 69.96 69.96 135.8 135.8 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 135.8 135.8 69.96 135.8 135.8 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 135.8 51.44 135.8 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 11.32 0 11.32 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 14th Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

Page 213: SBF in SMRs - MartJustinR2013

195

Figure 130: Fuel assembly U235 enrichment per node for the 14th core.

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.50 3.00 4.50 3.50 4.00 2.50 2.50 4.00 3.50 4.50 3.00 4.50 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 14th Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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Figure 131: Average burnable poison loading (grams) per node for the 15th core.

0 0 0 0 0 0 0 0 00 32.92 32.92 32.92 0 0 32.92 32.92 32.92 0 0 32.92 32.92 32.92 0

0 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 00 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 32.92 32.92 00 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 32.92 32.92 00 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0

0 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 00 32.92 32.92 32.92 0 0 32.92 32.92 32.92 0 0 32.92 32.92 32.92 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 32.92 32.92 32.92 0 0 0 9.603 0 0 0 0 9.603 0 0

0 32.92 32.92 32.92 32.92 32.92 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 32.92 32.92 32.92 32.92 32.92 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 32.92 32.92 32.92 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 11.32 0 11.32 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 15th Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

Page 215: SBF in SMRs - MartJustinR2013

197

Figure 132: Fuel assembly U235 enrichment per node for the 15th core.

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.50 3.00 4.50 3.50 4.00 2.50 2.50 4.00 3.50 4.50 3.00 4.50 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 15th Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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Figure 133: Average burnable poison loading (grams) per node for the 16th core.

0 0 0 0 0 0 0 0 00 51.44 51.44 51.44 0 0 51.44 51.44 51.44 0 0 51.44 51.44 51.44 0

0 51.44 51.44 51.44 51.44 51.44 0 0 51.44 51.44 51.44 51.44 51.44 0 0 51.44 51.44 51.44 51.44 51.44 00 51.44 51.44 51.44 51.44 51.44 51.44 51.44 0 0 51.44 51.44 51.44 51.44 51.44 51.44 51.44 0 0 51.44 51.44 51.44 51.44 51.44 51.44 51.44 00 51.44 51.44 51.44 51.44 51.44 51.44 51.44 0 0 51.44 51.44 51.44 51.44 51.44 51.44 51.44 0 0 51.44 51.44 51.44 51.44 51.44 51.44 51.44 00 51.44 51.44 51.44 51.44 51.44 51.44 51.44 0 0 51.44 51.44 51.44 51.44 51.44 51.44 51.44 0 0 51.44 51.44 51.44 51.44 51.44 51.44 51.44 0

0 51.44 51.44 51.44 51.44 51.44 0 0 51.44 51.44 51.44 51.44 51.44 0 0 51.44 51.44 51.44 51.44 51.44 00 51.44 51.44 51.44 0 0 51.44 51.44 51.44 0 0 51.44 51.44 51.44 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 51.44 51.44 51.44 0 0 0 9.603 0 0 0 0 9.603 0 0

0 51.44 51.44 51.44 51.44 51.44 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 51.44 51.44 51.44 51.44 51.44 51.44 51.44 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 51.44 51.44 51.44 51.44 51.44 51.44 51.44 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 51.44 51.44 51.44 51.44 51.44 51.44 51.44 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 51.44 51.44 51.44 51.44 51.44 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 51.44 51.44 51.44 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 11.32 0 11.32 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 16th Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

Page 217: SBF in SMRs - MartJustinR2013

199

Figure 134: Fuel assembly U235 enrichment per node for the 16th core.

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.50 3.00 4.50 3.50 4.00 2.50 2.50 4.00 3.50 4.50 3.00 4.50 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 16th Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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Figure 135: Average burnable poison loading (grams) per node for the 17th core.

0 0 0 0 0 0 0 0 00 135.8 51.44 135.8 0 0 135.8 51.44 135.8 0 0 135.8 51.44 135.8 0

0 135.8 135.8 69.96 135.8 135.8 0 0 135.8 135.8 69.96 135.8 135.8 0 0 135.8 135.8 69.96 135.8 135.8 00 135.8 135.8 69.96 69.96 69.96 135.8 135.8 0 0 135.8 135.8 69.96 69.96 69.96 135.8 135.8 0 0 135.8 135.8 69.96 69.96 69.96 135.8 135.8 00 51.44 69.96 69.96 135.8 69.96 69.96 51.44 0 0 51.44 69.96 69.96 135.8 69.96 69.96 51.44 0 0 51.44 69.96 69.96 135.8 69.96 69.96 51.44 00 135.8 135.8 69.96 69.96 69.96 135.8 135.8 0 0 135.8 135.8 69.96 69.96 69.96 135.8 135.8 0 0 135.8 135.8 69.96 69.96 69.96 135.8 135.8 0

0 135.8 135.8 69.96 135.8 135.8 0 0 135.8 135.8 69.96 135.8 135.8 0 0 135.8 135.8 69.96 135.8 135.8 00 135.8 51.44 135.8 0 0 135.8 51.44 135.8 0 0 135.8 51.44 135.8 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 135.8 51.44 135.8 0 0 0 9.603 0 0 0 0 9.603 0 0

0 135.8 135.8 69.96 135.8 135.8 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 135.8 135.8 69.96 69.96 69.96 135.8 135.8 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 51.44 69.96 69.96 135.8 69.96 69.96 51.44 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 135.8 135.8 69.96 69.96 69.96 135.8 135.8 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 135.8 135.8 69.96 135.8 135.8 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 135.8 51.44 135.8 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 11.32 0 11.32 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 17th Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

Page 219: SBF in SMRs - MartJustinR2013

201

Figure 136: Fuel assembly U235 enrichment per node for the 17th core.

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.50 3.00 4.50 3.50 4.00 2.50 2.50 4.00 3.50 4.50 3.00 4.50 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 17th Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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Figure 137: Average burnable poison loading (grams) per node for the 18th core.

0 0 0 0 0 0 0 0 00 32.92 32.92 32.92 0 0 32.92 32.92 32.92 0 0 32.92 32.92 32.92 0

0 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 00 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 32.92 32.92 00 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 32.92 32.92 00 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0

0 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 0 0 32.92 32.92 32.92 32.92 32.92 00 32.92 32.92 32.92 0 0 32.92 32.92 32.92 0 0 32.92 32.92 32.92 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 32.92 32.92 32.92 0 0 0 9.603 0 0 0 0 9.603 0 0

0 32.92 32.92 32.92 32.92 32.92 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 32.92 32.92 32.92 32.92 32.92 32.92 32.92 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 32.92 32.92 32.92 32.92 32.92 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 32.92 32.92 32.92 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 11.32 0 11.32 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 18th Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

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203

Figure 138: Fuel assembly U235 enrichment per node for the 18th core.

