ML18219B552

D.C. Cook - Reporting Abnormal Occurrence Concerning Equipment Deficiency Identified as Diode Failures in Engineered Safeguards System Test Circulatory

ML18219B552
Person / Time
Site:	Cook
Issue date:	02/03/1975
From:	Dolan J American Electric Power Service Corp
To:	James Keppler Office of Nuclear Reactor Regulation
References
Download: ML18219B552 (4)

Text

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D.C. Cook facility....concerning a deficiency

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AMERICAN ELECTRIC POWER Service Corporation 2 BroadtoatJ, Peto York, Z. K l0004 (212) 422.4800 ZOHN E. DOLAN Zrecittice Vice Pretidetit c'ebruary I i5 Etigitieentig 4 Cotittrmtioti 3, 1975 6'GCRQQ

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Docket tto an - 6 REGVUiPRy CPPR No. 61 ROCr GLRR DPR No. 58 U.S. Nuclear Regulatory Commission Directorate of Regulatory Operations 799 Roosevelt Road Glen Ellyn, illinois 60137 Attention: Mr. James G. Keppler

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Regional Director.--.--,-

Gentlemen:

Pursuant to the regulations of 10CFR50.$ 5(e), ve herevith submit this report concerning an equipment deficiency vhich occurred, during construction at the Donald C. Cook Nuclear Plant, Bridgman, Michigan. Unit 1 is currently operating under AEC Operating License DPR-58 and Unit 2 is being constructed under AEC Construction Permit No. CPPR-61.

The equipment deficiency has been identified as diode failures in the Engineered Safeguards System test circuitry. This test circuitry is utilized to periodically verify the continuity of relay coils vhich are required for the proper operation of the Engineered Safeguards System.

The subject diodes are used for the sole purpose of protecting certain indicating lamps in the Engineered Safeguard System test circuitry from surge voltages generated vhen associated relays in this-system are reset (de-energized) ~

Such a relay reset vould occur after, these Engineered Safe-guards System relays have been energized in the performance test. Diodes associated vith these relays failed during initial performance testing of the system at vhich time detection of the failure occurred.

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