ML19316A409

LER 78-006/03L-0:on 780305,Keowee Hydro Unit 2 Failed to Start.Caused by Inoperable Field Flashing Breaker.Breaker Failed on Three Previous Occasions (ROs 269/77-29,269/78- 01 & 269/78-03).Cause Unknown & Under Investigation

ML19316A409
Person / Time
Site:	Oconee
Issue date:	04/07/1978
From:	Ken Wilson DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19316A401	List: ML19316A400 ML19316A404 ML19316A409
References
LER-78-006-03L, LER-78-6-3L, NUDOCS 7912110667
Download: ML19316A409 (1)

Text

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EVENT OE5calmCN ANO PRc8ASLE cCNSECUENcES h Io # 2I l At 1750 on February 22, 1978, dur2.ng normal operation, Oconee attempted to ,

,,,,,g start Keowee Hydro Unit 2 which is a source of auxiliary power for the Oconee

, ,, , , , g Nuclear Station. The unit failed to start due to an inoperable field flashing;

, ,, , , , g breaker. The unit was started without incident after an investigation had been

,,,jg completed. Keowee Unit I and other sources of auxiliary power for the station,

,,,,,; were available if needed so that no loss of emergency power was experienced.

, , , , Thus, public health and safety were not endangered.

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ti,oll The field flashine breaker has failed on 3 previous occasions. There has beeng

,,,,,g no determination of cause, as yet. Until the cause has been pinpointed, the

appropriate corrective action till be continued monitoring and investigation.

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