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.50 3.00 4.50 3.50 4.00 2.50 2.50 4.00 3.50 4.50 3.00 4.50 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 18th Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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Figure 139: Average burnable poison loading (grams) per node for the 19th core.

0 0 0 0 0 0 0 0 00 51.44 51.44 51.44 0 0 51.44 51.44 51.44 0 0 51.44 51.44 51.44 0

0 51.44 51.44 51.44 51.44 51.44 0 0 51.44 51.44 51.44 51.44 51.44 0 0 51.44 51.44 51.44 51.44 51.44 00 51.44 51.44 51.44 51.44 51.44 51.44 51.44 0 0 51.44 51.44 51.44 51.44 51.44 51.44 51.44 0 0 51.44 51.44 51.44 51.44 51.44 51.44 51.44 00 51.44 51.44 51.44 51.44 51.44 51.44 51.44 0 0 51.44 51.44 51.44 51.44 51.44 51.44 51.44 0 0 51.44 51.44 51.44 51.44 51.44 51.44 51.44 00 51.44 51.44 51.44 51.44 51.44 51.44 51.44 0 0 51.44 51.44 51.44 51.44 51.44 51.44 51.44 0 0 51.44 51.44 51.44 51.44 51.44 51.44 51.44 0

0 51.44 51.44 51.44 51.44 51.44 0 0 51.44 51.44 51.44 51.44 51.44 0 0 51.44 51.44 51.44 51.44 51.44 00 51.44 51.44 51.44 0 0 51.44 51.44 51.44 0 0 51.44 51.44 51.44 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 51.44 51.44 51.44 0 0 0 9.603 0 0 0 0 9.603 0 0

0 51.44 51.44 51.44 51.44 51.44 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 51.44 51.44 51.44 51.44 51.44 51.44 51.44 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 51.44 51.44 51.44 51.44 51.44 51.44 51.44 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 51.44 51.44 51.44 51.44 51.44 51.44 51.44 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 51.44 51.44 51.44 51.44 51.44 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 51.44 51.44 51.44 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 11.32 0 11.32 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 19th Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

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Figure 140: Fuel assembly U235 enrichment per node for the 19th core.

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.50 3.00 4.50 3.50 4.00 2.50 2.50 4.00 3.50 4.50 3.00 4.50 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 19th Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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206

Figure 141: Average burnable poison loading (grams) per node for the 20th core.

0 0 0 0 0 0 0 0 00 69.96 69.96 69.96 0 0 69.96 69.96 69.96 0 0 69.96 69.96 69.96 0

0 69.96 69.96 69.96 69.96 69.96 0 0 69.96 69.96 69.96 69.96 69.96 0 0 69.96 69.96 69.96 69.96 69.96 00 69.96 69.96 69.96 69.96 69.96 69.96 69.96 0 0 69.96 69.96 69.96 69.96 69.96 69.96 69.96 0 0 69.96 69.96 69.96 69.96 69.96 69.96 69.96 00 69.96 69.96 69.96 69.96 69.96 69.96 69.96 0 0 69.96 69.96 69.96 69.96 69.96 69.96 69.96 0 0 69.96 69.96 69.96 69.96 69.96 69.96 69.96 00 69.96 69.96 69.96 69.96 69.96 69.96 69.96 0 0 69.96 69.96 69.96 69.96 69.96 69.96 69.96 0 0 69.96 69.96 69.96 69.96 69.96 69.96 69.96 0

0 69.96 69.96 69.96 69.96 69.96 0 0 69.96 69.96 69.96 69.96 69.96 0 0 69.96 69.96 69.96 69.96 69.96 00 69.96 69.96 69.96 0 0 69.96 69.96 69.96 0 0 69.96 69.96 69.96 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 69.96 69.96 69.96 0 0 0 9.603 0 0 0 0 9.603 0 0

0 69.96 69.96 69.96 69.96 69.96 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 69.96 69.96 69.96 69.96 69.96 69.96 69.96 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 69.96 69.96 69.96 69.96 69.96 69.96 69.96 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 69.96 69.96 69.96 69.96 69.96 69.96 69.96 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 69.96 69.96 69.96 69.96 69.96 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 69.96 69.96 69.96 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 11.32 0 11.32 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 20th Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

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Figure 142: Fuel assembly U235 enrichment per node for the 20th core.

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.50 3.00 4.50 3.50 4.00 2.50 2.50 4.00 3.50 4.50 3.00 4.50 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 20th Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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208

Figure 143: Average burnable poison loading (grams) per node for the 21st core.

0 0 0 0 0 0 0 0 00 88.48 88.48 88.48 0 0 88.48 88.48 88.48 0 0 88.48 88.48 88.48 0

0 88.48 88.48 88.48 88.48 88.48 0 0 88.48 88.48 88.48 88.48 88.48 0 0 88.48 88.48 88.48 88.48 88.48 00 88.48 88.48 88.48 88.48 88.48 88.48 88.48 0 0 88.48 88.48 88.48 88.48 88.48 88.48 88.48 0 0 88.48 88.48 88.48 88.48 88.48 88.48 88.48 00 88.48 88.48 88.48 88.48 88.48 88.48 88.48 0 0 88.48 88.48 88.48 88.48 88.48 88.48 88.48 0 0 88.48 88.48 88.48 88.48 88.48 88.48 88.48 00 88.48 88.48 88.48 88.48 88.48 88.48 88.48 0 0 88.48 88.48 88.48 88.48 88.48 88.48 88.48 0 0 88.48 88.48 88.48 88.48 88.48 88.48 88.48 0

0 88.48 88.48 88.48 88.48 88.48 0 0 88.48 88.48 88.48 88.48 88.48 0 0 88.48 88.48 88.48 88.48 88.48 00 88.48 88.48 88.48 0 0 88.48 88.48 88.48 0 0 88.48 88.48 88.48 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 88.48 88.48 88.48 0 0 0 9.603 0 0 0 0 9.603 0 0

0 88.48 88.48 88.48 88.48 88.48 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 88.48 88.48 88.48 88.48 88.48 88.48 88.48 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 88.48 88.48 88.48 88.48 88.48 88.48 88.48 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 88.48 88.48 88.48 88.48 88.48 88.48 88.48 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 88.48 88.48 88.48 88.48 88.48 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 88.48 88.48 88.48 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 11.32 0 11.32 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 21st Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

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Figure 144: Fuel assembly U235 enrichment per node for the 21st core.

