ML20085M314
| ML20085M314 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 01/03/1974 |
| From: | Eric Thomas TENNESSEE VALLEY AUTHORITY |
| To: | Oleary J US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| AO-BFAO-7350W, NUDOCS 8311080192 | |
| Download: ML20085M314 (2) | |
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JAN7 jgg > y Mr. John F. O' Leary, Director 1,
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Directorate of Licensing Office of Regulation U.S. Atomic Energy Co::: mission 2.. '
Washington, DC 20545
Dear Mr. C' Leary:
f TENUESSEE VALLEY AUTHORITY - BROWS FERRY UUCLEAR PLANT UNIT 1 -
DOCKET NO. 50-259 - FACILITY OPERATING LICENSE DPR ABNOR!%L OCCURRENCE REPORT BFAO-7350W The enclosed report is to provide details concerning start circuit failure on standby emergency diesel generator which occurred on Browns Ferry nuclear Plant unit 1 on December 28, 1973, and is submitted in accordance with Appendix A to Regulatory Guide 1.16, i
Revision 1, October 1973.
Very truly yours, it.ammSEE VALLEY AUTHORITY I
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.-F Thomas.
N irector of Power Production Enclosure CC (Enclosure):
Mr. Norman C. Poseley, Director Region II Regulatory Operations Office, USAEC 230 Peachtree street, NW.
Atlanta, Georgia 30303
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1 ABNORMAL OCCURRENCE REPORT Report No.--BFAO-735W Report Date--January 3,1974 Occurrence Date--Dece=ber 28, 1973 Facility--Browns Ferry Nuclear Plant unit 1 '
Identification of Occurrence Start circuit failure on standby emergency diesel genera, tor.
Conditions Prior to Occurrence The reactor was in the hot standby condition.
Description of Occurrence During scheduled maintenance testing of the diesel generators, diesel generator C failed to start. One of the two start circuits had been disabled intentionany to permit testing of the redundant start circuit.
.The diesel failed to start when the redundant start circuit was tested.
Designation of Attarent Cause of Occurrence
- A loose terminal connection was found in start circuit No. 1.
This loose connection would have prevented start circuit No. 1 from functioning if automatica14 required upon failure of start circuit No. 2.
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Analysis of Occurrence Failure of one redundant start circuit would not have prevented diesel generator C from starting.
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Corrective Action i
j The loose connection was imediately reterminated and functional testing i
proved the start circuits operable. Following the occurrence, all terminal connections in the general location of the loose connection were checked for tightness on each diesel generator. No other loose connections were found.
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