ML19316A417

RO 269/78-01:on 780203,field Flashing Breaker Failed to Close.Controls Checked & Found in Proper Condition.Breaker Checked & Cleaned.Cause of Failure Not Determined

ML19316A417
Person / Time
Site:	Oconee
Issue date:	02/03/1978
From:	DUKE POWER CO.
To:
Shared Package
ML19316A413	List: ML19316A412 ML19316A417 ML19316A420
References
RO-269-78-01, RO-269-78-1, NUDOCS 7912110673
Download: ML19316A417 (1)

Text

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, DUFE POWER COMPANY OCONEE UNITS 1,2,3 ep Report No.: RO-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 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 Keowee Hydro Unit 2 from the Oconee control room, the field flashing breaker failed to close as 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 the problem in the field flashing breaker.

Apoarent Cause of Occurrence:

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 undetermined.

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 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.

This incident is similar to a December 19, 1977 incident described in RO-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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