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.50 3.00 4.50 3.50 4.00 2.50 2.50 4.00 3.50 4.50 3.00 4.50 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 21st Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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Figure 145: Average burnable poison loading (grams) per node for the 22nd core.

0 0 0 0 0 0 0 0 00 135.8 135.8 135.8 0 0 135.8 135.8 135.8 0 0 135.8 135.8 135.8 0

0 135.8 135.8 135.8 135.8 135.8 0 0 135.8 135.8 135.8 135.8 135.8 0 0 135.8 135.8 135.8 135.8 135.8 00 135.8 135.8 135.8 135.8 135.8 135.8 135.8 0 0 135.8 135.8 135.8 135.8 135.8 135.8 135.8 0 0 135.8 135.8 135.8 135.8 135.8 135.8 135.8 00 135.8 135.8 135.8 135.8 135.8 135.8 135.8 0 0 135.8 135.8 135.8 135.8 135.8 135.8 135.8 0 0 135.8 135.8 135.8 135.8 135.8 135.8 135.8 00 135.8 135.8 135.8 135.8 135.8 135.8 135.8 0 0 135.8 135.8 135.8 135.8 135.8 135.8 135.8 0 0 135.8 135.8 135.8 135.8 135.8 135.8 135.8 0

0 135.8 135.8 135.8 135.8 135.8 0 0 135.8 135.8 135.8 135.8 135.8 0 0 135.8 135.8 135.8 135.8 135.8 00 135.8 135.8 135.8 0 0 135.8 135.8 135.8 0 0 135.8 135.8 135.8 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 135.8 135.8 135.8 0 0 0 9.603 0 0 0 0 9.603 0 0

0 135.8 135.8 135.8 135.8 135.8 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 135.8 135.8 135.8 135.8 135.8 135.8 135.8 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 135.8 135.8 135.8 135.8 135.8 135.8 135.8 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 135.8 135.8 135.8 135.8 135.8 135.8 135.8 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 135.8 135.8 135.8 135.8 135.8 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 135.8 135.8 135.8 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 00 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 0 0 9.603 7.545 7.545 11.32 7.545 7.545 9.603 00 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0 0 0 4.801 7.545 7.545 7.545 4.801 0 0

0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 0 0 0 4.801 7.545 4.801 0 00 0 9.603 0 0 0 0 9.603 0 0 0 0 9.603 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 9.603 7.545 9.603 9.603 9.603 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0 0 4.801 9.603 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 00 9.603 7.545 9.603 9.603 9.603 7.545 9.603 0 0 0 0 11.32 0 11.32 0 0 0 0 0 0 11.32 0 11.32 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 9.603 11.32 9.603 0 0 0 0 0 0 9.603 11.32 9.603 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 0 0 0 9.603 0 0 9.603 0 0 0 9.603 00 4.801 9.603 4.801 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 11.32 0 11.32 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 9.603 11.32 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 0 0 0 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 22nd Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

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211

Figure 146: Fuel assembly U235 enrichment per node for the 22nd core.

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 4.95 4.95 2.502.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50 2.50 4.95 4.95 4.95 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.95 4.95 4.95 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.50 2.50 3.00 2.50 2.50 2.50 2.50 2.50 3.00 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50 2.50 2.50 3.00 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.502.50 4.00 3.50 4.00 3.00 4.00 3.50 4.00 2.50 2.50 4.00 3.50 4.50 3.00 4.50 3.50 4.00 2.50 2.50 4.00 3.50 4.50 3.00 4.50 3.50 4.00 2.502.50 4.50 3.50 3.50 4.00 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 4.50 3.50 3.50 4.50 2.50

2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.50 2.50 4.50 3.50 3.50 3.50 4.50 2.502.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50 2.50 4.50 4.00 4.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 22nd Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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Figure 147: Average burnable poison loading (grams) per node for the 23rd core.

5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.4875.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487

5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.4875.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.4875.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.4875.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487

5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.4875.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487

5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487

5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.4875.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487

5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.4875.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.4875.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.4875.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487

5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.4875.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487

5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487

5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.4875.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487

5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.4875.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.4875.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.4875.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487

5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.4875.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487

5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487

0 0 0 0 0 0 0 0 00 4.801 4.801 4.801 0 0 4.801 4.801 4.801 0 0 4.801 4.801 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 4.801 7.545 9.603 9.603 9.603 7.545 4.801 0 0 4.801 7.545 9.603 9.603 9.603 7.545 4.801 0 0 4.801 7.545 9.603 9.603 9.603 7.545 4.801 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 4.801 4.801 0 0 4.801 4.801 4.801 0 0 4.801 4.801 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 4.801 4.801 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 4.801 7.545 9.603 9.603 9.603 7.545 4.801 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 4.801 4.801 4.801 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 23rd Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

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Figure 148: Fuel assembly U235 enrichment per node for the 23rd core.

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 23rd Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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Figure 149: Average burnable poison loading (grams) per node for the 24th core.

5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.4875.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487

5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.4875.487 5.487 4.801 5.487 5.487 5.487 4.801 5.487 5.487 5.487 5.487 4.801 5.487 5.487 5.487 4.801 5.487 5.487 5.487 5.487 4.801 5.487 5.487 5.487 4.801 5.487 5.4875.487 5.487 4.801 5.487 4.801 5.487 4.801 5.487 5.487 5.487 5.487 4.801 5.487 4.801 5.487 4.801 5.487 5.487 5.487 5.487 4.801 5.487 4.801 5.487 4.801 5.487 5.4875.487 5.487 4.801 5.487 5.487 5.487 4.801 5.487 5.487 5.487 5.487 4.801 5.487 5.487 5.487 4.801 5.487 5.487 5.487 5.487 4.801 5.487 5.487 5.487 4.801 5.487 5.487

5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.4875.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487

5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487

5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.4875.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487

5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.4875.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.4875.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.4875.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487

5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.4875.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487

5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487

5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.4875.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487

5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.4875.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.4875.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.4875.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 4.801 4.801 5.487 5.487

5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.487 5.487 5.487 4.801 4.801 4.801 5.487 5.4875.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487

5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487 5.487

0 0 0 0 0 0 0 0 00 4.801 4.801 4.801 0 0 4.801 4.801 4.801 0 0 4.801 4.801 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 00 4.801 7.545 9.603 9.603 9.603 7.545 4.801 0 0 4.801 7.545 9.603 9.603 9.603 7.545 4.801 0 0 4.801 7.545 9.603 9.603 9.603 7.545 4.801 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0

0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 0 0 9.603 7.545 7.545 7.545 9.603 00 4.801 4.801 4.801 0 0 4.801 4.801 4.801 0 0 4.801 4.801 4.801 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 4.801 4.801 4.801 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 4.801 7.545 9.603 9.603 9.603 7.545 4.801 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 4.801 7.545 7.545 9.603 7.545 7.545 4.801 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 9.603 7.545 7.545 7.545 9.603 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 4.801 4.801 4.801 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 24th Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

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215

Figure 150: Fuel assembly U235 enrichment per node for the 24th core.

