05000259/LER-1980-084-03, /03L-0:on 801112,alternate Feeder Breaker 1930 Failed to Close.Caused by Lack of Contact Between Fuse Clip & Breaker Fuse & Dirty Auxiliary Contacts.Fuse Clip Adjusted & Contacts Cleaned

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/03L-0:on 801112,alternate Feeder Breaker 1930 Failed to Close.Caused by Lack of Contact Between Fuse Clip & Breaker Fuse & Dirty Auxiliary Contacts.Fuse Clip Adjusted & Contacts Cleaned
ML19345D333
Person / Time
Site: Browns Ferry Tennessee Valley Authority icon.png
Issue date: 12/09/1980
From:
TENNESSEE VALLEY AUTHORITY
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345D329 List:
References
LER-80-084-03L, LER-80-84-3L, NUDOCS 8012120514
Download: ML19345D333 (2)


LER-1980-084, /03L-0:on 801112,alternate Feeder Breaker 1930 Failed to Close.Caused by Lack of Contact Between Fuse Clip & Breaker Fuse & Dirty Auxiliary Contacts.Fuse Clip Adjusted & Contacts Cleaned
Event date:
Report date:
2591980084R03 - NRC Website

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EVtNT OFSCRIPTION AfdO PHOB ABLE CONSEQUENCES h l o 121 l_During a planned Athens line outage which de-energized the cooling tower trans former, i o i 3, l alternate feeder breaker 1930 failed to close, de-energizing 4 KV bus tie board during lni,,j [ automatic transfer of normal feeder breaker 1920. When cooling tower transformer was I

1.0 i s J l re-tiergized normal feeder breaker failed to reclose. Required redundant equipment was g g l available and proven operable per Tech. Spec. No danger to health or safety of public.

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Tennessee Valley Authority Fona DF-17 Browns Ferry Nuclear Plant BF 15.2 1/10/79 LER SUPPLEMENTAL INFORMATION BFRO 259 / 80084 Technical Specification Involved 3.9.A & 3.9.A.4(b)

Reported Under Technical Specification 6.7.2.b(2)

Date of Occurrence 11/12/80 Time of Occurrence 0527 Unit 1, 2, & 3 Identification and Dese.iotion of Occurrence:

During a planned Athens line outage which de-energized the cooling tower transformer, alternate feeder breaker 1930 failed to close, de-energizing 4 KV bus tie board during automatic transfer of normal feeder breaker 1920. When cooling toyer transformer was re-energized normal feeder breaker failed to reclose., Required redundant equipment was available and proven operable per technical specification.

Conditions Prior to Occurrence:

Unit 1 @ 99 Unit 20 0; refueling outage Unit 3 d 87:

Action specified in the Technical Specification Surveillance Requirements met due to inoperabic equipment. Describe.

Diesel genuators verified operable per technical specification 4.9.B.l.

Apparent Cause of Occurrence:

Fuse clip and fuse in close circuit of breaker 1930 was not making contact. Auxill:ry contacts of breaker 1920 were dirty.

Analvsis of Occurrence:

There was no damage to plant equipment. There was no activity release, no personnel exposure or injury and no danger to the health or safety of the public.

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Corrective Action

Fuse clip was adjusted and auxiliary contacts were cleaned. The bus tie board was energized. Maintenance procedure EMI-7 provides for cleaning auxiliary cpntacts and will be revised to check fuse clip tension.

Failure Data:

NA

  • Retention:

eriod - Lifetime; Responsibility - Administrative Supervisor

  • Revision: