ML20236X586

Summary of 980620 Meeting W/Members of W,Util & NRC in Rockville,Md Re best-estimate Small Break LOCA Model Issues. Attendees List & Nonproprietary Matl Presented at Meeting Encl

ML20236X586
Person / Time
Site:	Indian Point
Issue date:	08/05/1998
From:	Wen P NRC (Affiliation Not Assigned)
To:	Essig T NRC (Affiliation Not Assigned)
References
RTR-REGGD-1.157 NUDOCS 9808100121
Download: ML20236X586 (11)

Text

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NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 2006& 4001

\ *****/ August 5, 1998 MEMORANDUM TO: Thomas H. Essig, Acting Chief Generic issues and Environmental Projects Branch Division of Reactor Program Management Office of Nuclear Reactor Regulation

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FROM: Peter C. Wen, Project Manager Generic Issues and Environmental Projects Branch fd C INA Division of Reactor Program Management Office of Nuclear Reactor Regulation

SUMMARY

OF JULY 20,1998, MEETING WITH WESTINGHOUSE REGARDING BEST-ESTIMATE SMALL BREAK LOCA MODEL ISSUES On June 20,1998, a public meeting was held at the U.S. Nuclear Regulatory Commission's (NRC's) offices in Rockville, Maryland, between members of Westinghouse, utility, and NRC staff. Attachment i lists attendees at the meeting. Attachment 2 is a copy of the non-proprietary material presented at the meeting.

The meeting started with a presentation by a Westinghouse representative of the meeting agenda and current loss-of-coolant accident (LOCA) model development activities within Westinghouse. Some of these activities include the program of developing the best-estimate small break LOCA model. This program is a joint partnership between Westinghouse / Consolidated Edison Company and Electric Power Research Institute. The lead plant to apply this methodology is Indian Point Unit 2.

Next, an utility representative presented the utility point of view. He stated that Con Edison was taking a lead role in the industry by having completed the best-estimate large break LOCA analysis project and initiating the best-estimate small break LOCA analysis project in response to the new 10 CFR 50.46 and Reg Guide 1.157. He emphasized that by using the best-estimate model they saw a real benefit in improving safety. He stated that this is achieved through better understanding of the transients, focusing on the real safety issues, and demonstrating more margins to the safety limits. He said that the increased flexibility in g operations would lead to better operator training and more flexible and safe operations. Also l through higher peaking factors, vessel fluence could be reduced. He also pointed out that the l best-estimate model could be a cost-beneficiallicensing action because of the significant saving \

through fuel management improvements, reduced reactor trips, and potential power uprating P and life extension.

p' b b Finally, another Westinghouse representative presented the overall technical approach of the best-estimate small break LOCA model. This portion of the presentation was involved in discussion on Westinghouse proprietary information.

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T. Essig August 5, 1998 l

Major discussion points regarding the schedule for submitting the topical reports for NRC staff

! review and the format of the submittal are as follows:

l Westinghouse plans to submit the related topical reports in late 1998, and requested the staff to begin a review in early 1999. The approved methodology will then be used in the Indian Point Unit 2's reload safety analysis in 2001-2002 time frame.

l The staff emphasized the importance of following the code scaling, applicability and l uncertainty (CSAU) approach and providing documentation which is complete, comprehensive, and well formatted. The document is expected to be well indexed with a road map and comparison against the CSAU approach up-front. The staff stated that it would perform an acceptance review of the documentation to assure that these characteristics are evident.

. The staff indicated that there are no funds budgeted for contractor support; thus, the submitted topical reports' review would have to be performed in-house on a schedule i consistent with the staff's workload.

The representatives of the NRC, Westinghouse, and utility agreed that this meeting was useful in accelerating the information exchange.

L l Attachments: As stated cc w/atts: See next page l

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T. Essig -2 August 5, 1998 Major discussion points regarding the schedule for submitting the topical reports for NRC staff review and the format of the submittal are as follows:

Westinghouse plans to submit the related topical reports in late 1998, and requested the staff to begin a review in early 1999. The approved methodology will then be used in the Indian Point Unit 2's reload safety analysis in 2001-2002 time frame.

The staff emphasized the importance of following the code scaling, applicability and uncertainty (CSAU) approach and providing documentation which is complete, comprehensive, and well formatted. The document is expected to be well indexed with a road map and comparison against the CSAU approach up-front. The staff stcted that it would perform an acceptance review of the documentation to assure that these characteristics are evident.

The staff indicated that there are no funds budgeted for contractor support; thus, the submitted topical reports' review would have to be performed ir'-house on a schedule consistent with the staff's workload.

The representatives of the NRC, Westinghouse, and utility agreed that this meeting was useful in accelerating the information exchange.

