ML20235W838

Summary of 870910 Meeting W/Idcor Steering Committee Re Status of Generic Ltr to Initiate Ipes,Idcor IPE Methods, Remaining Technical Issues,Acrs Comments & Proposed Trial Review & Severe Accident Mgt Programs.Agenda Encl

ML20235W838
Person / Time
Issue date:	10/14/1987
From:	Eltawila F NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES)
To:	Sheron B NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES)
References
NUDOCS 8710190053
Download: ML20235W838 (15)

Text

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. l OCT 141987 1

MEMORANDUM FOR: Brian W. Sheron, Director Division of Reactor and Plant Systems Office of Nuclear Regulatory Research THRU: Franklin D. Coffman, Acting Chief Reliability and Human Factors Branch l

Farouk Eltawila FROM: ,

Reliability Assessment Section

Reliability and Human Factors Branch

SUBJECT:

MINUTES OF THE NRC/IDCOR STEERING COMMITTEE MEETING ON SEPTEMBER 10, 1987 The purpose of the meeting was to discuss (1) the status of the generic letter to initiate the IPEs (2) the IDCOR IPE methods remaining technical issues, (3) the ACRS Comments and proposed trial review, (4) sever.eaccident management programs and (5) examination of plants against severe accidents initiated by external events. A copy of the agenda, list of attendees, and handouts are attached.

Mr. Cordell Reed, chairman of the IDCOR steering Committee announced the plans that, after issuance of the generic letter or January 1,1988, his comittee would tenninate its activities and NUMARC would take over the severe accident activities with a NUMARC staff member designated as the industry contact with the staff. ,

Dr. Brian Sheron stated that the NRC objectives of the IPE are for the utilities to identify plant features (hardware, training or maintenance) that can improve plant perfonnance and to implement them to reduce the frequency of severe accident and mitigate the consequence should one occur. The guidelines and criteria that will be attached to the generic letter will present an assimilation of insights gained from previous systematic examinations.

Dr. Sheron also stated that the staff is preparing, as an appendix to the generic letter, a document to provide guidance on the examination of containment systems performance given the present state of the art of analysis of phenomena in the containment during and after core melting accident.

Dr. Sheron, then presented the current schedule for the implementation of the severe accident policy. Upon issuance of the generic letter in December 1987, utilities will have 120 days to respond on what method they intend to use and the schedule for submitting their assessments. The implementation program of the Commission Severe Accident Policy is expected to be completed by the end of 1990. The utilities will submit the results of the IPEs identifying the plant vulnerabilities and their plans to dispose of these vulnerabilities. It is expected that utilities would proceed to implement the simple fixes immediately.

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-2 With regard to the IDCOR IPEM, Mr. C. Reed indicated that they thought that

'- all issues'related to the IPEM were closed. However, the staff stated that some concerns remain. A meeting is tentatively scheduled for October 1987. The staff will prepare a list of the remaining concerns including these related to the use of the MAAP Code and. send it to IDCOR prior to the meeting.

Concerning 'the trial reviews recommended by the ACRS, B. Sheron indicated that al.though there are benefits to be gained from such reviews, it would delay the initiation of the IPE by at least one year. He stated that since the staff is preparing more detailed guidance on how to do the containment perfonnance assessment, and since;the staff is planning to hold regional works shops to answer utility questions, trial reviews are not need'e'd. C. Reed concurred with the staff position.

Dr. Sheron introduced the subject of accident management programs and indicated that it is not intended as a new program but simply utilize the insights gained from performing the IPE. The program will help each utility understand what could probably go wrong _in the plant and put in place a procedure to deal with it. The program will encompass a delineation of responsibilities, determination of equipment capabilities, identification of actions, instruction and training.

C. Reed stated that he will discuss the accident management issue with the appropriate people in the industry and would call for a meeting to discuss this issue further.

The last item on the agenda was devoted to the treatment of external events in the IPE process. Dr. Sheron stated that the Commission Policy on severe accidents did not distinguish between internally or externally initiated events that'could lead to a severe accident. Dr. Sheron also stated that the position presented by IDCOR at the external event work shop is not substantiated and some reasonable justifications are needed for why some external events are being excluded. C. Reed agreed to discuss the external event issue with industry people and he will address IDCOR position in the future meeting with NRC.

At the end of the meeting Dr. Sheron indicated that the Comission will issue in November 1987, a severe accident report that assimilates the infonnation in NRC's possession on the subject. This report will be updated on a regular basis to provide current information to the industry.

