05000220/LER-1979-023-03, /03L-0:on 791004,cooling Water Pump of Diesel Generator 103 Tripped.Caused by Burned Contacts in Breaker. Breaker Repaired & Pump Started Manually.Preventative Maint Procedure Will Be Revised

/03L-0:on 791004,cooling Water Pump of Diesel Generator 103 Tripped.Caused by Burned Contacts in Breaker. Breaker Repaired & Pump Started Manually.Preventative Maint Procedure Will Be Revised

ML18037A207
Person / Time
Site:	Nine Mile Point
Issue date:	11/02/1979
From:	Duda E NIAGARA MOHAWK POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML17053B179	List: 05000220/LER-1979-023, Forwards LER 79-023/03L-0 05000220/LER-1979-023-03, /03L-0:on 791004,cooling Water Pump of Diesel Generator 103 Tripped.Caused by Burned Contacts in Breaker. Breaker Repaired & Pump Started Manually.Preventative Maint Procedure Will Be Revised
References
LER-79-023-03L, LER-79-23-3L, NUDOCS 7911130338
Download: ML18037A207 (4)

LER-1979-023, /03L-0:on 791004,cooling Water Pump of Diesel Generator 103 Tripped.Caused by Burned Contacts in Breaker. Breaker Repaired & Pump Started Manually.Preventative Maint Procedure Will Be Revised

Event date:
Report date:
2201979023R03 - NRC Website

text

NRC FORM 366

'(7.77}

U. S. NUCLEAR REGULATORY COMMISSION

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~04 bl03 Diesel Generator, the associated coolin water um tri ed due to breaker mal function.

Before the breaker was manuall closed and coolin water um restarted the enerator cool in water inlet tern er-

~OS ature increased to 210OF.

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~O7 heat dama e but none was found.

The cool in water um brea er wa in-s ected and the contacts wer e found to be burned and an au

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SYSTEM

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~0 21 22 23 24 26 27 28 29 30 31 32 ACTION.FUTURE EFFECT SHUTDOWN ATTACHMENT NPRDQ 'RIMECOMP.

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Diesel Generator 103 coolin water um tri was caused b

breaker mal-function.

The contacts in the breaker were found to be burned and a

.auxiliary contact was found stuck in the o en osition.

The breaker was repaired and the pump was manually started to test o erabilit

. The 4

cooling water pump breaker preventative maintenance rocedure will be 7

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FACILITY

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NRC FORM 366 (7.77)

CONTINUED PAGE 2

LER 79-23 ~

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~02 tact was found stuck in the o en osition.

The breaker was re aired

~03 0

4 and the pump was restarted manually to check its operation.

The Diesel Generator Operability Test was subsequently performed and successfull

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~06 completed.

This event had minimal safety implications due to the re-dundancy of the system.

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8 REVISION LJ COMPONENT MANUFACTURER 44 47 SYSTEih'I

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 0

revi sed to incorporate a separate operabi 1 ity test of the cool ing water OE.

pump prior to performing the entire diesel generator operability test.

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9 FACILITY STATUS

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Q25~ Q25 7

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10 11 44 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION Q30 zz ~QuS 7

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