ML20150B294
| ML20150B294 | |
| Person / Time | |
|---|---|
| Issue date: | 06/24/1988 |
| From: | Shao L NRC - EXTERNAL EVENTS STEERING GROUP |
| To: | Arlotto G, Novak T, Sheron B NRC - EXTERNAL EVENTS STEERING GROUP |
| References | |
| NUDOCS 8807110457 | |
| Download: ML20150B294 (16) | |
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JUN 2 4 1988 MEMORANDUM FOR:
G. A. Arlotto, Member, EESG, RES T. A. Novak, Member, EESG, AE00 B. Sheron, Member, EESG, RES W. Minners, Deputy Director Division of Reactor and Plant Systems, RES FROM:
L. C. Shao, Chairman,.t.SG, NRR
SUBJECT:
SUMMARY
OF MEETING WITH NUMARC AND EPRI ON EXTERNAL EVENTS On June 2, 1988 the EESG met with representatives of the Nuclear Utilities Management and Resources Council (NUMARC) and the Electric Power Research Institute (EPRI) to discuss external event issues. provides the list of attendees, Enclosure 2 provides the meeting agenda and the Enclosure 3 contains materials presented by various speakers.
The meeting started with my opening (remarks indicating that the staff has formed the External Events Steering Group EESG) in order to establish methods that are suitable for examining individual plants for severe accidents within the context of external hazards. The staff provided handout material (see Enclosure 3) showing the membership of EESG and its three subcomittees. The meeting agenda was followed in an informal way and the issues were discussed in a question and answer format. Mr. W. Rasin of NUMARC pointed out that the IDCOR program (Industry Degraded Core Program) deliberate'y excluded external events and he felt that seismic hazard is the only area woere a significant amount of work has been done by both the industry and the staff.
Mr. Rasin indicated that NUMARC has formed the Severe Accident Working Group (SAWG) under the direction of Mr. Cordell Reed to continue the integration of the industry efforts to deal with severe accidents, and to continue the coordination with the staff as a follow on to the IDCOR effort.
NUMARC is also in the process of establishing the Seismic Working Group (SWG). External hazards such as fire, flood and extreme wind will be reviewed by SAWG and Seismic hazard will be reviewed by SWG of NUMARC respectively. We explored how the industry intends to address accident management and establish a balance between accident prevention and mitigation.
Mr. Rasin pointed out that the accident management question goes beyond the severe accident policy, but NUMARC is in agreement with the ttaff or, the need to work on the accident management issues and would work with the staff to bring them to a resolution; however, the industry effort would be concentrated on cost-effective plant fixes that improve plant safety.
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" There was much' discussion about fire hazard.
Dr. J. T. Chen, NRC, pointed out that based on past PRA studies, fire hazard was shown to have frequently contributed significantly to the core damage frequency. Mr. Rasin expressed his disagreement with the results of the fire scoping study performed for NRC by the Sandia National Laboratories. We encouraged more studies by the industry on fire vulnerability and indicated that simplified methods for fire hazard may have to be developed.
Each of the three subcomittee chairmen under the NRC EESG briefly discussed the status of his progress.
Mr. Bagchi distributed copies of handout material on external event issues and the plan for resolution (see Enclosure 3).
The meeting was adjourned with the following comitments from NUMARC:
(1) A letter will be sent to NRC by the end of June, 1988 to inform NRC staff the formation and charter of NUMARC working groups.
(2) NUMARC will review SECY-88-14, "Integration Plan For Closure of Severe Accident Issues."
(3) NUMARC will propose a meeting with the office directors of Nuclear Reactor Regulation and Nuclear Regulatory Research in July, 1988.
L. C. Shao, Chaiman, EESG, NRR
Enclosures:
- List of Attendees : Meeting Agenda : Meeting handouts Membership of EESG and Subconnittees by L. C. Shao External Event issues by G. Bagchi cc:
See Distribution Public Docket Roon Central-Filel*
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'f DISTRIBUl10N T. Murley, NRR W. Rasin, NUMARC J. Sniezek, NRR G. Vine, NUMARC (EPRI REP)
E. Beckjord, RES
_D. Rubio, EPRI D. Ross, RES F. Rahn, EPRI E. Jordan, AE00 L. C. Shao, NRR G. A. Arlotto, RES B. Sheron, RES T. M. Novak, AE00 W. Minners, RES
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W. Houston, RES C. McCracken, NRR F. Coffman, RES C. Thomas, NRR T. Cox, NRR
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R. Barrett, NRR F.~Hebdon, NRR W. Schwink, NRR J. E. Richardson, NRR A. Thadani, NRR G. Bagchi, NRR A. Murphy, RES
'W. Beckner, RES D. C. Jeng, NRR L. Reiter, NRR N. Chokshi, RES J. Chen, RES N. Anderson, RES J. Flack, RES D. Notley, NRR A. El-Bassioni, NRR G. Wiseman, Ril A. Datta, RES B. Hardin, RES
,J. Strosnider, R1 R. Wescott, OSP K. Campe, NRR T. Cheng, OSP K. Manoly, NRR f
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J ENCLOSURE 1 MEETING WITH NUMARC/EPRI list of Attendees
' Names-
-Affiliation GBagchi NRC/NRR W. Minners NRC/RES
-William Beckne NRC/RES Kamal.Manoly NRC/NRR
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Jim' Richardson NRC/NRR Nilesh Chokshi NRC/RES John T. Chen NRC/RES David C. Jeng David P. Notley
'1NRC/ DEST NRR/ECEB Leon Reiter NRR/ESGB
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Andrew J. Murphy.