S Farouk Eltawila Reliability Assessment Section Reliability and Human Factors Branch

Attachment:

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TENTATIVE AGENDA I - ^ NRC/IDCOR Senior'Hanagement

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~a Introductory Remarks Reed /Murley/Beckjord~

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L t' o : Generic Letter Issues B. Sheron/J.: Raulston

- . Schedule Concerns / Remaining' Process l'

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.- IPE Methodology Issues

- 'ACRS Comments / Trial.Uses MAAP.Use'in IPE'

' 'o - NRC Review of MAAP for Use.0ther than IPE

. Application. C. Reed /E.:Beckjord w

o: IDCOR/NUMARC: Participation in' Future

. Discussion of' Severe Accident' Issues /Research .C. Reed /E..Beckjord-t.

-- Severe Accident Management Issues l~i , ,

o. External Events W.:Rasin/B. Sheron'

/- Workshop Impressions

'-: Industry Positions-

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o  : Future Interactions / Wrap-up C. Reed /T. Hurley

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NOTES FOR DISCUSSION AT NRC/IDCOR' SENIOR MANAGEMENT MEETING SEPTEMBER 10, 1987 B. SHERON 1, .IPEs-o PROPOSED. GENERIC LETTER.

s i o SEVERE ACCIDENT MANAGEMENT o ACRS COMMENTS / TRIAL REVIEWS o SCHEDULE o REMAINING METHODS ISSUES f

11. CONSIDERATION OF EXTERNAL HAZARDS 1

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INDIVIDUAL PLANT-EXAMINATIONS (IPEs)

I LOBJECTIVES AND' SCOPE l- o A SYSTEMATIC EXAMINATION OF PLANT DESIGN AND OPERATIONS FOR 1

l 'BOTH INTERNALLY AND EXTERNALLY INITIATED SEVERE ACCIDENTS (PERFORMED USING IDOCR's IPE METHODOLOGY OR A MODERN PRA).

3 o IDENTIFY PLANT-SPECIFIC VULNERABILITIES

• FOR BOTH ,

I CORE DAMAGE AND CONTAINMENT PERFORMANCE, l$ o UNDERSTAND WHAT COULD POSSIBLY G0 WRONG IN A PLANT, l 0 IDENTIFY AND EVALUATE MEANS FOR IMPROVING PLANT / CONTAINMENT PERFORMANCE (VIA HARDWARE ADDITIONS / MODIFICATIONS, l{

ADDITIONS TO PROCEDURES, TRAINING); INCORPORATE INTO SEVERE i is ACCIDENT MANAGEMENT PROGRAM, 1

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LEADING SEVERE ACCIDENT CONTRIBUTORS FOR THE PLANT 4

PROPOSEu e6NERIC LETTER

o. PURPOSE TO INITIATE THE IPEs.

o SPECIFIES.3-OPTIONS FOR THE SYSTEMATIC EXAMINATION:

IDCOR IPEM AS' APPROVED LEVEL-II GR LEVEL-III PRA OTHER METHODS o GUIDES SELECTION OF POTENTIALLY IMPORTANT CONTRIBUTORS TO SEVERE ACCIDENTS (APPENDIX) o SUPPLIES INSIGHTS THROUGH GUIDELINES AND CRITERIA GUIDELINES IDENTIFY PLANT FEATURES PREVIOUSLY FOUND TO BE IMPORTANT CRITERIA MEASURE PERFORMANCE OF PLANT FEATURES

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APPROPRIATE FOR SEVERE ACCIDENTS o DEFINES DOCUMENTATION NEEDED FOR SUBMITTAL TO NRC AND RETENTION BY UTILITY o DESCRIBES SEVERE ACCIDENT MANAGEMENT AND ITS ROLE (APPENDIX) o EXPLAINS THE RELATIONSHIP BETWEEN THE IPE AND USIs/GSIs o PROVIDES GUIDANCE ON THE EXAMINATION OF CONTAINMENT PERFORMANCE (APPENDIX) o IDENTIFIES THE REGULATORY BASIS AND REQUESTS AND INITIAL RESPONSE WITHIN 120 DAYS,

