ML20090L109

Interim Const Deficiency Rept Re Failure of GE AKR-30 Circuit Breakers.Initially Reported on 831223.All Screws on G Switch Torqued to 6 Inch/Lbs & Requirement to Check Switch Tightness Added to GE Reinsp Program.Next Rept by 840915

ML20090L109
Person / Time
Site:	Hope Creek
Issue date:	05/14/1984
From:	Martin T Public Service Enterprise Group
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
NUDOCS 8405250061
Download: ML20090L109 (2)

Text

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Thomas J. Martin Public Service Electric and Gas Company 80 Park Plaza Newark N.J. 07101 201/430-8316 Vice President Engineering and Construct!on May 24, 1984 Dr. Thomas E. Murley, Administrator U. S. Nuclear Regulatory Commission kbg) " b Office of Inspection and Enforcement Region I 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Dr. Murley:

CONSTRUCTION DEFICIENCY GE TYPE AKR-30 CIRCUIT BREAKERS HOPE CREEK GENERATING STATION On December 23, 1983, a verbal report was made to Region I, Office of Inspection and Enforcement representative, Mr. W.

Cook, advising of a potentially significant construction deficiency concerning the failure of several General Electric AKR-30 circuit breakers to operate properly. On January 18, and February 24, 1984, interim reports were sent to your office. The following information is provided in accordance with 10CFR50.55(e).

During General Electric's reinspection of the Hope Creek AKR-30 circuit breakers at their Farmington, Connecticut facility, one additional fabrication deficiency has been identified. Circuit Breaker Serial No. N2919300026 failed to operate after 59 electrical operations during a test for 70 consecutive operations. The failure was caused by a loose screw on the "G" switch. This switch coupletes the electrical circuit for the closing spring charging motor.

By way of corrective action, all screws on the "G" switch were torqued to 6 inch /lbs. This breaker then performed satisfactorily. General Electric has added the requirement to check the "G" switch screws for tightness to their reinspection program.

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_ Dr. T. .E. Murley 2 5/14/84 We_ expect to' provide a final report by September 15, 1984.

Very truly yours, T

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C Office of Inspection and Enforcement Division of Reactor Construction Inspection Washington, D. C. 20555 NRC Resident, Inspector - Hope Creek P. O. Box 241 Hancocks Bridge, NJ-08038 Records Center Institute of Nuclear Power Operations i 1100 Circle 75 Parkway,. Suite 1500 Atlanta, GA 30339 i

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