ML20071E694

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Responds to IE Bulletin 83-01, Failure of Reactor Trip Breakers (Westinghouse DB-50) to Open on Automatic Trip Signal. Westinghouse Model DB-50 Reactor Trip Circuit Breakers Not Installed at Facilities
ML20071E694
Person / Time
Site: San Onofre  Southern California Edison icon.png
Issue date: 03/08/1983
From: Dietch R
SOUTHERN CALIFORNIA EDISON CO.
To: Engelken R
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
REF-SSINS-6820 IEB-83-01, IEB-83-1, NUDOCS 8303100346
Download: ML20071E694 (2)


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Southern Calibrnia Edison Company g R O. BOX 800 2244 WALNUT GROVE AVENUE ROSERT DIETCH ROSEMEAD, CALWORNIA 91770 TELEPHONC

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March 8, 1983 U. S. Nuclear Regulatory Commission Office of Inspection and Enforcemert 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 San Onofre Nuclear Generating Station Units 2 and 3 As requested, this letter provides our response for San Onofre Units 2 and 3 to IE Bulletin No. 83-01: Failure of Reactor Trip Breakers

. (Westinghouse DB-50) to Open on Automatic Trip signal.

Westinghouse Model No. DB-50 reactor trip circuit breakers are not installed at San Onofre Units 2 and 3. General Electric Model No. AK-2-25 reactor trip circuit breakers are used which are configured such that either the automatic or manual trip signal will actuate both the undervoltage and shunt relays. Thus, diversity and redundancy are provided within each AK-2-25 circuit breaker. In addition, preventative maintenance is performed in accordance with Item 3 of IE Bulletin 79-09: Failures of GE Type AK-2 Circuit Breakers in Safety Related Systems, to assure breaker design performance. The startup preventative maintenance program was reviewed and accepted by the NRC as documented in NRC Inspection Report No. 50-361/81-07,and the station preventative maintenance program has been reviewed and revised to be 8303100346 830308 PDR ADOCK 05000361 G PDR

9 Mr. R. H. Engelken March 8, 1983 identical to the startup program in the areas identified in Item 3 of IE Bulletin 79-09. Therefore, San Onofre Units 2 and 3 are not affected by IE Bulletin 83-01.

Subscribed on this day of gm , 1983.

Respectfully submitted, SOUTHERN CALIFORNIA EDISON COMPANY By:

R63ert Dietch Vice President Subscribed and sworn to before me this

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