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 24th Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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Figure 151: Average burnable poison loading (grams) per node for the 25th core.

4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.8014.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801

4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.8014.801 5.487 10.97 4.801 4.801 4.801 10.97 5.487 4.801 4.801 5.487 10.97 4.801 4.801 4.801 10.97 5.487 4.801 4.801 5.487 10.97 4.801 4.801 4.801 10.97 5.487 4.8014.801 5.487 10.97 4.801 10.97 4.801 10.97 5.487 4.801 4.801 5.487 10.97 4.801 10.97 4.801 10.97 5.487 4.801 4.801 5.487 10.97 4.801 10.97 4.801 10.97 5.487 4.8014.801 5.487 10.97 4.801 4.801 4.801 10.97 5.487 4.801 4.801 5.487 10.97 4.801 4.801 4.801 10.97 5.487 4.801 4.801 5.487 10.97 4.801 4.801 4.801 10.97 5.487 4.801

4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.8014.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801

4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801

4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.8014.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801

4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.8014.801 5.487 10.97 4.801 4.801 4.801 10.97 5.487 4.801 4.801 5.487 10.97 4.801 4.801 4.801 10.97 5.487 4.801 4.801 5.487 10.97 4.801 4.801 4.801 10.97 5.487 4.8014.801 5.487 10.97 4.801 10.97 4.801 10.97 5.487 4.801 4.801 5.487 10.97 4.801 10.97 4.801 10.97 5.487 4.801 4.801 5.487 10.97 4.801 10.97 4.801 10.97 5.487 4.8014.801 5.487 10.97 4.801 4.801 4.801 10.97 5.487 4.801 4.801 5.487 10.97 4.801 4.801 4.801 10.97 5.487 4.801 4.801 5.487 10.97 4.801 4.801 4.801 10.97 5.487 4.801

4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.8014.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801

4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801

4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.8014.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801

4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.8014.801 5.487 10.97 4.801 4.801 4.801 10.97 5.487 4.801 4.801 5.487 10.97 4.801 4.801 4.801 10.97 5.487 4.801 4.801 5.487 10.97 4.801 4.801 4.801 10.97 5.487 4.8014.801 5.487 10.97 4.801 10.97 4.801 10.97 5.487 4.801 4.801 5.487 10.97 4.801 10.97 4.801 10.97 5.487 4.801 4.801 5.487 10.97 4.801 10.97 4.801 10.97 5.487 4.8014.801 5.487 10.97 4.801 4.801 4.801 10.97 5.487 4.801 4.801 5.487 10.97 4.801 4.801 4.801 10.97 5.487 4.801 4.801 5.487 10.97 4.801 4.801 4.801 10.97 5.487 4.801

4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.8014.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801

4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 25th Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

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Figure 152: Fuel assembly U235 enrichment per node for the 25th core.

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 25th Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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218

Figure 153: Average burnable poison loading (grams) per node for the 26th core.

4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.8014.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801

4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.8014.801 5.487 10.97 13.38 13.38 13.38 10.97 5.487 4.801 4.801 5.487 10.97 13.38 13.38 13.38 10.97 5.487 4.801 4.801 5.487 10.97 13.38 13.38 13.38 10.97 5.487 4.8014.801 5.487 10.97 13.38 10.97 13.38 10.97 5.487 4.801 4.801 5.487 10.97 13.38 10.97 13.38 10.97 5.487 4.801 4.801 5.487 10.97 13.38 10.97 13.38 10.97 5.487 4.8014.801 5.487 10.97 13.38 13.38 13.38 10.97 5.487 4.801 4.801 5.487 10.97 13.38 13.38 13.38 10.97 5.487 4.801 4.801 5.487 10.97 13.38 13.38 13.38 10.97 5.487 4.801

4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.8014.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801

4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801

4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.8014.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801

4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.8014.801 5.487 10.97 13.38 13.38 13.38 10.97 5.487 4.801 4.801 5.487 10.97 13.38 13.38 13.38 10.97 5.487 4.801 4.801 5.487 10.97 13.38 13.38 13.38 10.97 5.487 4.8014.801 5.487 10.97 13.38 10.97 13.38 10.97 5.487 4.801 4.801 5.487 10.97 13.38 10.97 13.38 10.97 5.487 4.801 4.801 5.487 10.97 13.38 10.97 13.38 10.97 5.487 4.8014.801 5.487 10.97 13.38 13.38 13.38 10.97 5.487 4.801 4.801 5.487 10.97 13.38 13.38 13.38 10.97 5.487 4.801 4.801 5.487 10.97 13.38 13.38 13.38 10.97 5.487 4.801

4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.8014.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801

4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801

4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.8014.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801

4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.8014.801 5.487 10.97 13.38 13.38 13.38 10.97 5.487 4.801 4.801 5.487 10.97 13.38 13.38 13.38 10.97 5.487 4.801 4.801 5.487 10.97 13.38 13.38 13.38 10.97 5.487 4.8014.801 5.487 10.97 13.38 10.97 13.38 10.97 5.487 4.801 4.801 5.487 10.97 13.38 10.97 13.38 10.97 5.487 4.801 4.801 5.487 10.97 13.38 10.97 13.38 10.97 5.487 4.8014.801 5.487 10.97 13.38 13.38 13.38 10.97 5.487 4.801 4.801 5.487 10.97 13.38 13.38 13.38 10.97 5.487 4.801 4.801 5.487 10.97 13.38 13.38 13.38 10.97 5.487 4.801

4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.8014.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801

4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 26th Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

Page 237: SBF in SMRs - MartJustinR2013

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Figure 154: Fuel assembly U235 enrichment per node for the 26th core.

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 26th Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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Figure 155: Average burnable poison loading (grams) per node for the 27th core.

