CHF Correlations for GAlA Fuel Assembly - nrc.gov · CHF Correlations for GAlA Fuel Assembly - Steven Lydzinski - May 28, 2015 2 AR EVA. Agenda ... lp Objective and Schedule Oo GAlA

CHF Correlations for GAlAFuel AssemblyPre-submittal Tactical Meeting

AREVA/NRC MeetingRockville, MDMay 28, 2015

Steven LydzinskiManagerUS PWR Fuels, Thermal-HydraulicsAREVA Inc. A

AREVA

Acronyms

> CFD - Computational Fluid Dynamics

0> CHF - Critical Heat Flux

K> DNB - Departure from Nucleate Boiling

0 EOHL - End of Heated Length

K> GAlA - AREVA's advanced fuel assembly design for PWR reactors

0, GT - Guide Tube

0 HMP - High Mechanical Performance

< HTP - High Thermal Performance

C> IFM - Intermediate Flow Mixer

I IGM - Intermediate GAlA Mixer

÷ KATHY - KArlstein Thermal-HYdraulic test facility

0 MDNBR - Minimum Departure from Nucleate Boiling Ratio

0 ORFEO - Advanced CHF correlation form

ACHF Correlations for GAlA Fuel Assembly - Steven Lydzinski - May 28, 2015 2 AR EVA

Agenda

Oo Objective and Schedule

Oo GAlA Fuel Assembly Design

0o KATHY CHF Testing Facility

Oo CHF Testing Program for GAlA

Po CHF Correlations for GAlA

lo Topical Report Content

lo Summary and Discussions


Agenda

lp Objective and Schedule




Oo CHF Correlations for GAlA

Oo Topical Report Content

Oo Summary and Discussions


Objective

loTo discuss the [ ] Topical Report submittalfor two CHF correlations applicable to GAlA fuelassembly design

* CHF correlation based on the mixing (vaned) grid tests(GALA structural grid and IGM grid)

K CHF correlation based on the non-mixing (vaneless) gridtests (including HMP grid)

OoAs previously discussed with NRC, there will beone Topical Report submittal that will include bothCHF correlations


Schedule

0. Pre-submittal tactical meeting (strategy and scope) - May2015

Oo Pre-submittal meeting (content)- [

Oo Topical Report submittal to NRC -

II

Il Post-submittal meeting - [ I!o Additional meetings/technical audits as needed

NRC approval is requested by [ IA

CHF Correlations for GAlA Fuel Assembly - Steven Lydzinski - May 28, 2015 6 AREVA

The Review Has Already Started ...

Oo NRC staff members visited AREVA's KATHY testfacility in Karlstein, Germany to observe a GAlACHF test in March 2015


Agenda

lo Objective and Schedule

Po GAlA Fuel Assembly Design

Ol KATHY CHF Testing Facility

lo CHF Testing Program for GAlA

lo CHF Correlations for GAlA


No Summary and Discussions


GAlA Fuel Assembly DesignGeometry

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GAlA Fuel Assembly DesignSpacer Grids

ACHF Correlations for GAlA Fuel Assembly - Steven Lydzinski - May 28, 2015 loAREVA

GAlA Fuel Assembly DesignSpacer Grids-

AAssembly - Steven Lydzinski - May 28, 2015 11 AR EVACHF Correlations for GAlA Fuels


ACHF Correlations for GAlA Fuel Assembly - Steven Lydzinski - May 28, 2015 12AREVA

GAlA Fuel Assembly DesignSpacer Grids U

ACHF Correlations for GAlA Fuel Assembly - Steven Lydzinski - May 28, 2015 13AREVA


AFuel Assembly - Steven Lydzinski - May 28, 2015 14 AR EVACHF Correlations for GAlA


AAssembly - Steven Lydzinski - May 28, 2015 15 AR EVACHF Correlations for GAlA Fuel,


AAssembly - Steven Lydzinski - May 28, 2015 16 AR EVACHF Correlations for GAlA Fuel

Agenda

lo Objective and Schedule


Po KATHY CHF Testing Facility

lo CHF Testing Program for GAlA





KATHY CHF Testing FacilityDescription

Po KArlstein Thermal-HYdraulictest facility operated byAREVA

Io Used for research,development and licensing ofPWR and BWR nuclear fuelassemblies

Oo Facility start-up: 1986Io Extended qualification in 2002

and 2003 for PWRmeasurements

Oo More than 80 PWR DNB tests

High pressure ..Coolers

5w

<9,M p<18 bar

Moretests

than 140 BWR dryout

CHF Correlations for GAlA Fuel Assembly - Steven Lydzinski - May 28, 2015A

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KATHY CHF Testing FacilityQualification

Oo The GAlA measured CHF performance is obtainedfrom a qualified test facility

K> KATHY was qualified during the ACH-2 CHF correlation reviewprocess by performing a comparison against ColumbiaUniversity's HTRF

