ML13333B783

Summary of 820908 Meeting W/Util Re Licensee Proposed Mods to Safety Injection Sys,Developed in Response to 810903 Event Involving Failure of Valves to Open.Current & Proposed Modified Sys Encl

ML13333B783
Person / Time
Site:	San Onofre
Issue date:	09/13/1982
From:	Paulson W Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
NUDOCS 8209230030
Download: ML13333B783 (15)

Text

September 13, 1982 Docket No. 50-206 LICENSEE: SOUTHERN CALIFORNIA EDISON COMPANY FACILITY: SAN ONOFRE NUCLEAR GENERATING STATION, UNIT NO. 1

SUMMARY

OF SEPTEMBER 8, 1982 MEETING On September 8, 1982, members of the NRC staff met with representatives of Southern California Edison Company. The purpose of the meeting was to discuss the licensee's proposed modificatdons to the San Onofre Unit No. 1 safety injection system. Enclosure 1 is a list of attendees.

On September 3, 1981, neither of the safety injection system valves, located in the discharge of both trains of the safety injection pumps, opened as required. The licensee has taken interim measures, including augmented surveillance, to assure that the valves are operable. The licensee also is considering two alternative long-term solutions. The first alternative is to order new replacement valves; the second alter native is to modify the system by adding new dedicated feedwater pumps and making the safety injection system completely independent of the feedwater system.

The licensee has decided to pursue the second alternative. Both the current and proposed modified systems are shown in the enclosed handouts (Enclosure 2).

The licensee intends to make a f'Ormal submittal documenting the proposed modification.

Original signed by Walter A. Paulson, Project Manager Operating Reactors Branch #5 Division of Licensing

Enclosures:

oo I As stated cc w/enclosures:

See next page 8209230030 820913 PDR ADOCK 05000206 P

PDR OFFICE)

SURNAME) v..................

DATE...*..

• 2._......

...........I............

NRC FORM 318 (10-80) NRCM 0240 OFFICIAL RECORD COPY USGPO: 1981-335-960

.Mr. R. Dietch September 13, 1982 cc Charles R. Kocher, Assistant General Counsel James Beoletto, Esquire Southern California Edison Company Post Office Box 800 Rosemead, California 91770 David.R. Pigott Orrick, Herrington & Sutcliffe 600 Montgomery Street San Francisco, California 94111 Harry B. Stoehr San Diego Gas & Electric Company P. 0. Box 1831 San Diego, California 92112 Resident Inspector/San Onofre NPS c/o U. S. NRC P. 0. Box 4329 San Clemente, California 92672 Mayor City of San Clemente San Clemente, California 92672 Chairman Board of Supervisors County of San Diego San.Diego, California 92101 California Department of Health ATTN:

Chief, Environmental Radiation Control Unit Radiological Health Section 714.P Street, Room 498 Sacramento, California 95814 U. S. Environmental Protection Agency Region IX Office ATTN:

Regional Radiation Representative 215 Freemont Street San Francisco, California 94111 Robert H. Engelken,.Regional Administrator Nuclear Regulatory Commission, Region V 1450 Maria Lane Walnut Creek, California 94596

ENCLOSURE 1 LIST OF ATTENDEES NAME AFFILIATION F. Miraglia NRC W. Paulson NRC D. Crutchfield NRC K. Baskin SCE G. Hammond SCE G. Holahan NRC D. Pickett NRC

ENCLOSURE 2 0

0 SAFETY INJECTION SYSTEM SAN ONOFRE NUCLEAR GENERATING STATION UNIT 1 SI PUMPS DEDICATION/NEW FEEDWATER PUMPS DESIGN ALTERNATIVE NRC PRESENTATION September 8. 1982

OBJECTIVE OF REDESIGN:

Minimize Reliance on Valve Operation o

Eliminate Valve/Pump Sequencing o

Utilize Normal Open Valves o

Minimize Impact on Remainder of SIS

CONSIDERED ALTERNATIVES:

o Dedicated SIS/New Feedwater Pumps o

New HPSI and LPSI Systems o

New SI Pumps

PRM. CONPPUMPS 70 STFAM GENc-RATIRS pwsr C

vOT/MN H7SA 36 c

trly Ev I5A4 Ia

-2 0

114 NV3 r

57 1oop cA COLV tk 515/LSY 7Z7

FRM. COND, PUMPS 70 STEAM GENERA70S RWS T

,O1N7AAVArP.J IEW FEED 854A PuMP A

852A RET/RED P/PING I 5/S CONN

_CO I

(rYR6 I

-IS/S I

/9 SW1A85/A

-AW DED/CATED SI PUMP A t

"C SI PUMPS (Ex/sr FEEDWATER PUMP G -3A)

Co FRM. CONO. PUMPS 70 57M. GEWEA70RS PUMP B a9 8.58 808 I r/

SASS CO1DPUEP S/S J

I (C-K1$,K"-DVArER

-PUMP G-38)

(NCTW DE D/CA TED FD PPMMPS)

DEDICATED SIS/NEW FEEDWATER PUMPS ADVANTAGES:

o Allows Dedication of Existing SIS o

Valve/Pump Sequencing Eliminated o

Valves Maintained in Normal Open Position o

Major Modifications are Non-Safety Related

NEW SYSTEM OPERATION:

o Minimum Equipment Operation Start Booster Pumps Start SIS Pumps Open MOV's o

Safety Analysis Unaffected

MAJOR EQUIPMENT REQUIREMENTS:

o New Feedwater Pumps o

New Power Supply o

New Switchgear

U tr~t, ~ New Feedwater P e (est)pup an CI~~l~t~g DL~.cc SA~ 4/0 C

C84I NewwFeedwater Met too Pupt(est NEW EQUI PfPTLCAIN compart Ism toptoeat es sor ver 10 a

ftUtuds WACe s rucre D ct n PRIMARY PLAWAff 4At*P WbAltt SfutAd@O MA DI3stAN AAfr

'nfre SEAWALL N ~

~

~

~

~

~

~

t eas W

westPMEN CAT1

PROJECT INTEGRATION.

o SEP Topics o

Appendix R

19 82 1 9 83 1 9 84 198 D96 J FM A M J J A S 0 ND J FM AM J J AS 0 ND J FM AM J J AS 0 ND J F MA M J J A S 0 ND F MAM J C Y CLE 8 C Y CLE 9

-C Y CLE 10 1t e

L Normal Operation EVENTS Seismic Upgrade-

-Normal Operation SRefueEPn MdOtii

& Integrated Assess-FSEP Modifications ment Feed Pumps OUTAGES SIS VALVES AI Valve Delivery NEW FEEDWATER rn PUMPS Theoretical turrent Implementation Schedule INTEGRAT E D SCHEDULE

CONCLUSIONS:

o SIS Redesign is Long Term Solution to Valve Failures o

Current System Functionally Acceptable (Complete redesign/upgrade not necessary) o No Major Issues Unresolved