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U.S.NRCUNITED STATES NUCLEAR REGULATORY COMMISSION

Protecting People and the Environment

PUBLIC MEETING - DISCUSS ISSUES IDENTIFIED INTHE REVIEW OF U.S EPR LBLOCA AND FUEL

MECHANICAL TOPICAL REPORTS

July 9, 2009

N RC/N RO/DSRA/SRSB

1

I I

UNTDSTATES NUCLEAR REGULATORY COMMISSION

Ptcting People and the Environment

Purpose of the meeting:

For both topical report reviews, staff will informAREVA of concerns and positions regarding theremaining issues, provide technical bases anddiscuss the path forward

LBLOCA TR: ANP-10278P Rev.0 "U.S. EPR Realistic

Large Break Loss of Coolant Accident"

Fuel TR: ANP-10285P Rev.0 " U.S. EPR Fuel AssemblyMechanical Design Topical Report

2

U.S.NRCUNITED STATES NUCLEAR REGULATORY COMMISSION

Protecting People and the EnvironmentEPR SRSB Review Scope

Current Schedule: 9/30/09Review Results

1. Set Point TRSER Issued

2. RIA TR SERto be issued

shortly

1. Phase One Reviewcompleted

2. Phase Two Reviewon going with RAIsoutstanding

1. Phase One Reviewcompleted

2. Phase Two Reviewon going

3

Protn PLBLOCA TR Major Issues #1

Deficient Fuel Pellet Thermal Conductivity Model

RODEX3A based fuel pellet thermal conductivity

model does not take into account the exposure

dependent thermal conductivity degradation

Impact: 1. Hot rod and average rod initial stored

energy calculation

2. Rod heat transfer transient behavior

Staff Position: PCT penalty should be applied, if the

method is used without modification

4

U.S.NRCUNITED STATES NUCLEAR REGULATORY COMMISSION

Protecting People and the Enzironment LBLOCA TR Major Issues #2

Critical Flow Model Deficiency

S-RELAP5 code does not appropriately predict the

critical flow with the presence of non-condensablegases under certain conditions

Impact: Non-physical RCS pressurization prediction

for certain cases

Staff Position: Compensatory measure required, if the

method is used without modification

5

USNC LBLOCA TR Major Issues #3UNITED STATES NUCL.EAR REGULATORY COMMUSSION

Protecting People and the Environment

Lower Plenum Refill And Core Flow Oscillation

Staff is concerned that S-RELAP5 code predicts

significant core inlet liquid mass flux prior to the

lower plenum refill and significant large amplitude

core flow oscillation

Impact: Core quenching time and heat transfer above

the quench front

Staff Position: PCT penalty should be applied, if the

method is used without modification6

POther LBLOCA TR TechnicalIssues

Technical issues that have been discussed in the

course of the review:

Group 1 Issues - those which the staff and AREVAhave reached common understanding

Group 2 issues - those which the staff has takenpositions without reaching common understandingwith AREVA

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'zU.S.NRC LB LOCA TR Other TechnicalUNITED STATES NUCLEAR REGULATORY. COMMISSION

Protecting People and the Environment

Issues

Group 1:Initial power (Sampled -> rated+ uncertainty)Decay heat (Sampled -> nominal+uncertainty)Number of computer runs (59 -> 124)Loss of Offsite Power Analysis (not needed due toRCP automatic trip)Downcomer Boiling (Present treatment isacceptable)Lower bound of break spectrum (Present Treatmentis acceptable)Fuel Rod Quench (No quench unless both T<TminAND void<0.95)

8.

SU.S.NRTR

UNTDSTATES NUCLEAR REGULATORY COMMISSION I .~ ~ I ~I J~~Protecting Pe:opl adheEnionmen LBLOCA TR Other Technical

Issues

Group 2:Rod-to-Rod Radiation and core heat transfer

- Consistent with NRR staff position- Present treatment is still acceptable to EPR

because of low PCTForslund=Rohsenow Correlation

- Restriction appliesAccumulator Liquid temperature

- Insufficient justification of a temperature

distribution for hot full power operation, thetech. spec. maximum temperature should be

used 9

U.S.NRCUNITED STATES NUCLEAR REGULATORY COMMISSION

Protecting People and the Environment LBLOCA TR Path Forward

Current Approach:

Support current EPR DCD schedule, allow the method

to be used with limitations

Alternate Approach:

Issue SER with open items. AREVA proposes new

schedule to submit the revised topical report to

address issues

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U.S.NRC Fuel Mechanical Design TRUNITED STATES NUCLEAR REGULATORY COMMISSON

Proftecing Peopk anad th Environment I s e #Issue #1

Significant M5 assembly growth has been observed

Staff is concerned that the newly revised EPR fuelassembly growth model has not been validatedwith sufficient data and the stress history.uncertainty has not been defined

Impact: Fuel assembly burn-up limit

Path Forward:

AREVA has agreed to respond to new RAIs regarding

stress history uncertainty, data base size and growth

trend. A new review schedule has been established.