RES/DE/SSEB Don-Rubio.
EPRI T. M. Novak NRC/AEOD/DSP Frank Rahn EPRI Larry Shao NRC/NRR l
Bill Rasin NUMARC Gary Vine EPRI REP TO NUMARC t
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AGENDA FOR EESG-NUMARC/EPRI MEETING June 2, 1988 OWFN, 2:00 p.m - 4:00 p.m. Room 12B11 2:00 p.m Opening Remarks L. Shao and and EESG Purpose Other EESG Members 2:05 p.m NUMARC/EPRI Perspective NUMARC/iPRI on External Events IPEs 2:15 p.m NRC EESG Subcommittees, L. Shao/G. Bagchi Plan and Schedule NRR Subc.)mmittee Chairmen 2:45 p.m NUMARC/EPRI Plan NUMARC/EPRI and schedule for resolving the external event issues (Earthquakes, Fires, Flood, High Wind, Transportation) 3:45 p.m Action Items and Future G. Bagchi/NUMARC/EPRI Meeting (s)
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ENCLOSURE 3.
NRC EXTERNAL EVENTS STEERING GROUP MEMBERSHIP CHAIRMAN:
L. C. SHA0 NRR MEMBERS:
G. ARLOTTO RES T
NOVAK AE0D B. SHERON RES EXECUTIVE G
BAGCHI NRR SECRETARY:
EXTERNAL EVENTS STEERING GROUP SUBCOMMITTEES SEISMIC-SUBCOMMITTEE:
C0-CHAIRMAN:
A. MURPHY RES C0-CHAIRMAN:
L. REITER NRR MEMBERS:
D. JENG NRR N. CH0KSHI RES J. CHEN RES N
ANDERSON RES G. BAGCHI NRR FIRES SUBCOMMITTEE:
CHAIRMAN:
C. MCCRACKEN NRR MEMBERS:
J. FLACK RES D
NOTLEY NRR A
EL-BASS 10NI NRR G. WISEMAN RII A. DATTA RES J. CHEN RES B. HARDIN RES HIGH WIND, FLOOD AND OTHERS SUBCOMMITTEE:
C0-CHAIRMAN:
D. JENG NRR C0-CHAIRMAN:
W. BECKNER RES MEMBERS:
T. CHENG OSP J, STR0 SNIDER (RI)
K. CAMPE NRR l
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4 ON EXTERNAL EVENTS-GOUTAM BAGCHI, CHIEF STRUCTURAL AND GEOSCIENCES BRANCH, NRR
'AND EXECUTIVE SECRETARY, EXTERNAL EVENTS STEERING GROUP JUNE 2, 1988 I
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EXTERNAL EVENT ISSUES MANY POSSIBLE SOURCES OF HAZARD SOME MORE IMPORTANT THAN OTHERS OFTEN LARGE UNCERTAINTIES IN ESTIMATING FREQUENCY OF RARE EVENTS CONSENSUS DOESN'T EXIST ON USING PROBABILISTIC METHODS FOR SOME EVENTS NATURAL HAZARD DESIGN CRITERIA MAY BE OUT-OF-DATE NRC HAS DIFFERENT PROGRAMS ADDRESSING DIFFERENT DESIGN AND BEYOND DESIGN BASIS EVENTS NEED TO DETERMINE PROPER MIX OF PROBABILISTIC AND DETERMINISTIC APPROACH FOR DlFFERENT HAZARDS IN SEVERE ACCIDENT POLICY / IMPLEMENTATION NEED FOR INTEGRATION AND/0R C0 ORDINATION WITH EXISTING PROGRAMS I
L EARTHOUAKES ISSUE e
- UNCERTAINTIES IN SEISMIC HAZARD AND CHANGING DESIGN PROCEDURES HAVE LED TO SEVERAL PROGRAMS TO ADDRESS DIFFERENT ASPECTS OF DESIGN AND BEYOND DESIGN BASIS EARTHQUAKES PROPOSED TASKS
- ASSESS - INDIVIDUAL PROGRAMS (E.G. A-45, A-46, SEIS-MIC DESIGN MARGINS, CHARLESTON EARTHOUAKE) IN LIGHT OF SEVERE ACCIDENT POLICY
- DEFINE PROBABILISTIC/ DETERMINISTIC MIX OF SEVERE ACCIDENT SEISMIC POLICY
- DEFINE SEVERE ACCIDENT POLICY IMPLEMENTATION MAKING OPTIMAL USE OF EXISTING PROGRAMS AND MINIMlZING OVERLAP SCHEDULE
- COORDINATED EARTHOUAKE POLICY AND D'EFINE SEVERE ACCI-DENT IMPLEMENTATION METHOD IN 18 MONTHS
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INTERNAL FIRES ISSUE BASED ON THE RESULTS FROM MORE THAN 10 PRAs,