K> The ACH-2 CHF correlation (for the US EPR fuel design)approved by NRC in 2007 (ANP-10269P-A) was the first US PWRapplication based on CHF test data collected in KATHY

K> Benchmarked to OMEGA loop (France)

The AREVA's sole source of new CHF measurements for thepast 10 years


Compliance with RegulatoryRequirements

Oo The CHF testing performed in the KATHY loopcomplies with the regulatory requirements of 10CFR 50 Appendix B (Quality Assurance Criteria forNuclear Power Plants and Fuel ReprocessingPlants)

lo The CHF correlations applicable to GAlA fuelassembly comply with the requirements ofNUREG-0800 (Standard Review Plan) Sections 4.2and 4.4


Agenda

Ol Objective and Schedule






lo Summary and Discussions

ACHF Correlations for GAlA Fuel Assembly - Steven Lydzinski- May 28, 2015 21 AR EVA

CHF Testing Program for GAIATest Basis

lo Mixing grid (GALA, IGM)

< Over [ ] CHF tests representative of a 17x17 geometry havebeen performed during the development and characterizationof the GAlA grid

* The majority are associated with the interstitial grid design> Multiple grid variants and sub-variants have been tested to

isolate desired CHF results

K After the GAlA structural grid and the IGM grid designs wereset, the licensing CHF tests were performed


CHF Testing Program for GAlATest Assembly Configurations

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CHF Testing Program for GAlATest Basis and Assy. Configuration

0-Non-mixing gridF Database includes CHF test data collected for

K Database includes CHF test data collected in the following testloops

" ARC (Alliance Research Center, USA)" HTRF (Columbia University, USA)" OMEGA (France)

" KATHY (Germany)

" EURATOM (Italy)


CHF Testing Program for GAlAData Collection Ranges

AIA Fuel Assembly - Steven Lydzinski - May 28, 2015 25 AR EVACHF Correlations for GA

CHF Testing Program for GAlAData Collection Ranges

AIA Fuel Assembly - Steven Lydzinski - May 28, 2015 26 A R EVACHF Correlations for GA

Agenda

Po Objective and Schedule

Po GAlA Fuel Assembly Design


Oo GAlA CHF Testing Program





CHF Correlations for GAlAFunctional form

OP Development of an advanced correlation form(ORFEO) started in 2006

Oo ORFEO utilizes a modular approach, consisting of<> A general representation term (PGX) based on multiple grid

designs,

K A specific adjustment term based on a specific grid design, and

K> A correction factor to account for non-uniform axial powerprofiles

OP-ORFEO form is used for both CHF correlationsapplicable to GAlA fuel assembly

* CHF correlation based on the mixing grid tests

K CHF correlation based on the non-mixing grid tests

ACHF Correlations for GAlA Fuel Assembly - Steven Lydzinski- May 28, 2015 28 AR EVA

CHF Correlations for GAlA jFunctional form I

Io ORFEO - an advanced CHF correlation form that separatesthe general representation parameters from the specific griddesign parameters

Commonalityof grid

designs

q crit = iI

I

3CFdata

(Spacer griddesign 1)

CHF data(NEW spacergrid design)/

Uniquenessof a specificgrid design

-M

P: pressure, G: mass flux, X: quality, gsp: grid spacing, dg: dist. from upstream grid,rtg: guide tube factor, FNUL: non-uniform factor

CHF Correlations for GAlA Fuel Assembly - Steven Lydzinski - May 28, 201529A EVA

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CHF Correlations for GAIADatabases U


CHF Correlations for GAlACharacteristics

O-ORFEO CHF correlation

Utilizes physical elements within empirical correlation

Adequately describes the influence of axial power shapes

Is based on a CHF test suite that characterizes the effect ofphysical parameters used in the correlation form

Incorporates basic dependencies adapted from mechanisticapproach to DNB

Incorporates a "burnout length" term (comparable to boilinglength used in some BWR dryout correlations) - reduces theMeasured over Predicted CHF variability at high qualities

Minimizes the risk of overpredicting untested conditions (byacquiring high quality/high pressure data)


CHF Correlations for GAlABurnout length

Po Models the transition between DNB (linear form)and dryout (exponential form) via a smoothfunction for a large range of qualities

takes into account the axialheat flux impact on the local ×/quality q Transition DNB /Dryoutis similar to the "boiling E Location

length" used in some BWR /

dryout correlations BurnoutWJ length

Elevation Z

Similarity in terms of modeling the boiling phenomenonbetween the PWR and BWR correlations


CHF Correlations for GAlABurnout length

lo-Application of the "burnout length" parameterleads to significantly reduced Measured toPredicted (M/P) variability

Standard Empirical PWR CHF Correlation

0

0 ý

1.4

1.3

1.2

1.1

1.0

0.9

0.8

0.7

0.6

00°I-

I..