Attachments: As stated cc w/atts: See next page DISTRIBUTION: See attached page

• See Previous Concurrence Dr.cument Name: g:\pxw\msum0720.wst OFFICE PM:PGEB:DRPM SC:SRXB SC:PGEffffvt, NAME PWen:sw M EWeiss* FAkstulewb DATE 8/5 /98 8/ 5 /98 8d/98 OFFICIAL OFFICE COPY

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• l NRC/ WESTINGHOUSE MEETING ON BEST-ESTIMATE SBLOCA MODEL ISSUES LIST OF ATTENDEES l

July 20,1998 I

NAME ORGANIZATION Eric Weiss NRR/SRXB Ralph Caruso NRR/SRXB Frank Orr NRR/SRXB l Joseph Staudenmeier NRR/SRXB Ralph Landry NRR/SRXB Jefferey Harold NRR/DRPE Peter Wen NRR/PGEB Arthor Ginsberg Consolidated Edison Co.

Jeffrey Bass Westinghouse L Steve Bajorek Westinghouse i

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Attachment 1

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1 Westinghouse / Con Edison / EPRI l Best Estimate Small Break LOCA Methodology Development Program J. C. Bass Manager, LOCA Integrated Services Westinghouse Electric Co.

(412) 374-4262 July 20,1998 l

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l NRC..MTG_SB_BELOCA Ira

AGENDA I. Introduction (S. Ira) a) Introduction to Overall Plan and Objectives

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II. Industry Needs and Benefits (A. Ginsberg) a) Utility Perspective b) Technical Henefits III. Technical Approach (S. M. Bajorek) a) CSAU Approach Applied to SBLOCA b) Small Break PIRT c) Code Revisions and V&V for BE-SBLOCA d) PWR Calculations / Scoping Study Results e) Statistical Methodology 0 Current Issues IV. Proposed Schedule for Submittals/ Review (S. M. Bajorek) ,

V. Discussion (All) 4 NRC_hfrG_SB_BELOCA_ Ira

INTRODUCTION WESTINGHOUSE IS COMMITTED TO THE DEVELOPMENT OF STATE-OF-THE-ART METHODOLOGIES FOR LOSS OF COOLANT LOCA ANAYSIS

> CONTINUED DEVELOPMENT INSURES:

>> SAFETY

>> COST EFFECTIVE OPERATION

>> ABILITY TO UNDERSTAND NEW & EVOLVING ISSUES

> LONG TERM LOCA DEVELOPMENT PLAN HAS INCLUDED:

>> APPENDIX K MODEL IMPROVEMENTS

>> INTERIM "SECY" METHODOLOGY FOR 2-LOOP UPI PWRS

>> BEST ESTIMATE LARGE BREAK LOCA l l

>> AP600 BELOCA ANALYSIS

> OUR INTENTION IS TO CONTINUE ADVANCED T/H CODE DEVEL-l OPMENT TO MEET CUSTOMER AND REGULATORY NEEDS l

> BEST ESTIMATE SMALL BREAK LOCA IS THE NEXT STEP NRC_MTG_SB_BELOCA_ Ira

BEST ESTIMATE SMALL BREAK LOCA PROGRAM JOINT PARTNERSHIP BETWEEN WESTINGHOUSE / CON EDISON (

AND EPRI

> LEAD PLANT IS INDIAN POINT UNIT 2 i

PROGRAM MAJOR OBJECTIVES

> DEVELOP AND LICENSE A BEST ESTIMATE SMALL BREAK METHODOLOGY GENERICALLY APPLICABLE TO CONVEN-TIONAL WESTINGHOUSE 3 and 4 LOOP PWRS.

> PERFORM A PLANT SPECIFIC APPLICATION FOR INDIAN POINT UNIT 2. l J

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NRC_MTG_SB_BELOCA_ Ira t

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.o OHJECTIVES FOR TODAY'S MEETING l

1. DEMONSTRATE THAT THE FEASIBILITY OF CSAU TYPE OF l-METHODOLOGY FOR BEST ESTIMATE SMALL BREAK ANALYSIS &

SHOW THAT WESTINGHOUSE CAN AND WILL FORMAT THE METH-ODOLOGY TO ACCOMODATE AN EFFICIENT REVIEW.

2. IDENTIFY & DISCUSS ANY MAJOR ISSUES l

3. PROPOSE A REVIEW SCHEDULE l'

t NRC_MTG_SB_BELOCA_ Ira

s cc:

Mr. Nicholas Liparulo, Manager Equipment Design and Regulatory Engineering Westinghouse Electric Corporation Mail Stop ECE 4-15 P.O. Box 355 Pittsburgh, PA 15230-0355 Mr. Jack Bastin, Director Regulatory Affairs Westinghouse Electric Corporation 11921 Rockville Pike Suite 107 Rockville, MD 20852 Mr. Hank Sepp, Manager Regulatory and Licensing Engineering Westinghouse Electric Corporation PO Box 355 Pittsburgh, PA 15230-0355 Mr. Steve Bajorek Westinghouse Electric Corporation PO Box 355 Pittsburgh, PA 15230-0355 4

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s Distribution: Mtg. Summary w/ Westinghouse Re Best-Estimate SBLOCA Model Issues Dated 8]5/9d Hard Cooy Docket File '

PUBLIC PGEB R/F-OGC ACRS PWen Eric Weiss Ralph Caruso Frank Orr Joseph 4taudenmeier Ralph Landry .

Jefferey Harold EMail SCollins/FMiraglia BSheron RZimmerman BBoger JRoe DMatthews TEssig FAkstulewicz TCollins GHolahan SNewberry GTracey, EDO I i

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