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SEVERE ACCIDENT MANAGEMENT o PURPOSE: TO ASSURE THAT THE IPE INSIGHTS ARE ASSIMILATED INTO THE DESIGN AND OPERATIONS OF THE PLANT AND TO ASSURE THAT EACH OPERATING PLANT HAS A PROGRAM IN PLACE THAT PROVIDES A THOUGHT-00T, STRUCTURED PLAN OF RESPONSE TO SEVERE ACCIDENTS o APPROACH: DETERMINE THE MOST EFFECTIVE MITIGATION STRATEGIES TO STRENGTHEN EACH UTILITY'S ABILITY TO COPE WITH SEVERE ACCIDENTS. THIS STRATEGY SHOULD BE BASED q

UPON THE IPE DETERMINATION OF (1) THE LEADING SEVERE ACCIDENT SEQUENCES, (2) THE MAIN CONTRIBUTORS FROM THOSE SEQUENCES, (3) THE POTENTIAL AREAS FOR IMPROVED PREVENTION AND MITIGATION, (4) ASSUMED RECOVERIES I AND RESPONSIBILITIES, AND L) EXISTING CAPABILITIES.

o INGREDIENTS TO SEVERE ACCIDENT MANAGEMENT:

1 ORGANIZATION: DELINEATE RESPONSIBILITIES AND COMMUNICATIONS LINES INSTRUMENTATION DETERMINE THE SURVIVABILITIES NEEDED AND EQUIPMENT: TO SUPPORT BOTH SEVERE ACCIDENT DIAGNOSTICS AND CORRECTIVE ACTIONS.

PROCEDURES AND IDENTIFY ACTIONS AND INSTRUCTIONS TRAINING: REVISE TRAINING PROGRAMS TO INCLUDE NEEDED ORGANIZATIONAL LEVELS AND THE POSSIBLE OUTCOMES FROM THE SEVERE ACCIDENT SEQUENCES.

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o A'RESEARCH. PROGRAM PLAN HAS BEEN OUTLINED AND'IS BEING DEVEt,0 PED o 0BJfCTIVESI TO PROVIDE'THE TECHNICAL BASIS T0' REVIEW IPE SUBMITTALS- o J.

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TO PROVIDE FOR INDEPENDENT ASSEdSNENTS 0F

' SEVERE ACCIDENT MANAGEMENT INCLUDING DESIGN MODIFICATIONS, J

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SHARE INSIG!lTS AND RESULTS WITH INDUSTRY o ELEMENTS OF THE PLAN:' '

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CORE MELT PREVENTION STRATEGIES i

IN-VESSEL MANAGEMENT STPATEGIES  ;

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CONTAINMENT AND RELEASE MANAGEMENT STRATEGIES HUMAN FACTORS, ORGANIZATION, AND TRAINING CONSIDERATIONS o SUBSTANTIAL RES RESOURCES '

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ACRS COMMENTS AND STAFF RESPONSE-(ACRS LETTER TO CHAIRMAN ZECH, DATED 6/9/87)

,- ACRS COMMENTS:.

y; o GENERALLY SUPPORTS THE GENERIC LETTER-PACKAGE BUT.., "THE PROPOSED GUIDANCE.IS DEFICIENT IN A NUMBER OF AREAS...".

THESE AREAS ARE:

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o GUIDANCE ON " VULNERABILITIES", ON: AMOUNT AND KIND OF IMPROVE-MENTS AND ON CRITERIA TO DETERMINE ADEQUACY OF IPE 0 GUIDANCE ON CONTAINMENT SYSTEM PERFORMANCE L o TRIAL REVIEWS OF SEVERAL PLANTS TO BE CARRIED OUT COOPERATIVELY WITH LICENSEES, 1

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o TRIAL REVIEWS HAVE SOME BENEFITS BUT WILL DELAY IMPLEMENTATION OF.IPE's ON MAJORITY OF PLANTS BY AT LEAST ONE YEAR. <

0 STAFF HAS IMPROVED GUIDANCE CONTAINMENT PERFORMANCE 4 ANALYSIS, WHICH WE BELIEVE SUBSTANTIALLY SATISFIED ACRS CONCERN.

O THFPFFDDE, NO TRIAL REVIEWS ARE PLANNED PRIOR TO ISSUING THE

, GENERIC LETTER FOR ALL PLANTS.

