ML13308B511
| ML13308B511 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 03/12/1973 |
| From: | Coe R SOUTHERN CALIFORNIA EDISON CO. |
| To: | US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 8103060676 | |
| Download: ML13308B511 (2) | |
Text
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Southern California Edison Company P. 0. BOX 800 2244 WALNUT GROVE AVENUE ROBERT N. COE ROSEMEAD, CALIFORNIA 91770 TELEPHONE March 12, 1973 s1-57-227e Deputy Director for Reactor Projects Directorate of Licensing U. S. Atomic Energy Commission 1717 "H" Street N. W.
Washington, D. C.
20545 Docket No. 50-206 San Onofre Unit 1 No. 1 Diesel-Generator
Dear Sir:
This report describes an incident experienced at San Onofre Nuclear Generating Station concerning No. 1 diesel-generator.
At 1:30 p.m. on February 16, 1973, the No. 1 diesel generator was removed from service for an inspection of the cooling water thermostats. At the completion of the inspection and during the routine test procedures, for return to service after maintenance, an unusual amount of smoke was observed coming from the No. 1 diesel-generator exhaust. The diesel was removed from service and an investigation initiated to determine the cause. An inspection revealed-that the west fuel injection pump on the diesel, which supplies fuel to the north cylinder bank, had a broken shaft. The diesel is a V-12 with one fuel injection pump supplying a bank of six cylinders. Theinjection.pump was removed and sent off site for evaluation and repair.
Preliminary inspections did not reveal any reason for the failure. An independent metallurgist's evaluation of the broken shaft will be made in an effort to determine the cause of failure and the results will be available for inspection at San Onofre. The remaining fuelinjection pump shaft was magna fluxed as a precautionary measure. A small crack was discovered in this shaft.
It is-our intention to inspect the shafts for the injection pumps of No-2 diesel-generator.
MAR281973 W REGULATORY UMLSECT10N 0OCT CLERK
Deputy Director for Reactor Projects Page 2 Both injection pump shafts were replaced and the diesel generator returned to service.
In accordance with Technical Specification requirements, No. 2 diesel-generator remained operable during the time the No. 1 diesel-generator was out of service.
Sincerely, ROBERT N. COE cc:
Director, Region V Regulatory Operations Office