ML20133G997

Summary of ACRS SEP Subcommittee on San Onofre in Washington,Dc Re Integrated Plant Safety Analysis Rept

ML20133G997
Person / Time
Site:	San Onofre
Issue date:	07/10/1985
From:	Advisory Committee on Reactor Safeguards
To:	Advisory Committee on Reactor Safeguards
References
ACRS-2329, NUDOCS 8508090149
Download: ML20133G997 (10)

Text

CERTIFIED COPY 9  % e[ DATE ISSUED: 7/10/85 l f'

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l MINUTES OF THE ACRS SUBCOMMITTEE MEETING OF '

- SYSTEMATIC EVALUATION PROGRAM SUBCOMMITTEE ON SAN ON0FRE JUNE 19, 1985 WASHINGTON, DC i

A meeting was held by the ACRS Systematic Evaluation Program Subcomittee on San Onofre. The purpose of the meeting was to review the Integrated Plant Safety Analysis Report on San Onofre. Notice of the meeting was published in the Federal Register on Friday, May 31, 1985 (Attachment A). The schedule of items covered in the meeting is in Attachment B. The list of attendees is in The handouts are filed Attachment C. A list of handouts is in Attachment D.

with the office ccpy of this sumary/ minutes. H. Alderman was the ACRS staff member for this meeting. Chairman C. Siess convened the meeting at 8:30 A.M.

PRINCIPAL ATTENDEES:

Southern California San Diego Gas NRC Staff Edison and Electric ACRS Members M. Medford T. Phillips C. P. Siess, Chairman C. Grimes D. A. Ward E. McKenna K. Baskin C. J. Wylie W. Paulson J. Rainsberry R. Dudley M. Short T. Cheng J. Hammond ACRS Staff H. Alderman C. Grimes, Chief, Systematic Evaluation Program Branch Mr. Grimes noted that the seismic issue has two components: the return to service plan that allowed restart of the reactor, and the long-term service l

og plan to resolve long term items.

5' O

M. Medford, Southern California Edison Q

Mr. Medford gave a brief description of the Plant. The licensed thermal power g rating is 4347 MWt. The approximate electrical capacity is 450 MWe. The Plant y

is a three-loop, Westinghouse NSS. The architect-engineer was the Bechtel g@ Corporation. The fuel is stainless steel clad. There are two major, unique

• '" design features. The safety injection system involves a transfer of the feed

' U @AIED CRIGIyAy, a e y o m n.an,_ ,ef,e orecous NU N dY h '

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• - 2- JUNE 19, 1985 3

MINUTES FOR THE l '

6/19/85 SAN ONOFRE-SEP REVIEW i MEETING i The second L system from the feed function to the safety injection function.

In 1976 l unique design difference is that there are no main steam stop valves.

the diesel generators were installed. They have an actual capacity of about 9 l

' At the same outage the megawatts, although the Plant relies on 6 megawatts. t j sphere enclosure project was completed. The objective was to reduce " shine" to the exclusion area. t E. McKenna Integrated Assessment Project Manager, San Onofre, OVERVIEW Ms. McKenna noted that of the 137 topics considered for San Onofre, 24 topics l

were deleted on a generic basis, 24 topics were deleted on a plant-specific i i

basis, so that a total of 89 topics were considered. During the review 53 topics were found to be acceptable, which left 36 to be addressed in the integrated assessment. The 36 topics included 86 issues. Of the 86 issues, 41 issues were determined to require no further action; 5 issues required hardware l modifications; 12 issues required procedural or Technical Specification changes; and 26 issues required further evaluation. The seismic issue is i

listed under further evaluation. '

c E. McKenna Integrated Assessment Project Manager, San Onofre, PROBABILISTIC RISK ASSESSMENT Mr. Grimes pointed out that San Onofre did not have a plant-specific PRA, and a y

surrogatePRA(Surry)wasused. M. Rubin pointed out that one area where the PRA technique was used was the switchover from the injection mode to recircu-lation mode. The switchover is manual. The concern of failure to switchover  !

Based on PRA techniques, the i at the proper time could cause pump cavitations.

Staff rate this issue as a high risk.

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Ms. McKenna remarked that inadvertent tsunami gate closure was determined to '

i have low risk significance. Nevertheless, the tsunami gates were removed since i other studjes had shown they were not needed.

T. Cheng, SEP Program, STATUS REPORT ON THE SEISMIC UPGRADE 1 ,

i j

• - 3- JUNE 19, 1985

' MINUTES FOR THE 6/19/85 EAN ON0FRE-SEP REVIEW MEETING Mr. Cheng pointed out that, as a result of the Staff's review of the Unit I return to service program, the Staff is assured that the Plant has the capa-bility to maintain its hot standby condition following a 0.67g earthquake.

This conclusion was reached based upon an audit review and confinnatory analy-sis for selected piping and equipment systems.

On March 12, 1985 the Licensee proposed its long-tenn service program and the criteria, methods, and analysis to be used. This program will assure that the Plant will possess the capability for cold shutdown and accident mitigation.