4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.8014.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801

4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.8014.801 5.487 10.97 16.46 16.46 16.46 10.97 5.487 4.801 4.801 5.487 10.97 16.46 16.46 16.46 10.97 5.487 4.801 4.801 5.487 10.97 16.46 16.46 16.46 10.97 5.487 4.8014.801 5.487 10.97 16.46 10.97 16.46 10.97 5.487 4.801 4.801 5.487 10.97 16.46 10.97 16.46 10.97 5.487 4.801 4.801 5.487 10.97 16.46 10.97 16.46 10.97 5.487 4.8014.801 5.487 10.97 16.46 16.46 16.46 10.97 5.487 4.801 4.801 5.487 10.97 16.46 16.46 16.46 10.97 5.487 4.801 4.801 5.487 10.97 16.46 16.46 16.46 10.97 5.487 4.801

4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.8014.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801

4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801

4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.8014.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801

4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.8014.801 5.487 10.97 16.46 16.46 16.46 10.97 5.487 4.801 4.801 5.487 10.97 16.46 16.46 16.46 10.97 5.487 4.801 4.801 5.487 10.97 16.46 16.46 16.46 10.97 5.487 4.8014.801 5.487 10.97 16.46 10.97 16.46 10.97 5.487 4.801 4.801 5.487 10.97 16.46 10.97 16.46 10.97 5.487 4.801 4.801 5.487 10.97 16.46 10.97 16.46 10.97 5.487 4.8014.801 5.487 10.97 16.46 16.46 16.46 10.97 5.487 4.801 4.801 5.487 10.97 16.46 16.46 16.46 10.97 5.487 4.801 4.801 5.487 10.97 16.46 16.46 16.46 10.97 5.487 4.801

4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.8014.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801

4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801

4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.8014.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801

4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.8014.801 5.487 10.97 16.46 16.46 16.46 10.97 5.487 4.801 4.801 5.487 10.97 16.46 16.46 16.46 10.97 5.487 4.801 4.801 5.487 10.97 16.46 16.46 16.46 10.97 5.487 4.8014.801 5.487 10.97 16.46 10.97 16.46 10.97 5.487 4.801 4.801 5.487 10.97 16.46 10.97 16.46 10.97 5.487 4.801 4.801 5.487 10.97 16.46 10.97 16.46 10.97 5.487 4.8014.801 5.487 10.97 16.46 16.46 16.46 10.97 5.487 4.801 4.801 5.487 10.97 16.46 16.46 16.46 10.97 5.487 4.801 4.801 5.487 10.97 16.46 16.46 16.46 10.97 5.487 4.801

4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.801 4.801 5.487 10.97 10.97 10.97 5.487 4.8014.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801 4.801 5.487 5.487 5.487 4.801

4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 27th Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

Page 239: SBF in SMRs - MartJustinR2013

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Figure 156: Fuel assembly U235 enrichment per node for the 27th core.

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 27th Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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Figure 157: Average burnable poison loading (grams) per node for the 28th core.

4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.8014.801 13.38 13.38 13.38 4.801 4.801 13.38 13.38 13.38 4.801 4.801 13.38 13.38 13.38 4.801

4.801 13.38 10.97 10.97 10.97 13.38 4.801 4.801 13.38 10.97 10.97 10.97 13.38 4.801 4.801 13.38 10.97 10.97 10.97 13.38 4.8014.801 13.38 10.97 16.46 16.46 16.46 10.97 13.38 4.801 4.801 13.38 10.97 16.46 16.46 16.46 10.97 13.38 4.801 4.801 13.38 10.97 16.46 16.46 16.46 10.97 13.38 4.8014.801 13.38 10.97 16.46 10.97 16.46 10.97 13.38 4.801 4.801 13.38 10.97 16.46 10.97 16.46 10.97 13.38 4.801 4.801 13.38 10.97 16.46 10.97 16.46 10.97 13.38 4.8014.801 13.38 10.97 16.46 16.46 16.46 10.97 13.38 4.801 4.801 13.38 10.97 16.46 16.46 16.46 10.97 13.38 4.801 4.801 13.38 10.97 16.46 16.46 16.46 10.97 13.38 4.801

4.801 13.38 10.97 10.97 10.97 13.38 4.801 4.801 13.38 10.97 10.97 10.97 13.38 4.801 4.801 13.38 10.97 10.97 10.97 13.38 4.8014.801 13.38 13.38 13.38 4.801 4.801 13.38 13.38 13.38 4.801 4.801 13.38 13.38 13.38 4.801

4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801

4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.8014.801 13.38 13.38 13.38 4.801 4.801 13.38 13.38 13.38 4.801 4.801 13.38 13.38 13.38 4.801

4.801 13.38 10.97 10.97 10.97 13.38 4.801 4.801 13.38 10.97 10.97 10.97 13.38 4.801 4.801 13.38 10.97 10.97 10.97 13.38 4.8014.801 13.38 10.97 16.46 16.46 16.46 10.97 13.38 4.801 4.801 13.38 10.97 16.46 16.46 16.46 10.97 13.38 4.801 4.801 13.38 10.97 16.46 16.46 16.46 10.97 13.38 4.8014.801 13.38 10.97 16.46 10.97 16.46 10.97 13.38 4.801 4.801 13.38 10.97 16.46 10.97 16.46 10.97 13.38 4.801 4.801 13.38 10.97 16.46 10.97 16.46 10.97 13.38 4.8014.801 13.38 10.97 16.46 16.46 16.46 10.97 13.38 4.801 4.801 13.38 10.97 16.46 16.46 16.46 10.97 13.38 4.801 4.801 13.38 10.97 16.46 16.46 16.46 10.97 13.38 4.801

4.801 13.38 10.97 10.97 10.97 13.38 4.801 4.801 13.38 10.97 10.97 10.97 13.38 4.801 4.801 13.38 10.97 10.97 10.97 13.38 4.8014.801 13.38 13.38 13.38 4.801 4.801 13.38 13.38 13.38 4.801 4.801 13.38 13.38 13.38 4.801

4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801

4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.8014.801 13.38 13.38 13.38 4.801 4.801 13.38 13.38 13.38 4.801 4.801 13.38 13.38 13.38 4.801

4.801 13.38 10.97 10.97 10.97 13.38 4.801 4.801 13.38 10.97 10.97 10.97 13.38 4.801 4.801 13.38 10.97 10.97 10.97 13.38 4.8014.801 13.38 10.97 16.46 16.46 16.46 10.97 13.38 4.801 4.801 13.38 10.97 16.46 16.46 16.46 10.97 13.38 4.801 4.801 13.38 10.97 16.46 16.46 16.46 10.97 13.38 4.8014.801 13.38 10.97 16.46 10.97 16.46 10.97 13.38 4.801 4.801 13.38 10.97 16.46 10.97 16.46 10.97 13.38 4.801 4.801 13.38 10.97 16.46 10.97 16.46 10.97 13.38 4.8014.801 13.38 10.97 16.46 16.46 16.46 10.97 13.38 4.801 4.801 13.38 10.97 16.46 16.46 16.46 10.97 13.38 4.801 4.801 13.38 10.97 16.46 16.46 16.46 10.97 13.38 4.801

4.801 13.38 10.97 10.97 10.97 13.38 4.801 4.801 13.38 10.97 10.97 10.97 13.38 4.801 4.801 13.38 10.97 10.97 10.97 13.38 4.8014.801 13.38 13.38 13.38 4.801 4.801 13.38 13.38 13.38 4.801 4.801 13.38 13.38 13.38 4.801

4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 28th Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

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223

Figure 158: Fuel assembly U235 enrichment per node for the 28th core.

