ML19259C245

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Responds to IE Bulletin 79-09 Re Failure of GE Type AK-2 Circuit Breakers in safety-related Sys.Breaker Used in Reactor Switch Gear
ML19259C245
Person / Time
Site: Calvert Cliffs  Constellation icon.png
Issue date: 05/05/1979
From: Lundvall A
BALTIMORE GAS & ELECTRIC CO.
To: Grier B
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
NUDOCS 7906140458
Download: ML19259C245 (2)


Text

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.g4 15R B ALTIMORE G AS AND ELECTRIC COMPANY P.O. BO X 147 5 D ALTIMOR E. M A RYL AND 21203 Antwun E. LUNOVALL,Jn.

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so-o May 5, 1979 Office of Inspection and Enforcement Docket Nos. 50-317 U.S. Nuclear Regulatory Commission 50-318 Region I 631 Park Avenue Kina of Prussia, Pennsylvania 19406 Attention: Mr. Boyce H. Grier, Director Gentlemen:

This letter is in reference to I.E. Bulletin 79-09, Failures of G.E.

Type AK-2 Circuit Breakers in Safety Related Systems.

Investication of all General Electric breaker equipment presently in use at Calvert Cliffs revealed that the AK-2A-25 type breaker is used in the Reactor Switch Gear of Units I and II. Our Electrical Engineer-ing Department has no plans for future installations of this type breaker in any systems at this olant.

Our present Preventive Maintenance Program provides for cleaning, maintenance, and operational checks of those breakers during each refueling outaae. Our present Preventive Maintenance Procedure, ner-formed by cualified personnel, incorporates the G.E. circuit breaker instruction manual procedure for maintenance and operational checks.

We are presently incorporating the G.E. Service Advice Letter No.175 (CPDD) 9.3 into our existing procedure to insure the recommended checks and maintenance are nerformed on the under voltage trip device and the breaker trip mechanism. We expect to have this procedure modification completed by June 30, 1979.

Should you have further questions regarding this matter, we would be pleased to discuss then with you.

/ '

Very truly you.rs. ,

> / / /

4. / _wd.

. E. Lun'dvall, Jr. [

2279 163 Vice President - Supply AEL/ RED /dds 7906140l/F9 I

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I.E. Bulletin No.79-09_ Page Two Copies To: J. A. Biddison, Esquire G. F. Trowbridge, Esquire E. L. Conner, Jr., NRC J. W. Brothers, Bechtel Office of Insoection and Enforcement U.S. Nuclear Regulatory Commission Washinoton, D.C. 20555 Attention: Director, Division of Reactor Construction Inspection 2279 164

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