05000312/LER-1979-024, Forwards LER 79-024/03L-0

Forwards LER 79-024/03L-0

ML20125E266
Person / Time
Site:	Rancho Seco
Issue date:	01/25/1980
From:	Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20125E268	List: 05000312/LER-1979-024, Forwards LER 79-024/03L-0
References
NUDOCS 8002050460
Download: ML20125E266 (2)

LER-2079-024, Forwards LER 79-024/03L-0

Event date:
Report date:
3122079024R00 - NRC Website

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t, At at *.q '.$0 t,'i '.,CIPAL UTILI TY C!sTRCT : EMI 5 Street, San 1M 20 Sacramento, Cahfc,rnia 95813, (916) 452 3211 January 25, 1980 m .

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~ I Region V Office of Invec: ion & Enf orcen.mt U. S. Nuc lea r :legulat o re Cr: Ission 1990 :: orth Cali:ornia Lule card

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- l n u t Creek, Californ.a 94396 Re: Operatiop 1.icense DPR-54 Docket No. 50-312 Reportable Cccurrence 79-24

Dear !ir. Engelken:

In accordance wLth Technical Specificatiens for Rancho Seco Nuclear Generating Station. Section 6.9.4.2c and Regulater" Guide 1.16, Revision 4, Section C.2.b(3), the Sacrarento ':unicipal Utility District is hereby sub-mitting, a thirt y-day repert of Reportable Occurrence 79-24 Normally, the croling water for lube oil coolers on both High Pressure Inj ecticn pumps. P-2 39A and B, and the 'take-Up Purp, P-236, is supplied f rom the Component Cool in7 '.?at er Sys tem. During an SFAS initiation, the coolinp, water is supplied by the Nuclear Service Raw Water Systems. The lube oil coolers,as well as the asseciated room coolers, are supplied as follows:

1. A IIP 1 (P-23PA) - f rom the "A" NSRW Synte n 1

2. B llP! (P-238B) - f rom the "B" NSR'/ system i

3. Make-Up Purp (P-236) from either the "A" or "B" NSRW System.

(Since the ",ake-l'p Pumo can be utilized as either the "A" ,r ,

"B" IIPI - " .? , its associated equipment cenling water supply,  !

similar ta its electrical supply, is available from either the j "A" or "B" system.)

Originally, the Iceked valve list, SP 214.03, had the valves to the Make-Up Puv Ceo!e'- (ell and reon) from the "A" NS"" syntem locked open and these : ren the "n" N s "' lecked closed. This was in keeping with the same philece" as havin" the suet !cn and discharge crosstie calves between P-238A and P-2 b lom.cd e,en and those "alves eetween P-2 39B snd P-236 locked clond.

These valve resitten c m i <' .s e ch aced, denendin- uyn the mode of oneration of l I

the "l' n um (i: utiliced as an r!P I pur ' . due to one bein". removed for mainte-nance, the coelin ' It er au" 31) valves could be repositioned to assure cot'lete redundan 'c).

Due to chang.e in fire orotectien redificat!ons per Anendment No. 19, a letter (.I. J. ':attiree t o '! . P. Heid) dated Aur.ust 28, 1978, discussed l

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e I'n c 1 k s n Page 2 January 25, 1980 isolatin ; the ':.U. runs coolers f rom both ';SRW systems durin;; normal operation.

On l:. m.r i n- t:, ce tiw 7erio6 s e n au i PI pum: 3 was out of service and the ".U.

punp ,ca, al'"d in ac thac articular !F'; pump would the appropriate SSRW system te .m i . -i in to sun,1. coellne. water. This rode of operation received Commission concurrence in a lette (~. '. Meid to J. J. ."attiroe) dated December 14, 1978.

A revision to the loded val"e list , SP 214.03, was made to reflect the chan ;e.

llowe ve r , the operatinn p acedure which is used to place the M.U. pump into an SFAS standby for an ilPI pump was not revised.

l On Decenber 17, 1979, the I!ich Pressure Injection Pump, P-238B, was '

removed fror service to facilitate fire protcction =cdifications per Amendnent l No. 19. The "ake-1l, Pu~ P-23S .cas valved in as the "3" liigh Pressure Injection pump. This configuratinn cas believed to meet the Technical Specification Section 3.2.1 requirerent for centinued reactor operation. On January 9, 1980, it was discovered that neither SSRW supplies had been valved in to provide l cooling water flow to the associated lube oil or roen cooler. Since the l normal lube oil cooler uater supply (CCW) was in service, there were no adverse I effects on the punn. iicwever, since SEAS cooling water supply was not available  ;

to either the lube oil ecoler or the room cooler, the ability for the pump to perform its safety-related function was compromised. Upon discovery, the "B" l lii;;h Pressure Injection purr was returned to service and placed in SFAS standby.  !

Procedural changes are being initiated to the applicable operating p rocedure (s) . The revisions will be completed prior to return to power.

There were no plant transients nor power reductions associated with this event.

Respectfully submitted,

,U . E' Lad---A J.'3. Mattinoe Assistant General Manager and Chief Engineer JJ'I:lill: j im cs: Director, MIPC (3)

Director, I&E (30) h oo- Pp h) g [ 9h inp M b AU Ob

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