ML20069F685

RO 099:on 820913,both Trains of Control Room Emergency Air Cleanup (Creacus) Failed to Start in Mode 2.Train a Failure Caused by Incorrectly Positioned Kirk Key on Breaker 2A0615 of Emergency Air Conditioning Unit E-418

ML20069F685
Person / Time
Site:	San Onofre
Issue date:	09/14/1982
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
RO-099, RO-99, NUDOCS 8209280202
Download: ML20069F685 (2)

Text

O Southern California Edison Company e

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September 14, 1982 U. S. tJuclear Regulatory Commission Office of inspectlon and Enforcment Region V 1450 Maria Lane, Suite 210 Walnut Creek, California 94596-5368 Attention: Mr. R. H. Engelken, Regional Administrator

Subject:

Docket tjo. 50-361 Prompt Report Licensee Event Report tJo.099 San Onofre tJuclear Generating Station, Unit 2 Pursuant to Technical Specification 6.9.1.12b to Operating License tJPF-10 for San Onof re Unit 2, this letter confirms our September 13, 1982, pr ompt notification to the tJRC of a reportable occurrence involving Limiting Condition for Operations (LCO's) 3.7.5 and 3.0.3 on the Control Room Emergency Air Cleanup System (CREACUS).

On September 13, 1982 at 1230 while in Mode 2 both trains of CREACUS failed to start. Initial investigation revealed that Train A failed to start because the kirk key on breaker 2A0615 of emergency air-conditioning unit E-418 was positioned halfway toward its normally closed position, consequently Train A could not be energized. Operability of the Train was established by repositioning the kirk key in the breaker to its locked closed position at 1302. Investigation into the cause of the failure of Train B is continuing. The initial review indicator that the damper 2itV9703 associated with air-conditioning unit E-419, was interlocked such that i t prevented the f an f rom starting. The Train was restored to operable status at 1350.

0209280202 020914

,PDR ADOCK 05000361 PDR 62-33o

R. H. Engelken September 14, 1982 A 14-day Report and LER 82-99 will be provided to complete our reporting requirements and to describe the cause and corrective measures taken by September 27, 1982.

If there are any questions, please contact me.

Sincerely, HSPty/Olkrk cc: A. E. Chaf fee (USNRC Resident inspector, San Onofre Unit 2)