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 28th Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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Figure 159: Average burnable poison loading (grams) per node for the 29th core.

4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.8014.801 14.4 14.4 14.4 4.801 4.801 14.4 14.4 14.4 4.801 4.801 14.4 14.4 14.4 4.801

4.801 14.4 16.46 16.46 16.46 14.4 4.801 4.801 14.4 16.46 16.46 16.46 14.4 4.801 4.801 14.4 16.46 16.46 16.46 14.4 4.8014.801 14.4 16.46 16.46 16.46 16.46 16.46 14.4 4.801 4.801 14.4 16.46 16.46 16.46 16.46 16.46 14.4 4.801 4.801 14.4 16.46 16.46 16.46 16.46 16.46 14.4 4.8014.801 14.4 16.46 16.46 16.46 16.46 16.46 14.4 4.801 4.801 14.4 16.46 16.46 16.46 16.46 16.46 14.4 4.801 4.801 14.4 16.46 16.46 16.46 16.46 16.46 14.4 4.8014.801 14.4 16.46 16.46 16.46 16.46 16.46 14.4 4.801 4.801 14.4 16.46 16.46 16.46 16.46 16.46 14.4 4.801 4.801 14.4 16.46 16.46 16.46 16.46 16.46 14.4 4.801

4.801 14.4 16.46 16.46 16.46 14.4 4.801 4.801 14.4 16.46 16.46 16.46 14.4 4.801 4.801 14.4 16.46 16.46 16.46 14.4 4.8014.801 14.4 14.4 14.4 4.801 4.801 14.4 14.4 14.4 4.801 4.801 14.4 14.4 14.4 4.801

4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801

4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.8014.801 14.4 14.4 14.4 4.801 4.801 14.4 14.4 14.4 4.801 4.801 14.4 14.4 14.4 4.801

4.801 14.4 16.46 16.46 16.46 14.4 4.801 4.801 14.4 16.46 16.46 16.46 14.4 4.801 4.801 14.4 16.46 16.46 16.46 14.4 4.8014.801 14.4 16.46 16.46 16.46 16.46 16.46 14.4 4.801 4.801 14.4 16.46 16.46 16.46 16.46 16.46 14.4 4.801 4.801 14.4 16.46 16.46 16.46 16.46 16.46 14.4 4.8014.801 14.4 16.46 16.46 16.46 16.46 16.46 14.4 4.801 4.801 14.4 16.46 16.46 16.46 16.46 16.46 14.4 4.801 4.801 14.4 16.46 16.46 16.46 16.46 16.46 14.4 4.8014.801 14.4 16.46 16.46 16.46 16.46 16.46 14.4 4.801 4.801 14.4 16.46 16.46 16.46 16.46 16.46 14.4 4.801 4.801 14.4 16.46 16.46 16.46 16.46 16.46 14.4 4.801

4.801 14.4 16.46 16.46 16.46 14.4 4.801 4.801 14.4 16.46 16.46 16.46 14.4 4.801 4.801 14.4 16.46 16.46 16.46 14.4 4.8014.801 14.4 14.4 14.4 4.801 4.801 14.4 14.4 14.4 4.801 4.801 14.4 14.4 14.4 4.801

4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801 4.801

4.801 4.801 4.801 4.801 4.801 4.801 0 0 04.801 14.4 14.4 14.4 4.801 4.801 14.4 14.4 14.4 4.801 0 14.4 14.4 14.4 0

4.801 14.4 16.46 16.46 16.46 14.4 4.801 4.801 14.4 16.46 16.46 16.46 14.4 4.801 0 14.4 16.46 16.46 16.46 14.4 04.801 14.4 16.46 16.46 16.46 16.46 16.46 14.4 4.801 4.801 14.4 16.46 16.46 16.46 16.46 16.46 14.4 4.801 0 14.4 16.46 16.46 16.46 16.46 16.46 14.4 04.801 14.4 16.46 16.46 16.46 16.46 16.46 14.4 4.801 4.801 14.4 16.46 16.46 16.46 16.46 16.46 14.4 4.801 0 14.4 16.46 16.46 16.46 16.46 16.46 14.4 04.801 14.4 16.46 16.46 16.46 16.46 16.46 14.4 4.801 4.801 14.4 16.46 16.46 16.46 16.46 16.46 14.4 4.801 0 14.4 16.46 16.46 16.46 16.46 16.46 14.4 0

4.801 14.4 16.46 16.46 16.46 14.4 4.801 4.801 14.4 16.46 16.46 16.46 14.4 4.801 0 14.4 16.46 16.46 16.46 14.4 04.801 14.4 14.4 14.4 4.801 4.801 14.4 14.4 14.4 4.801 0 14.4 14.4 14.4 0

4.801 4.801 4.801 4.801 4.801 4.801 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 29th Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

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Figure 160: Fuel assembly U235 enrichment per node for the 29th core.

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.504.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 4.95 4.95 4.95 2.50

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 4.95 4.95 4.95 4.95 4.95 2.504.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.504.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.504.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 4.95 4.95 4.95 4.95 4.95 2.504.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 2.50 4.95 4.95 4.95 2.50

4.95 4.95 4.95 4.95 4.95 4.95 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 29th Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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Figure 161: Average burnable poison loading (grams) per node for the 30th core.

16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.4616.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46

16.46 14.4 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 14.4 16.4616.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.4616.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.4616.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46

16.46 14.4 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 14.4 16.4616.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46

16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.46

16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.4616.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46

16.46 14.4 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 14.4 16.4616.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.4616.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.4616.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46

16.46 14.4 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 14.4 16.4616.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46

16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.46

16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.4616.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46

16.46 14.4 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 14.4 16.4616.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.4616.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.4616.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 16.46 16.46 14.4 16.46

16.46 14.4 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 14.4 16.46 16.46 14.4 16.46 16.46 16.46 14.4 16.4616.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46

16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.46

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 30th Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

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Figure 162: Fuel assembly U235 enrichment per node for the 30th core.