The Staff's review will concentrate on the acceptability of the proposed reevaluation criteria and analysis method. In addition, the Staff will conduct an audit review and will perform a confirmatory analysis by sampling on a selected basis.

l E. McKenna, Integrated Assessment Project Manager, San Onofre, OPEN ISSUES -

Ms. McKenna discussed the switchover from the infection mode to the recircu-lation mode. She noted that the feedwater pumps are used in conjunction with the charging pumps during the initial phase of injection. The feedwater pumps are 10,000 gpm per pump. At about the 21% level in the refueling water storage tank, an alarm sounds. The operator has to trip the feedwater pumps and realign valves to take suction from the sump in about 3 minutes.

The Staff's concern is that the time is not adequate and if the switchover is not accomplished in time, loss of NPSH and cavitation in the charging pumps could damage tha pumps. The Staff proposes an automatic trip of the feedwater pumps. The Licensee's position is that their operators can realign the valves in this tine. The Licensee also stated that they would like to see if there are any possible detrimental effects of automatic feedwater pump trip.

Ms. McKenna pointed out that tornado missile protection was another area of disagreement. The basic disagreement involves what is the appropriate hazard function for the Plant. The Staff and the Licensee have both performed l

l 1

- 4- JUNE 19, 1985 MINUTES FOR THE 6/19/85 SAN ONOFRE-SEP REVIEW MEETING Dr.

calculations of the hazard function and these calculations do not agree.

Siess pointed out that resolution of the discrepancies in these calculations did not fall within the scope of the SEP Subcommittee.

E. McKenna, ISSUES REQUIRING FURTHER EVALUATION Two issues that Ms. McKenna noted were:

• Roof ponding; the capability of the loops to take the ponding load.

The Licensee has done an analysis which concludes the roofs are capable of withstanding the load. The Staff is reviewing this analysis.

• Foundation settlement. This involves long-term settlement. The Corps of Engineers will do some more site studies. This report is expected to resolve this issue.

E. McKenna, HARDWARE MODIFICATIONS The most significant items under this category were:

This, added

• Adding an additional motor-driven, auxiliary feedwater pump.

to the present turbine-driven and motor-driven auxiliary feedwater pumps, will add to the reliability of the auxiliary feedwater system.

• Dedicating a diesel generator for shutdown systems will provide capabil-ity for plant shutdown independent of certain fire areas.

The Subcommittee meeting was adjourned at 2:00 P.M.

NOTE: A complete transcript of the meeting is on file at the NRC Public Document Room at 1717 H St., NW., Washington, D.C. or can be

-obtained at cost from Ann Riley & Associates,1625 I St., N.W., Suite 921, Washington, D. C. 20006, Phone: (202) 293-3950

njj > >, m. - i os 13206 Federal Regist:r / Vcl. !,0. N .105 / Frid:y. hty 31. 1985 / N;tices

- t W rg:nda for subject meeting sh:11 mnting cn lun218. Ro:m 1046.1717 H Advisory Committee on Reactor e be ce follows: Street. NW, Washington. DC. Safeguards Subcommittee on Tuesday. June.JA 1935-imp m. until The entire meeting will be open to Systematic Evaluation Program (San '

public attendance. Onofre); Meeting the conclusion of business

• He Subcommittees will explore the The agenda for the subject meeting eA ubcomm. Hee on us? of natural aptitude selection shall be as follows: Systematic Evaluation Program (San procedures, tests, and evaluations. Tuesday.fune la 1985-430 a m. until Onofre) will hold a meeting on june 19.

Oral statements may be presented by 1985. Room 1046.1717 H Street. NW.

members of the public with the the conc!.ssion of business Washington, DC. .,

concurrence of the Subcornmittee The Subcommittee will review the ne entire meeting will be open to Ch:irman; written statements will be maintenance and sun eillance program ccc:pted and made available to the public attendance.

plan.

Committee. Recordings will be permitted %e agenda for the subject meeting Oral statements may be presented by shall be as follows-cnly during those portions of the ,

l members of the pub!,c with the mnting when a transcript is being kep,' Wednesday. June 19.198.%&30 a.m. until l cnd questions may be asked only by concurrence of the Subcommittee Chairman; written statements will be the conclusion of busmess i

' m:mbers of the Subcommittee,its accepted and made available to the The Subcommittee will review the consultants, and Staff. Persons desiring 13 make oral statements should notify Committee. Recordings will be permitted Integrated Plant Safety Analysis Report [

I th? ACRS staff member named below as only during those portions of the (IPSAR) for San Onofre Unit 1.

far in advance as is practicable so that meeting when a transcript is being kept. Oral statements may be presented by  !

and questions may be asked only by members of the public with the i cppropriate arrangements can be made, During the initial portion of the members of the Subcommittee.its concurrence of the Subcommittee m:eting. the Subcommittee, along with consultants. and Staff. Persons desiring Chairman, written statements will be tny of its consultants who may be to make oral statements should notify accepted and made available to the present, may eschange preliminary the ACRS staff member named below as Committee. Recordings will be permitted views regarding matters to be far in advance as is practicable so that only during those portions of the c:nsidered durmg the balance of the appropriate arrangements can be made. meeting when a transcript is being kept.

