ML13308B512
| ML13308B512 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 03/08/1973 |
| From: | Coe R SOUTHERN CALIFORNIA EDISON CO. |
| To: | US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 8103060680 | |
| Download: ML13308B512 (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 VICE PRESIoET 213-572-2278 March 8, 1973 Deputy Director for Reactor Projects Directorate of Licensing U. S..Atomic Energy Commission 1717 "H" Street N. W.
Washington, D. C.
20545 Docket Number 50-206 San Onofre Unit 1 No. 2 Diesel Generator
Dear Sir:
This report describes an incident experienced at San Onofre Nuclear Generating Station concerning No. 2 diesel-generator.
The No. 2 diesel-generator was returned to service on February 13, 1973, following maintenance on the engine-generator coupling. During the load test to demonstrate operability, the diesel engine tripped from high temperature.
During the following two days the diesel-generator was operated at various loads to determine the nature of the problem. This test program led to an inspection of the two cylinder bank cooling water thermostats.
The diesel is a. V-12 with one thermostat controlling cooling water to a bank of six cylinders.
The thermostats are a piston type and both were found to be sticking in their guide housings. Repairs consisted of lightly polishing the pistons and guides to remove minor deposits.
These thermostats will be inspected and maintained on a regularly scheduled basis in the future.
The diesel-generator was subsequently test operated at its rated load of 600 KW for one hour without the cooling water temperature exceeding 185 0F.
REGULATORY IMlAIL SECTION1 DOCKE CLER 17;26
Deputy Director for Reactor Projects Page 2 In accordance with Technical Specification requirements, No. 1 diesel-generator remained operable during the period the. No. 2 diesel-generator was out of service.
Sincerely, R. N. COE cc:
Director, Region V Regulatory Operations Office