1.;

1.1

1.i

0.0.1

0.

AREVA Advanced Correlation Form at Extended Range

4

3

2

¶~~g TA S.**" ~

• q *

0

7

-0.1 0.0 0.1 0.2 0.3 OA 0.5 0.6Equilibrium Quality X

-0.1 0,0 0.1 0.2 0.3

Equilibrium Quality X0.4 0.5 0.6

The benefit of the reduced MIP variability even continuesinto the higher quality region


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CHF Correlations for GAlAEffectiveness

lo The effectiveness of theORFEO CHF correlationform is shown for threetypes of grid designs

Excellent fit for differentaxial power shapes and gridtypes

0

a.

1.4

1.3

1.2

1.1

1.0-

0.9

0.8

0.7

0.6-0.2 -0.1 0.0 0.1 0.2 0.3 0.4 0.5 0.6

Equilibrium Quality X

1.008 0.060 :0-

I .

1.3

1.2

1.1

1.0

0.9

0,8

0.7

0.6

GAIA design(uniform and non-uniform)

AFA2G andAFA 3G

All

24 2158

46 40401.005 0.061

0.2 -0,1 0.0 0.1 0.2

Equilibrium Quality X0.3 0.4 0.5 0.6


34 AR EVA

CHF Correlations for GAlARegions of application

111

]

A35 AR EVACHF Correlations for GAlA Fuel Assembly - Steven Lydzinski - May 28, 2015

CHF Correlations for GAlASubchannel Code

Oo COBRA-FLX is the AREVA's advanced methodssubchannel thermal-hydraulic analysis code

÷ Approved by NRC for stand-alone application to nuclear corethermal-hydraulic analysis for steady-state and transientconditions in ANP-10311 P-A

Oo-GAIA CHF correlation will be developed usingCOBRA-FLX and the empirical correlations,numerical solution methods, etc. approved byNRC in the SER issued for the COBRA-FLX TopicalReport

ACHF Correlations for GAlA Fuel Assembly - Steven Lydzinski - May 28, 2015 36 A R EVMA

Agenda



lo KATHY CHF Testing Facility


lo CHF Correlations for GAlA




CHF Correlations for GAlATopical Report Content (1)

lo Introduction0, Purpose of the report

0 Intended application of the CHF correlations

K Need for new CHF correlations

OoCompliance with regulatory requirements - SRPSections 4.2 and 4.4

Oo-CHF testing facility<> Description and qualification

0> Test procedures and data collection methods

0- Test reproducibility



O.CHF testing program" Test assembly configurations

K> Data collection ranges

Oo Generic ORFEO CHF correlation form0 Correlation functional form

K> Data evaluation and optimization of coefficients

Oo Development of ORFEO CHF correlation based onthe mixing grid tests (GALA, IGM)

0 Specific adjustments to the correlation form

0 Subchannel code model

K> Data evaluation and optimization of coefficients



OP Development of ORFEO CHF correlation based onthe non-mixing grid tests

0> Specific adjustments to the correlation form

<"> Subchannel code model

0 Data evaluation and optimization of coefficients

lo-Statistical analysis of CHF correlationK Statistical evaluation of Measured over Predicted (M/P) data

points for mixing grid tests* Development data set and validation data set

*> Statistical evaluation of M/P data points for non-mixing gridtests

* Development data set and validation data set



Pl Correlation application(>Application range and design limit

" Mixing grid correlation

" Non-mixing grid correlation

Oo Correlation behavior with respect to independentvariables of pressure, mass flux and quality

0o Conclusions and summary"> Capability of the CHF correlations

K> Ranges of applicability

0> Overall statistics

0 Comparison to experimental test data

ACHF Correlations for GAlA Fuel Assembly - Steven Lydzinski- May 28, 2015 41 AREVA


ARnbly - Steven Lydzinski - May 28, 2015 42 A REVACHF Correlations for GAlA Fuel Assen


ARnbly - Steven Lydzinski - May 28, 2015 43 A R IEVACHF Correlations for GAlA Fuel Assen


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Agenda


0o GAlA Fuel Assembly Design







CHF Correlations for GAlASummary and Discussions

Anbly - Steven Lydzinski - May 28, 2015 46 AR EVACHF Correlations for GAlA Fuel Assem

CHF Correlations for GAlA

Questions / comments / feedback

Arrelations for GAlA Fuel Assembly - Steven Lydzinski - May 28, 2015 47 AR EVACHF Cor

Documents

CHF Correlations for GAlA Fuel Assembly - nrc.gov · CHF Correlations for GAlA Fuel Assembly - Steven Lydzinski - May 28, 2015 2 AR EVA. Agenda ... lp Objective and Schedule Oo GAlA