During the initial portion of the and questions may be asked only by ubcommittee will then hear meeting. the Subcommittee, along with members of the Subcommittee. its presentations by and hold d:scussions consultants and Staff. Persons desiring any of its consultants who may be with representatnes of the NRC Staff, to make oral statements should notify present. may exchange preliminary its consultants. and other interested the ACRS staff rnember named below as persons regarding this resiew. view s regarding matters to be considering during the balance of the far in advance as is practicable so that

- Further information regard;ng topica appropriate arrangements can be made.

t) be discussed, whether the meeting meetmg.

his been canceted or rescheduled, the During the initial portion af t'.e ne Subcommittee will then hear meeting. the Subcommit!<e. along with Ch:frman's ruling on requests for the presentations by and hold discussions cpportunity to present oral statements with representatives of the NRC Staff, any of its consultants *ho may be cnd the time allotted therefor can be its consultants, and other interested present, may exchange preliminary cbtamed by a prepaid telephone call to views regarding matters to be persons regarding this review. considered during the balance of the th2 cognizant ACRS staff member.Mr.

J;hn Schiffgens or Mr. Herman Further information regarding topica meeting.

Alderman (telephone 202/634-1414) to be discussed, whether the meeting The Subcommittee will then hear between 815 a m. and 5 00 p m.. EDT. has been cance!!ed or rescheduled. the presentations by and hold discussions Persons planrung to attend this meeting Chairman a ruling on requests for the with representatives of the NRC Staff, are urged to contact the abos e named opportunity to present oral statements its consultants, and other interested individual one or two dan s before the and the time allotted therefor can be pers ns regarding this review.

scheduled meeting to be advised of any obtained by a prepaid telephone call to Further information regarding topics ch nges in schedule, etc., which may the cognizent ACRS staff member.Mr. to be discussed, whether the meeting have occurred. fferman Alderman (telephone 202/634- has been cancelled or rescheduled, the  ;

Dated May 23.1985. 1414) between 8.15 a m. and 5.00 p m., Chairman ruling on requests for the EDT. Persons planning to attend this Morton W. Ubarkia. opportunity to present oral statements meeting are urged to contact the above A s sis tant En ecutiv e Directorfor Project and the time allotted therefor can be Renie w, individual one or two days before the obtained by a prepaid ttlephone call to scheduled meeting to be advised of any

[FR Don 8k13090 nied 5-30-85. e es em] the cognizant ACRS staff member Mr.

sumo coot riews.es changes in schedule, etc., which may Herman Alderman (telephone 202/634-have occurred. 1414) between 815 a.m. and 5 00 p.m Advisory Committee ori Reactor Dated. May z3.19ss. EDT. Persons planning to attend this Safeguards, Subcommittee oft Morton W. Ubarkin. meeting are urged to contact the above

• Maintenance Practices and A ssistant Es ecutive D&ectorfor Pro /cet named individual one or two days -

Procedures; Meeting 3,,j, w. before the scheduled meeting to be adsised of any changes in schedules.

The ACRS Subcommittee on [FR Doc. 8b13099. Eled 545-85 a 45 am]

etc., which may have occurred.

Maintensoce and Procedures will hold a au mo coo rie m as s

AM7

/b 6 TENTATIVE MEETING SCHEDULE ACRS SEP SUBCOEITTEE MEETING SAN ONOFRE NUCLEAR GENERATING STATION UNIT 1 June 19,1985 Introduction (C. Grimes, NRC) 8:30 a.m.

(E. McKenna , NRC) 8:45 a.m. Integrated Assessment Sumary

- SEP Topics Deleted

- Topics That Meet or are Equivalent to Current Criteria

- Issues Differing from Current Criteria Application of PRA (B. Atefi, SAI/M. Rubin, NRC) 20:00 a.m.

• • • "* BREAK 10:45 a.m.

Status Report on Seismic Upgrade (T.Cheng,NRC) 10:55 a.m.

LUNCH 12:00 NOON 1:00 p.m. Issues Requiring Procedural or Tech. Spec. Changes (E. McKenna)

Issues Requiring Further Evaluation (E. McKenna) 2:00 p.m.

BREAK 3:00 P.M.

Issue Requiring Hardware Backfits (E. McKenna) 3:10 p.m.

4:00 p.m. Issues Requiring Additional Engineering Evaluation (E. McKenna) 4:30 p.m. Conclusions 5:00 p.m. ADJOURN

l LCBS SUBCOMMfTTEC MEETING ON SYSTEMATIC EVALUATION _ PROGR  !

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ATTACHMENT D -

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LIST OF HANDOUTS:

.- l. SEP Integrated Assessment - E. McKenna 1

2. San Onofre Seismic Revaluation - T. Cheng

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