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'US.NRCUNITED STATES NUCLEAR REGULATORY COMMISSION

Protecting People and the Environment

Fuel Mechanical Design TRIssue #2

COPERNIC Code Cladding Strain Model

Staff is concerned that COPERNIC code has notbeen validated against the latest cladding strain

test data

Impact: Fuel rod maximum linear heat generation rate

for AQOs

Path Forward:

AREVA has agreed to respond to new RAIs regarding

the comparison of COPERNIC results with new-test

data12

U.S.NRCUNITED STATES NUCLEAR REGULATORY COMMISSION

Protecting People and the Environment Fuel TR Path Forward

New Schedule has been established with AREVA

Latest round of RAI responses due in August, 2009

Current SER delivery date 10/31/09

Assuming satisfactory RAI response from AREVA

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Status of Review of U.S. EPRTM Realistic Large BreakLOCA Topical Report and Fuel Assembly Mechanical

Design Topical Report

AREVA NP and Me NRCJu~y 9, 2009

TM EPR is a trademark of the AREVA Group EPR> NRC Meetina. RLBLOCA and FAM TR - July 9, 2009 1AREVA NP INC.

m .. ..... • J s

Introduction

Sandra M. SloanRegulatory Affairs Manager

New Plants

EPR2AREVA NP INC. > NRC Meeting, RLBLOCA and FAM TR - July 9, 2009

AREVA NP Meeting Objectives

> Obtain a complete list of open issues for the U.S.EPR Realistic Large Break LOCA Topical Reportand Fuel Assembly Mechanical Design TopicalReport

> Gain an understanding of the technical basis forNRC positions, particularly regarding proposed"compensatory measures"

> Provide AREVA NP perspective on NRC positions

Information provided will form the basis for an informeddecision regarding the path forward for the two reports.

EPRL > NRC Meeting, RLBLOCA and FAM TR - July 9, 2009 3

i AREVA NP INC. a

Background: RLBLOCA Topical Report

ANP-10278P submitted March 26, 2007

ANP-10278P accepted for review May 9, 2007

1st round RAIs issued July 20, 2007

Response to 1st round RAIs Aug.17, 2007

First scheduled DSER date (by letter dated May 9, Dec. 31,20072007)

2nd round RAIs issued May 15, 2008

Response to 2nd round RAIs June 13, 2008

Phone call: NRC states DSER being prepared, but July 10, 2008open issues remain with 2nd round RAIs; Optionsgiven: 1) DSER with statement that certain parts ofmethodology are unacceptable; 2) PCT penalty > 500'F; 3) 3rd round RAIs

EPRi AREVA NP INC. L > NRC Meeting, RLBLOCA and FAM TR - July 9, 2009 4

Background: RLBLOCA Topical Report

Second scheduled DSER date (by letter dated March July 15, 200826, 2008)

Meeting to identify all open items and discuss path July 25, 2008forward

NRC-AREVA NP face-to-face management Aug. 6, 2008discussion: AREVA NP accepts 3rd round RAIs aspath forward. No new issues; apply "transitionapproach ."

3rd round RAls issued Sept. 5, 2008

Meeting to describe AREVA NP strategy to address Sept. 10, 20083rd round RAIs

NRC Audit.- RODEX2 and RODEX3A Dec. 3-4, 2008

First set of responses to 3rd round RAIs Dec. 19, 2008

4th round RAIs issued Jan. 28, 200•.

L EPRAREVA NP INC. / > NRC Meeting, RLBLOCA and FAM TR - July 9, 2009 5

Background: RLBLOCA Topical Report

5th round RAIs issued March 11, 2009

Second set of responses to 3rd round RAIs March 31, 2009

Response to 4th round RAts April 2, 2009

Response to 5th round RAIs April 9 2009

NRC audit April 22-23, 2009

Draft 6th round RAIs received May 21, 2009

Status meeting July 9, 2009

Third scheduled DSER date (by letter dated March Sept. 16, 200919, 2009)

Fourth scheduled DSER date (by letter dated June Sept. 30, 200925, 2009)

EPRAREVA NP INC.. > NRC Meeting, RLBLOCA and FAM TR - July 9, 2009 6

Cumulative PCT Impact of ProposedChanges and Compensatory Measures

> U.S. EPR FSAR Rev. 0 LBLOCA PCT, 1512 OF

Item APCT

Fuel rod model (RODEX). 200 OF

Flow and lower plenum 100 OFrefill

Decay heat 200 OF

124 cases (was 59) 100 OF

TOTAL --600 OF

EPRAREVA NP INC. > NRC Meeting, RLBLOCA and FAM TR - July 9, 2009 7

Background: Fuel AssemblyMechanical Design Topical Report

ANP-10285P submitted October 2, 2007

ANP-10285P accepted for review Dec. 7, 2007

First round RAI issued April 30, 2008

First set of responses to round 1 RAI May 29, 2008

Second set of response to round 1 RAI June 13, 2008

Second round RAI issued June 24, 2008

Response to second round RAI July 24, 2008

First scheduled DSER date (by letter dated August 21, 2008December 7, 2007)

Audit (2 days) Dec. 3-4, 2008

EPRAREVA NP INC > NRC Meeting, RLBLOCA and FAM TR - July 9, 2009 8

Background: Fuel AssemblyMechanical Design Topical Report

Third round RAI issued Jan. 15, 2009

First set of responses round 3 RAI April 2, 2009

Audit (2 days) April 23-24, 2009

Revision to round 3 RAI 38 April 30, 2009

Fourth round RAI issued June 26, 2009

Planned response to fourth round RAI August 14, 2009

Current DSER schedule Oct. 31,2009

EPRmRV PIC> NRC Meeting, RLBLOCA and FAM TR - July 9, 2009 9

AREVA NP Next Steps

> Evaluate information received regardingremaining open issues and technical basis forcompensatory measures

Consider in a broad context, including- effect ofpreviously-identified methodology changes and impacton overall DC review schedule

> Notify NRC of response to stated positions,especially regarding proposed compensatorymeasures

EPR_> NRC Meeting, RLBLOCA and FAM TR - July 9, 2009 10AREVA NP INC.