ML19308B553

LER 78-029/03L-0;on 780105,Keowee Unit 2 Failed to Start. Caused by Generator Field Flashing Breaker Failure to Close. Breaker Verified Operable Subsequent Operation & Visual Examination

ML19308B553
Person / Time
Site:	Oconee
Issue date:	02/03/1978
From:	Ken Wilson DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19308B549	List: ML19308B548 ML19308B553
References
LER-78-029-03L-01, LER-78-29-3L-1, NUDOCS 8001090550
Download: ML19308B553 (2)

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EI from oconee control room. Since Keovee 2 is a source of auxiliary power g l o 141 i for tha Oconee station (Units 1,2, and 3) this is reportable under g to t sj l T.S. 6.6.2.1.b.(2). The unit started normally on second and subsequent ,

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gi,oil The Field Flashing Breaker (DB-26) on the generator failed to close on Ii t i i I first attemot. The breaker was verified as operable by subsequent  ;

mI ooeration and visual examination. Inspection and servicing ,

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DUKE POWER COMPANY OCONEE UNITS 1,2,3 Report No.: R0-269/78-1 Report Date: February'3, 1978 occurrence Date: January 5, 1978

-Facility: Oconee Units 1, 2 and 3, Seneca, South Carolina Identification of Occurrence: Keowee Hydro Unit 2, Field Flashing Breaker Inoperable i

Conditions Prior to Occurrence: Unit 1 100% FP Unit 2 Cold Shutdown Unit 3 100% FP Description of Occurrence: ,

On January 5 at 0628 during an attempt to start Keovee Hydro Unit 2 from the Oconee control room, the field flashing breaker failed to close as j

' required. A second attempt was made at 0636 at which time the breaker  ;

closed normally. Keowee Unit 2 was then shut down in order to determine l the problem in the field flashing breaker.  !

l Apoarent Cause of Occurrence:

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All controls were checked and found to be in proper condition. The breaker  ;

was checked and cleaned, but no abnormalities were found. The cause is I undetermined.

l Analysis of Occurrence:

Keowee Unit 2 is one of several redundant sources of auxiliary power for the Oconee station. Keowee Unit 1 and the underground feeder cable were fully i operational and capable of supplying emergency power to all units, if required.

The health and safety of the public were not endangered by this incident.

I This incident is similar to a December 19, 1977 incident described in R0-269/77-29, which was transmitted by our letter of January 18, 1978.

Corrective Action:

The breaker contacts were cleaned and its clearances were checked. The control circuits were also checked.

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