ML20085M341
| ML20085M341 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 01/04/1974 |
| From: | Eric Thomas TENNESSEE VALLEY AUTHORITY |
| To: | Oleary J US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20085M343 | List: |
| References | |
| AO-BFAO-7348W, NUDOCS 8311080265 | |
| Download: ML20085M341 (2) | |
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j TENNESSEE VALLEY AUTHOAITY iT^ li CHATTANOOGA, TENNESSEE 37401 L i
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Mr. John F. O'Learf, Director i, W, J,'erk Directorate of Licensing 7,
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Washinston, DC 20545
Dear Tr. O' Leary:
TENHESSEE'EALLEY AUTHORITI - 3:10WHS FERRY IR.TCLEAR PLANT UNIT 1 -
DOC:C:T UO. 50-259 - FACILITI OPZ3ATIUG LICEUSE DPR 1.3 HOR!'AL OCCUP. C CE REPORT 3FAO-734El The enclosed report is to provide details concerning HPCI failure i
which occurred on 3rouns Ferri Uuclear Plant unit 1 on December 25, 1973, and is submitted in cecordance with Appendix A to Regulatory
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Guide 1.16, Revision 1, October 1973.
l Very truly yours, i
TEiHESSEE VALLEY AUTHORITY I
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7 / / Cr E. F. Thomas Director of Power Production i
1 Enclosure CC (Enclosure):
Er, Narman C. Moseley, Director Region II Regulatory Operations Office, USAEC l
230 Peachtree Street,131.
Atlanta, GeorSia 30303 I
l g/ 6 REGULATORYLOPERATIONS
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ABNOR!@.L OCCURRENCE REPORT Report No.-BFAO-73h8W Report Date--January 4, 1974 Occurrence Date--December 25, 1973 Facility--Browns Ferry nuclear Plant unit 1 Identification of Occurrence HPCI failure.
Conditions Prior to Occurrence The unit was operating at 158o 1.st and 44o Ise.
Description of Occurrence At approxi= ate],y 11:00 p.m., the HPCI turbine failed to reach. rated speed and flow during routine surveillance testing. The control valve came open on initiation, but returned 4-ediately to the closed position.
Desienation of Antarent Cause of Occurrence A resistor was open in the Woodward unit which supplies the 48-volt de power to the EG-M governor control box. Therefore, the governor was unable to give the control valve a proper control signal.-
Analysis of Occurrence Safe shutdown of the reactor would have been possible because the re=aining emergency core cooling systems were-operable.
Corrective Action The resistor box was replaced and a surveillance test was performed to demonstrate operability.
The turbine performed satisfactorily.
Failure Data Resistor box, Woodward,-Part No. 8270-282.
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