ML20072F347

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Provides 10-day Response to IE Bulletin 83-04, Failure of Undervoltage Trip Function of Reactor Trip Breakers. on 830301,three Breakers in Unit 2 Failed to Open.On 830308,one Breaker in Unit 3 Failed to Open.Investigation Continuing
ML20072F347
Person / Time
Site: San Onofre  Southern California Edison icon.png
Issue date: 03/22/1983
From: Baskin K
SOUTHERN CALIFORNIA EDISON CO.
To: Engelken R
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
IEB-83-04, IEB-83-4, NUDOCS 8303240016
Download: ML20072F347 (2)


Text

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f Southern California Edison Company h5 P. O. B OX 8 00 2 2 44 W ALN UT GROVE AVENUE ROSEMEAD. CALIFORNI A 91770 K. P. B A S KIN March 22, 1983 rEto o~E MAN AGE R OF NUCLE AR ENQiNEE RING, (213),72-1401 SAFETY. AND LICENSING U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region V 1450 Maria Lane, Suite 210 Walnut Creek, California 94596-5368 Attention: Mr. R. H. Engelken, Regional Administrator

Dear Sir:

Subject:

Docket Nos. 50-361 and 50-362 Response to IE Bulletin No. 83-04 San Onofre Nuclear Generating Station, Units 2 and 3

Reference:

Letter, H. B. Ray (SCE) to R. H. Engelken (NRC),

Reply to Confirmatory Action Letter, dated March 22, 1983 This letter provides our 10 day response for San Onofre Units 2 and 3 to IE Bulletin No. 83-04: Failure of the Undervoltage Trip Function of Reactor Trip Breakers.

As documented in our Licensee Event Reports, Nos.83-019 (Unit 2) and 83-023 (Unit 3), during surveillance testing on March 1, 1983 and March 8, 1983, three General Electric Type AK-2-25 reactor trip breakers in Unit 2 and one breaker in Unit 3 failed to open when the undervoltage trip device was tested independent of the shunt trip device.

Our investigation and evaluation of the reactor trip circuit breakers are continuing. As indicated to you and members of your staff on March 18, 1983, the reporting of programmatic deficiencies identified by testing of the reactor trip circuit breakers will be provided by March 31, 1983. It is anticipated that this report will be ar. interim report. Once our investigation and evaluation of these deficiencies are concluded, a final response to IE Bulletin 83-04 will be made.

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8303240016 830322 PDR ADOCK 05000361 0 PDR L_

O Mr. R. H. Engelken In accordance with the reference, neither Unit 2 or 3 will enter Mode 2 until advised by your office that the matter involving the reactor trip breakers is resolved.

Subscribed on this dyad day of breI , 1983.

Respectfully submitted, SOUTHERN CALIFORNIA EDISON COMPANY By:

K. P. Baskin Manager of Nuclear Engineering, Safety, and Licensing Subscribed and sworn to before me this E4^ day of hit.u / 9f-3 .

, OFFICIAL SEAL hw Mu, < AGNES CRABTREE l Notary /Public' in and for the County of Los Ahgeles, State of California d.I "^" 'Q'C -

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E My Commission Expif es Aug. 27, 1986 l

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