ML20113C918

Interim Deficiency Rept Re Misapplication of Emergency Load Sequencer Output Relays Supplied by Consolidated Controls Corp.Initially Reported on 850118.Next Rept Will Be Provided by 850430

ML20113C918
Person / Time
Site:	Hope Creek
Issue date:	02/19/1985
From:	Martin T Public Service Enterprise Group
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
NUDOCS 8504120118
Download: ML20113C918 (2)

Text

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Pubhc Service Electric and Gas Company Thomas J. Martin 80 Park Plaza Newark, NJ 07101 201430-8316 Mailing Addren: P.O. Box 570, Newark, NJ 07101 Vice President Engineering and Construction February 19, 1985 Dr. Thomas E. Murley, Administrator U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region I 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Dr. Murley:

POTENTIAL CONSTRUCTION DEFICIENCY MISAPPLIED SEQUENCER RELAYS HOPE CREEK GENERATING STATION On January 18, 1985, a verbal report was made to Region I, Office of Inspection and Enforcement representative, Mr. J.

Strosnider, advising of a potentially significant construc-tion deficiency concerning sequencer relays supplied by Consolidated controls Corporation that may be misapplied for their intended function. The following interim report is provided in accordance with 10CFR50.55 (e) .

Dechtel, our Architect / Engineer and Constructor, has advised us that there is a potential misapplication of emergency load sequencer output relays supplied by Consolidated Controls Corporation to input the Dailey Controls system and associated switchgear. Airpax-North American philips, the manufacturer of the 07 series relay, informed Dochtel that, in a DC appli-cation, there is a question concerning the relay's ability to quench the arc drawn by the contacts as they open, due to insufficient clearance betwoon the contacts in the full open position. Consequently, the contacts of the sequencer output relay may wold together resulting in a subsequent misoperation of the circuit.

A total of 144 serios 07 relays have boon supplied to the Hopo Creek project. Some of thoso relays wnre intended for the DC application and would sequenco equipment energization under Loss of Power (LOP) conditions to precludo Emergency Diesel

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Dr. T. E. Murley 2 2/19/85 Generator overload. The affected relays are installed in panels 1A428, 1B428, 1C428 and 1D428. Bechtel has issued Nonconformance Report No. 6415 to document and_ control the affected relays.

Bechtel, the manufacturer and the system supplier are presently evaluating the. problem. We anticipate providing you with a further report by April 30, 1985.

Very truly yours, 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 1100 circle 75 Parkway, suite 1500 Atlanta, GA 30339

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