ML20004C380

Revised LER 79-005/03X-1:on 790209,during Cold Shutdown, Diesel Generator 1A Output Circuit Breaker Did Not Close While Loss of Outside Electrical Power Test Was Performed. Caused by dried-out Breaker.Breaker Relubricated

ML20004C380
Person / Time
Site:	Fort Saint Vrain
Issue date:	04/09/1981
From:	Gahm J PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20004C379	List: ML20004C378 ML20004C380
References
LER-79-005-03X, LER-79-5-3X, NUDOCS 8106030301
Download: ML20004C380 (1)

Text

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'  ? 60 61 EVENT CESCRIPTION AND PROSABLE CONSEQUENCES h I o 121 l While the plant was in a shutdown condition and the semi-annual loss of outside I g g electrical power test was being performed, diesel generator lA output circuit breaker l io,,,g did not close. This is a degraded mode of LCO 4.6.1(3) and is reportable per Fort St.l g o , 3, g Vrain Technical Specification AC 7. 5.2(b)2. There was no affect on public health or l g g l safety. No accompanying occurrence. Redundant system available and operable. j plyl l Similar report RO 77-31. I I

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22 24 as :s . 2, 4o ai 42 u 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

li10l lone ITE Model K-1600 circuit breaker failed to close. Breaker renlaced with an ecut- I g l valent spare. The breaker was disassembled and insoected. The crease used S ne i Iil21 Ibreaker was found to have to dried out due to the high ambient temoerature. The I i,I21 I breaker was relubricated and returned to service. A =aintenance program was estab-  !

ii,4i i lished to disassemble and relubricate these breakers every six months.

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NAME OF PREPARER -

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