ML13308B505
| ML13308B505 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 01/22/1975 |
| From: | Fogarty D SOUTHERN CALIFORNIA EDISON CO. |
| To: | US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 8103060656 | |
| Download: ML13308B505 (2) | |
Text
Southern California Edison Company P. 0. SOX 800 2244 WALNUT GROVE AVENUE DAVID J. FOGARTY ROSEMEAD, CALIFORNIA 91770 TELEPHONE VICE CEEsioENT 213-572-2796 January 22, 1975 Deputy Director for Reactor Projects Directorate of Licensing Regulation U. S. Atomic Energy Commission Washington, D.C.
20545 Docket Number 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 the 01 3
No. 1 diesel-generator.
In accordance with Station Order S-0-19 which outlines the testing of auxiliary protective equipment, the two diesel-generators are tested weekly.
This test requires that both diesel-generators be run at a load of 200kw.
During the testing, conducted on January 14, 1975, the No. 1 diesel-generator was air started.
The operator in attendance during the starting operation noted that the air start motor did not stop after the diesel-generator had started.
Subsequently the No. 1 diesel-generator tripped on "Overcrank".
Investigation revealed that the pulley used to drive the diesel's auxiliary generator had separated from its drive shaft.
Due to the failure of the auxiliary generator, a signal was not provided to the diesel's starting circuitry to indicate the diesel-generator had started; thus, the air starting motor continued to operate until it timed out and tripped the diesel-generator on "Overcrank".
Repairs consisted of rewelding the pulley to its drive shaft.
The No. 1 diesel-generator was subsequently tested satisfactorily later in the day of January 14, 1975.
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-2 In accordance with Technical Specification requirements, the No. 2 diesel-generator remained operable during the period the No. 1 diesel-generator was out of service.
Addi tionally, the auxiliary generator drive pulley on the No. 2 diesel-generator was inspected and found in satisfactory condition.
Sincerely, cc:
Director, Region V Regulatory Operations Office