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 30th Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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Figure 163: Average burnable poison loading (grams) per node for the 31st core.

16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.4616.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46

16.46 14.4 17.49 17.49 17.49 14.4 16.46 16.46 14.4 17.49 17.49 17.49 14.4 16.46 16.46 14.4 17.49 17.49 17.49 14.4 16.4616.46 14.4 17.49 16.46 16.46 16.46 17.49 14.4 16.46 16.46 14.4 17.49 16.46 16.46 16.46 17.49 14.4 16.46 16.46 14.4 17.49 16.46 16.46 16.46 17.49 14.4 16.4616.46 14.4 17.49 16.46 17.49 16.46 17.49 14.4 16.46 16.46 14.4 17.49 16.46 17.49 16.46 17.49 14.4 16.46 16.46 14.4 17.49 16.46 17.49 16.46 17.49 14.4 16.4616.46 14.4 17.49 16.46 16.46 16.46 17.49 14.4 16.46 16.46 14.4 17.49 16.46 16.46 16.46 17.49 14.4 16.46 16.46 14.4 17.49 16.46 16.46 16.46 17.49 14.4 16.46

16.46 14.4 17.49 17.49 17.49 14.4 16.46 16.46 14.4 17.49 17.49 17.49 14.4 16.46 16.46 14.4 17.49 17.49 17.49 14.4 16.4616.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46

16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.46

16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.4616.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46

16.46 14.4 17.49 17.49 17.49 14.4 16.46 16.46 14.4 17.49 17.49 17.49 14.4 16.46 16.46 14.4 17.49 17.49 17.49 14.4 16.4616.46 14.4 17.49 16.46 16.46 16.46 17.49 14.4 16.46 16.46 14.4 17.49 16.46 16.46 16.46 17.49 14.4 16.46 16.46 14.4 17.49 16.46 16.46 16.46 17.49 14.4 16.4616.46 14.4 17.49 16.46 17.49 16.46 17.49 14.4 16.46 16.46 14.4 17.49 16.46 17.49 16.46 17.49 14.4 16.46 16.46 14.4 17.49 16.46 17.49 16.46 17.49 14.4 16.4616.46 14.4 17.49 16.46 16.46 16.46 17.49 14.4 16.46 16.46 14.4 17.49 16.46 16.46 16.46 17.49 14.4 16.46 16.46 14.4 17.49 16.46 16.46 16.46 17.49 14.4 16.46

16.46 14.4 17.49 17.49 17.49 14.4 16.46 16.46 14.4 17.49 17.49 17.49 14.4 16.46 16.46 14.4 17.49 17.49 17.49 14.4 16.4616.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46

16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.46

16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.4616.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46

16.46 14.4 17.49 17.49 17.49 14.4 16.46 16.46 14.4 17.49 17.49 17.49 14.4 16.46 16.46 14.4 17.49 17.49 17.49 14.4 16.4616.46 14.4 17.49 16.46 16.46 16.46 17.49 14.4 16.46 16.46 14.4 17.49 16.46 16.46 16.46 17.49 14.4 16.46 16.46 14.4 17.49 16.46 16.46 16.46 17.49 14.4 16.4616.46 14.4 17.49 16.46 17.49 16.46 17.49 14.4 16.46 16.46 14.4 17.49 16.46 17.49 16.46 17.49 14.4 16.46 16.46 14.4 17.49 16.46 17.49 16.46 17.49 14.4 16.4616.46 14.4 17.49 16.46 16.46 16.46 17.49 14.4 16.46 16.46 14.4 17.49 16.46 16.46 16.46 17.49 14.4 16.46 16.46 14.4 17.49 16.46 16.46 16.46 17.49 14.4 16.46

16.46 14.4 17.49 17.49 17.49 14.4 16.46 16.46 14.4 17.49 17.49 17.49 14.4 16.46 16.46 14.4 17.49 17.49 17.49 14.4 16.4616.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46 16.46 14.4 14.4 14.4 16.46

16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.46 16.46

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 31th Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

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Figure 164: Fuel assembly U235 enrichment per node for the 31st core.

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 31th Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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Figure 165: Average burnable poison loading (grams) per node for the 33rd core.

17.49 17.49 17.49 17.49 17.49 17.49 17.49 17.49 17.4917.49 14.4 14.4 14.4 17.49 17.49 14.4 14.4 14.4 17.49 17.49 14.4 14.4 14.4 17.49

17.49 14.4 17.49 17.49 17.49 14.4 17.49 17.49 14.4 17.49 17.49 17.49 14.4 17.49 17.49 14.4 17.49 17.49 17.49 14.4 17.4917.49 14.4 17.49 16.46 16.46 16.46 17.49 14.4 17.49 17.49 14.4 17.49 16.46 16.46 16.46 17.49 14.4 17.49 17.49 14.4 17.49 16.46 16.46 16.46 17.49 14.4 17.4917.49 14.4 17.49 16.46 17.49 16.46 17.49 14.4 17.49 17.49 14.4 17.49 16.46 17.49 16.46 17.49 14.4 17.49 17.49 14.4 17.49 16.46 17.49 16.46 17.49 14.4 17.4917.49 14.4 17.49 16.46 16.46 16.46 17.49 14.4 17.49 17.49 14.4 17.49 16.46 16.46 16.46 17.49 14.4 17.49 17.49 14.4 17.49 16.46 16.46 16.46 17.49 14.4 17.49

17.49 14.4 17.49 17.49 17.49 14.4 17.49 17.49 14.4 17.49 17.49 17.49 14.4 17.49 17.49 14.4 17.49 17.49 17.49 14.4 17.4917.49 14.4 14.4 14.4 17.49 17.49 14.4 14.4 14.4 17.49 17.49 14.4 14.4 14.4 17.49

17.49 17.49 17.49 17.49 17.49 17.49 17.49 17.49 17.49

17.49 17.49 17.49 17.49 17.49 17.49 17.49 17.49 17.4917.49 14.4 14.4 14.4 17.49 17.49 14.4 14.4 14.4 17.49 17.49 14.4 14.4 14.4 17.49