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TRIAL REVIEW o BECAUSE OF THE DIFFICULTY AND IMPORTANCE OF THE IPEs, THE ACRS-RECOMMENDED TRIAL REVIEW OF SEVERAL PLANTS g

LACK 0F TREATMENT OF SEVERAL IMPORTANT SAFETY RELATED T OUESTIONS IN THE REVIEW 0F THE CONTAINMENT, APPLICATIONS HAD THE BENEFIT OF A FULL SCOPE PRA NEED ADD,ITIONAL INFORMATION ON THE APPLICATION TO PLANTS WITH NO PRA, THEREFORE, REVIEW 0F FEW PLANTS THAT DO NOT HAVE PRAs IS IMPORTANT TO EXCHANGE-KNOWLEDGE AND EXPERIENCE BETWEEN THE STAFF, ITS CONTRACTORS AND THE UTILITIES AND THEIR CONTRACTORS.

INSIGHTS FROM THE COOPERATIVE REVIEW WILL BE SHARED WITH p OTHER UTILITIES IN REGIONAL AND HEADQUARTER MEETINGS, f o BENEFIT CF SUCH TRIAL REVIEW:

1 IT REDUCES THE STAFF RESOURCES NEEDED TO REVIEW AND i AUDIT THE SUBMITTAL IF CONSISTENT PROCEDURES ARE FOLLOWED ON HOW TO PERFORM THE IPE HELP TO ESTABLISH THE "MAKE UP" 0F THE EXAMINATION TEAM IDENTIFY THE AMOUNT AND DETAIL OF BACK UP INFORMATION (E.G., PLANTS DRAWING, VENDOR BOOKS, TECH SPEC, LER)

BEFORE REVIEW STARTS, i

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y. 9 I-IPE SCHEDULE fo: ISSUE IPE GENERIC LETTER TO UTILITIES 12/01/87.

.NRR/RES' REGIONAL MEETINGS TO IilSCUSS a- IPE PROCESS 0- UTILITY RESPONSE' 04/01/88

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I QUARTERLY MEETINGS AT NRC HEADQUARTERS, kV ~

COOPERATIVE REVIEW 0F SEVERAL PLANTS WITH NO PREVIOUS SYSTEMATIC ANALYSIS (E.G., RQ PRA) T0. GUIDE THEM THRU THE IPE USE INFORMATION TO SHARPEN IPE GUIDANCE

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o IPE SUBMITTALS FOR PLANTS WITH 02/01/89 PREVIOUS SYSTEMATIC ANALYSES PROGRAM COMPLETION DATE. EXPECTED BY END-1990 WITH PLANT PROPOSED FIXES (IF NEEDED). FEW PLANTS MIGHT HAVE COMPLETED IMPLEMENTATION OF THOSE FIXES ALSO,

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.PEMAINING METHODS ISSUES 9

o SOME MAAP MODELS ARE JUDGED TO INADEQUATELY CONSIDER OTHER POSSIBLE SEVERE ACCIDENT GUTCOMES AND NEED T0.BE ADJUSTED T0= COMPLY.WITH DISPOSITION OF 18 NRC/IDCOR TECHNICAL ISSUES, o- NO UNCERTAINTY ANALYSIS PROVIDED.

o BECAUSE THE IDCOR REFERENCE PLANT ACCIDENT PROGRESSION AND SOURCE TERMS ARE BASED ON MAAP MODELS, THE IDCOR REFERENCE PLANT BACK END ANALYSES NEED TO BE REVISED TO REFLECT ISSUE DISPOSITION, o . FOLLOW-0N TECHNICAL MEETINGS NEEDED, r

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r CONSIDERATIONOFEXTERNALHAZARDSINIPEs

. (SECY-86-162) o PAST IDCOR AND NRC WORK WAS FOCUSED ON INTERNAL HAZARDS.

o RECENT WORK ON EXTERNAL HAZARDS IS-SUBSTANTIAL.

'< o CURRENTLV WE BELIEVE THAT EXTERNAL HAZARDS NEED TO BE i CONSIDERED.

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[ o GENERIC LETTER ENCOURAGES JOINT CONSIDERATION WITH INTERNAL IPEs. ,

o REMAINING WORK IS:

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- SELECTION OF EXTERNAL HAZARDS THAT SHOULD BE EXAMINED, 1 L

DEVELOP GUIDANCE OR ABBREVIATED EXAMINATION METHODS FOR THE SELECTED EXTERNAL HAZARDS.

o INDUSTRY CAN:

PROVIDE DETAILED JUSTIFICATION FOR SELECTING EXTERNAL HAZARDS ~

PROVIDE ABBREVIATED EXAMINATION METHODS i Lw____-__-.-.__.m_---._m -_ .