ML19341A034

LER 80-077/03L-0:on 801224,one Bearing Water Makeup Pump Removed from Svc During Normal Operation.Caused by Need to Repair Valve Leak.Valves Repaired & Pump Returned to Svc

ML19341A034
Person / Time
Site:	Fort Saint Vrain
Issue date:	01/14/1981
From:	Gahm J PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19341A030	List: ML19341A029 ML19341A034
References
LER-80-077-03L, LER-80-77-3L, NUDOCS 8101210488
Download: ML19341A034 (3)

Text

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60 61 DOCK ET NUM8 E R 69 EVENT O ATE 74 75 RE80RT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h lol2l ] During normal operation, one bearing water makeup pump was removed f rom service to i l o l a i l repair a valve. The valve leak had not rendered the oumo inocerable. Operation at i lolAl l power with one bearing water makeup pump inocerable constitutes operation in a de- 1 I o I s i l graded mode of LCO 4.2.2 and is reportable per Fort St. Vrain Technical Specification l ~

f a 16 i LAC 7.5.2(b)2. There was no effect on public health or safeev. Redund ant ecutoment I l o l 7 l l was available and operable. A similar event was reported as Rn 79-26. I I )la I I ,._)

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t i t a i ] The cause of this event was the removal from service of one bearine water makeuo l li ii i ! pump while the reactor was at power. The eumo was returned to service af ter the 1 i , i ; , l valve tepair was complete. The valve is a carbon stael,150 pound, 3 inch, gate l

,,,3l l valve, Model 5202WE, manufactured bv Walworth. l l

Ll Lt.) I 80 7 8 9 ST$N  % POWER CTHER STATUS $15 RY CISCOVERY OESCRIPTicN l lt i s l W@ l 0 l 7 l 0 52[@luN/A l l A l@l Observed by Operator l 44 as se a0 l

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NAME OP PREPARER PHONE: 303 785-2224 .

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REPORT DATE: January 14, 1981 REPORTABLE OCCURRENCE 80-077 ISSUE O OCCURRENCE DATE: December 24, 1980 Page 1 of 2 FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO 16805 WEID COUNTY ROAD 19 1/2 PLATTEVILLE, COLORADO 80651 REPORT NO. 50-267/80-077/03-L-0 Final IDENTIFICATION OF OCCURRENCE:

One bearing water makeup pump was removed from service to repair a leaking valve bonnet. This situation constitutes operation in a degraded mode of LCO 4.2.2 and is reportable per Fort St. Vrain Technical Specification AC 7.5.2(b)2.

EVENT DESCRIPTION:

On December 24, 1980, while operating at 70% thermal power and 215 MW elec-trical, a valve in the suction path of one of the two bearing water makeup pumps developed a bonnet leak, which did not, in itself, render the pump inoperable. Later the same day, it was decided to remove the pump from service to repair the valve leak.

The bearing water makeup gump was out of service from 0930 hours0.0108 days <br />0.258 hours <br />0.00154 weeks <br />3.53865e-4 months <br /> until 1030 hours0.0119 days <br />0.286 hours <br />0.0017 weeks <br />3.91915e-4 months <br /> on Decemtr 24, 1980.

CAUSE DESCRIPTION:

The cause of this event was the removal from service of the bearing water makeup pump while the reactor was at power.

CORRECTIVE ACTION:

Upon completion of the valve repair, the pump was returned to service.

No further corrective action is anticipated or required.

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REPORTABLE OCCURRENCE 80-077 ISSUE O Page 2 of 2 Prepared By: 8 [ , M Richard R. Frost Technical Services Technician Reviewed By:

. W f. ahm Tectinical Serivces Supervisor Reviewed By:

Frank M. Mathie Operations Manager Approved By: Fmj l Don Warembourg g Manager, Nuclear Production l

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