17.49 14.4 17.49 17.49 17.49 14.4 17.49 17.49 14.4 17.49 17.49 17.49 14.4 17.49 17.49 14.4 17.49 17.49 17.49 14.4 17.4917.49 14.4 17.49 16.46 16.46 16.46 17.49 14.4 17.49 17.49 14.4 17.49 16.46 16.46 16.46 17.49 14.4 17.49 17.49 14.4 17.49 16.46 16.46 16.46 17.49 14.4 17.4917.49 14.4 17.49 16.46 17.49 16.46 17.49 14.4 17.49 17.49 14.4 17.49 16.46 17.49 16.46 17.49 14.4 17.49 17.49 14.4 17.49 16.46 17.49 16.46 17.49 14.4 17.4917.49 14.4 17.49 16.46 16.46 16.46 17.49 14.4 17.49 17.49 14.4 17.49 16.46 16.46 16.46 17.49 14.4 17.49 17.49 14.4 17.49 16.46 16.46 16.46 17.49 14.4 17.49

17.49 14.4 17.49 17.49 17.49 14.4 17.49 17.49 14.4 17.49 17.49 17.49 14.4 17.49 17.49 14.4 17.49 17.49 17.49 14.4 17.4917.49 14.4 14.4 14.4 17.49 17.49 14.4 14.4 14.4 17.49 17.49 14.4 14.4 14.4 17.49

17.49 17.49 17.49 17.49 17.49 17.49 17.49 17.49 17.49

17.49 17.49 17.49 17.49 17.49 17.49 17.49 17.49 17.4917.49 14.4 14.4 14.4 17.49 17.49 14.4 14.4 14.4 17.49 17.49 14.4 14.4 14.4 17.49

17.49 14.4 17.49 17.49 17.49 14.4 17.49 17.49 14.4 17.49 17.49 17.49 14.4 17.49 17.49 14.4 17.49 17.49 17.49 14.4 17.4917.49 14.4 17.49 16.46 16.46 16.46 17.49 14.4 17.49 17.49 14.4 17.49 16.46 16.46 16.46 17.49 14.4 17.49 17.49 14.4 17.49 16.46 16.46 16.46 17.49 14.4 17.4917.49 14.4 17.49 16.46 17.49 16.46 17.49 14.4 17.49 17.49 14.4 17.49 16.46 17.49 16.46 17.49 14.4 17.49 17.49 14.4 17.49 16.46 17.49 16.46 17.49 14.4 17.4917.49 14.4 17.49 16.46 16.46 16.46 17.49 14.4 17.49 17.49 14.4 17.49 16.46 16.46 16.46 17.49 14.4 17.49 17.49 14.4 17.49 16.46 16.46 16.46 17.49 14.4 17.49

17.49 14.4 17.49 17.49 17.49 14.4 17.49 17.49 14.4 17.49 17.49 17.49 14.4 17.49 17.49 14.4 17.49 17.49 17.49 14.4 17.4917.49 14.4 14.4 14.4 17.49 17.49 14.4 14.4 14.4 17.49 17.49 14.4 14.4 14.4 17.49

17.49 17.49 17.49 17.49 17.49 17.49 17.49 17.49 17.49

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 32nd Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

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Figure 166: Fuel assembly U235 enrichment per node for the 33rd core.

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

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2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

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2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 32nd Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

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Figure 167: Average burnable poison loading (grams) per node for the 34th core.

45.27 45.27 45.27 45.27 45.27 45.27 45.27 45.27 45.2745.27 14.4 14.4 14.4 45.27 45.27 14.4 14.4 14.4 45.27 45.27 14.4 14.4 14.4 45.27

45.27 14.4 45.27 45.27 45.27 14.4 45.27 45.27 14.4 45.27 45.27 45.27 14.4 45.27 45.27 14.4 45.27 45.27 45.27 14.4 45.2745.27 14.4 45.27 16.46 16.46 16.46 45.27 14.4 45.27 45.27 14.4 45.27 16.46 16.46 16.46 45.27 14.4 45.27 45.27 14.4 45.27 16.46 16.46 16.46 45.27 14.4 45.2745.27 14.4 45.27 16.46 45.27 16.46 45.27 14.4 45.27 45.27 14.4 45.27 16.46 45.27 16.46 45.27 14.4 45.27 45.27 14.4 45.27 16.46 45.27 16.46 45.27 14.4 45.2745.27 14.4 45.27 16.46 16.46 16.46 45.27 14.4 45.27 45.27 14.4 45.27 16.46 16.46 16.46 45.27 14.4 45.27 45.27 14.4 45.27 16.46 16.46 16.46 45.27 14.4 45.27

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45.27 45.27 45.27 45.27 45.27 45.27 45.27 45.27 45.27

45.27 45.27 45.27 45.27 45.27 45.27 45.27 45.27 45.2745.27 14.4 14.4 14.4 45.27 45.27 14.4 14.4 14.4 45.27 45.27 14.4 14.4 14.4 45.27

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45.27 45.27 45.27 45.27 45.27 45.27 45.27 45.27 45.27

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 15: 112-120 cm

Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Node 1: 0-8 cm

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Average Burnable Poison Loading (grams) per Node for 33rd Axial Core

Node 13: 96-104 cm Node 14: 104-112 cm

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Figure 168: Fuel assembly U235 enrichment per node for the 34th core.

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

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4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.954.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95 4.95

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.502.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.00 3.50 3.50 4.00 2.502.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50 2.50 4.00 3.50 3.00 3.50 3.00 3.50 4.00 2.50

2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.50 2.50 4.00 3.50 3.50 3.50 4.00 2.502.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50 2.50 4.00 4.00 4.00 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 2.50 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 3.50 3.00 2.50 3.00 2.50 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 3.50 3.00 3.00 3.00 3.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 3.50 3.50 3.50 2.50 2.50 3.50 3.50 3.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.502.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50

Node 22: 168-176 cm Node 23: 176-184 cm Node 24 and 25: 184-200 cm

Node 16: 120-128 cm Node 17: 128-136 cm Node 18: 136-144 cm

Node 19: 144-152 cm Node 20: 152-160 cm Node 21: 160-168 cm

Node 9: 64-72 cm

Node 10: 72-80 cm Node 11: 80-88 cm Node 12: 88-96 cm

Node 13: 96-104 cm Node 14: 104-112 cm Node 15: 112-120 cm

Fuel Assembly U235 Enrichment per Node for 33rd Axial CoreNode 1: 0-8 cm Node 2: 8-16 cm Node 3: 16-24 cm

Node 4: 24-32 cm Node 5: 32-40 cm Node 6: 40-48 cm

Node 7: 48-56 cm Node 8: 56-64 cm

Page 252: SBF in SMRs - MartJustinR2013