- INTERNAL FIRES CONTRIBUTE BETWEEN 10% AND 60% OF CORE MELT PROBABILITY, RESULTS ARE PLANT SPECIFIC (!,E, A DUPLICATE UNIT CAN HAVE A DIFFERENT PROBABILITY),
EARLY CONTAINMENT FAILURE SEQUENCES DUE TO FIRE ARE LIMITED,
- FIRE RISK SCOPING STUDY INDICATES THAT PLANT SPECIFIC ISSUES MAY RESULT IN HIGHER CORE MELT PROBABILITIES THAN SHOWN BY CURRENT PRAs PROPOSED TASK
- IDENTIFY LEAD PLANT AND CONDUCT A STAFF EVALUATION OF THEIR FULL SCOPE FIRE PRA METHODOLOGY (STAFF REVIEW IN PROGRESS FOR BRUNSWICK)
- MEET WITH INDUSTRY GROUPS
- PROVIDE STAFF APPROVAL FOR FULL SCOPE FIRE PRA METHODOLOGY
- INTEGRATE RESULTS OF ONG0ING FIRE RISK SCOPING STUDY
- EVALUATE INDUSTRY PROPOSALS
- DEVELOP IPE METHOD FOR EVALUATING INTERNAL FIRE INITIATED ACCIDENTS SCHEDULE
- DEVELOP DRAFT IPE METHODOLOGY IN 16 MONTHS AND FINAL METHODOLOGY IN 24 MONTHS
EXTERNAL FLOODS ISSUE UNCERTAINTY AND LACK OF CONSENSUS-WITH RESPECT TO PROBABILISTIC DESCRIPTION OF EXTREME FLOOD HAZARD, NRC CRITERIA ARE DETERMINISTIC PROPOSED TASKS DETERMINE FEASIBILITY OF DEVELOPING PROBABILISTIC EXTREME FLOOD HAZARD USING PROBABILISTIC APPROACH (IF AVAILABLE) OR ALTER-NATE DETERMINSTIC METHODS TO DEFINE METHODOLOGY FOR DEAL-ING WITH EXTERNAL FLOOD INDUCED SEVERE ACCIDENTS FIND PLANT SPECIFIC VULNERABILITIES r
SCHEDULE PANEL REPORT WITHIN 6 MONTHS SEVERE ACCIDENT METHODOLOGY WITHIN 18 MONTHS
d HIGH WIND AND TORNAD0ES SOURCES OF POTENTIAL HIGH WIND / TORNADO DAMAGE:
DIRECT DAMAGE DUE TO DYNAMIC WIND LOADING.
TORNADO MISSILES ATMOSPHERIC PRESSURE CHANGE.
TORNADOES MAY OCCUR PRACTICALLY ANYWHERE IN U.S.
BUT OCCUR MORE FREQUENTLY IN THE EAST 4
HIGH WIND STORMS MAY ALSO OCCUR ANYWHERE IN U.S.
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- - 0FFSITE POWER LOSS OR HIGH PROBABILITY OF FAILURE
' WIND DAMAGE ~0F STACKSIF PRESENT, MAY JE0PARDIZE THE PLANT OUTD0OR TANKS ARE SUSCEPTIBLE TO WIND DAMAGE
- ' NONSAFETY GRADE STRUCTURES OR COMPONENTS MAY CONTROL PLANT
RESPONSE
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TORNADOES-AND HIGH WINDS SHOULD BE CONSIDERED AMONG THE EXTERNAL HAZARDS TO NUCLEAR POWER PLANTS IT IS POSSIBLE TO SEPARATE THE PROBABILISTIC ANALYSIS OF THE INITIATING EVENT (HIGH WIND /TORNAD0) FROM THE PROBABILISTIC ANALYSIS OF THE PLANT RESPONSE TO THE INITIATING EVENT ABOUT ONE-HALF THE PLANTS WILL HAVE TO ASSESS VULNERABILITIES TO THE WIND AND TORNADO HAZARD l
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PLAN OF ATTACK THE F0LLOWING STEPS WILL BE FOLLOW " TO DEVELOP A COMPREHENSIVE REPORT:
CLEAR-CUT DEFINITION OF SUBTASKS AND G0ALS COMPILATION OF A BACKGROUND DOCUMENT COVERING STATUS, G0ALS AND FINDINGS OF ONG0ING PROGRAMS INTEGRATION OF ONG0ING EFFORTS BY INDUSTRY AND NATIONAL LABS RELATED TO EXTERNAL EVENTS PROPER USE OF DETERMINISTIC AND/0R PROBABILISTIC CRITERIA ESTABLISH INTERFACE WITH INDUSTRY FOR A BETTER UNDERSTANDING OF ISSUES UTILIZATION OF CONSULTANTS WITH STAFF EFFORT IN THE TECHNICAL MANAGEMENT OF THE PROGRAM