ML20128M890

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Discusses Proposed Commission Policy Statement on Severe Accidents & Impact on GESSAR-II PRA Review Schedule. Substantive Bases Can Be Developed for Making Decisions on GESSAR-II W/Modest Rev to Schedule
ML20128M890
Person / Time
Site: 05000000, 05000447
Issue date: 01/24/1983
From: Mattson R, Speis T, Vollmer R
Office of Nuclear Reactor Regulation
To: Eisenhut D
Office of Nuclear Reactor Regulation
Shared Package
ML20127A894 List: ... further results
References
FOIA-85-110 NUDOCS 8507130011
Download: ML20128M890 (3)
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UNTTED STATES

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NUCLEAR REGULATORY COMMISSION amsumarow. o.c.nasss O a

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M 24 333 MEMORANDUM FOR: Darrell G. Eisenhut,' Director Division ~of Licensing FROM: Roger J. Mattson, Director, DSI Richard H. Vollmer, Director, DE Themis P. Speis, Director, DST

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SUBJECT:

PROPOSED C0ttGSSIDN POLICY ' STATEMENT ON SEVERE ACCIDENTS

! .AND.ITS. IMPACT ON.THE GESSAR-II PRA REVIEW SCHEDULE .

! The proposed Commission Policy Statement on Severe Accidents would require

<i consideration of design and operations improvements on future plants to reduce the risk from severe accidents. A major feature of the policy would be the use of PRAs in arriving at decisions regarding the need for any additional

, accident preventive or mitigative features. The purpose of this memorandum is to inform you about our approach for making timely Severe Accident Policy decisions during the ongoing GESSAR-II review, pending final Commission decisionsandongoingresearchonrelatedmatters. The late submittal of General Electric s external events PRA for GESSAR-II and delays in the -

completion of the NRC sourte term assessment, would prohibit the staff from

making final decisions regarding any new requirements for the GESSAR-II -

design during this calendar year. We do not recommend the use of the WASil-1400 era source term for making major decisions on the GESSAR-II design since the .

perceived conservatism in the WASH-1400 source term would distort our value impact judgments.

The current GESSAR-II PRA review schedule presumed that a revised source term methodology would be available in June 1983 and that the external events PRA would be submitted in time to permit staff review in 1983. The present schedule for submittal by GE of the GESSAR-II external events PRA is October 1983 and the-completion and formal mlease 'af the revised source term methodology is now projected for July 1984 (following American Physical Society (APS) review).

We do not recommend delaying the issuance of our SER until after the ,

completion of the APS review of the source term. Instead we believe that substantive bases can be developed for making decisions on GESSAR-II with a modest revision to the schedule. The milestones for the revised sr.hedule would be:

GE ' submits external . events PRA 10/31/83 .

  • Revised source temiethodology available to 12/31/83 the staff from the Accident Source Term ~

Program Office (same as MK III version referied to APS) 0507130011 850415

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  • GE submits reanalysis of value and impact 02/29/84 of severe accident design and operations features using new source term
  • Staff preliminary assessment of GE external 03/15/84 events PRA
  • Staff SER to DL which includes external events 05/15/84 and th,e , revised source,, term The staff SER to DL in May 1984 will contain a proviso that if the isource term changes significantly as a result of the APS review, the SER would te supplemented in the course of rulemaking for certification of the GESSAR-II
: design. Also, if the GE reanalysis resulting from the staff external events review is not completed in time for the May 1984 SER, a final assessment will se issued'in a supplemental SER in the course of rulemaking. It is our understanding that the Director of NRR and the EDO should be asked to approve this proposed use of the revised source term before notifying GE and the ACRS

.on the revised schedule.

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Roger J. attson, Director, DSI R

er ichard H. V 4%

o 1mer, i ector, DE lb l Themis P. Speis, Director, DST ~

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ENCLOSURE GESSAR II SEVERE ACCIDENT REVIEW SCREDULES ,

Milestone _ Current Proposed GE submits external events PRA

- 09-27-83 GE submits external events uncertainty analysis - 12431-83 Q's received by PM

  • '02-03-84
  • D2-08-84 Q's issued to GE . . . .. . ,

GE responses to Q's received -* 02-29-84 Staff positions to GE ~ 07-01-83 04-02-84 Safety evaluation input to PM '02-01-84 '05-15-84 Safety'evaluatton issued 03-01-84 ~ 06-15-84

  • New datt. .. ate to external events PRA; internal event Q's are ,

currently being responded to. .

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