ML20084L122

Interim Deficiency Rept Re Power Generation Control Complex Separation Criteria.Initially Reported on 840323. Investigation Continuing in Divisionalized & Channelized Sys.Final Rept Will Be Submitted by 840630

ML20084L122
Person / Time
Site:	Nine Mile Point
Issue date:	04/24/1984
From:	Mangan C NIAGARA MOHAWK POWER CORP.
To:	Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
(NMP2L-0036), (NMP2L-36), NUDOCS 8405140345
Download: ML20084L122 (2)

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Y NIAGARA NUMOHAWK NIAGARA MOHAWK POWER CORPORATION /300 ERIE BOULEVARD WEST, SYRACUSE. N.Y.13202/ TELEPHONE (315) 474-1511 April 24,1984 (NMP2L0036)

Mr. R. W. Starostecki, Director U. S. Nuclear Regulatory Commission Region I Division of Project and Resident Programs 631 Park Avenue King of Prussia, PA 19406

SUBJECT:

Nine Mile Point - Unit 2 4 Docket No. 50-410 Enclosed is an interim report in accordance with 10CFR50.55(e) for the problem concerning Power Generation Control Complex PGCC Separation Criteria (55(e)-84-14). This problem was reported in a telephone conversation between T. R. Loomis (Nine Mile Point Unit 2 Licensing) and Mr. S. Collins of your staff on March 23, 1984.

Very truly yours, h%O/D dM C. V. Mangan Vice President Nuclear L: censing and Engineering CVM/TRL:1f cc: Director of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, DC 20555 R. Gramm (NRC Resident Inspector) 8405140345 840424 gDRADOCK 05000410 PDR W

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NIAGARA M0 HAWK POWER CORPORATION NINE MILE POINT - UNIT 2 DOCKET NO. 50-410

, Interim Report for a Problem Concerning Power Generation Control Complex (PGCC)

Separation Criteria (55(e)-84-14) '

Description of the Problem Nonconformances in separation criteria have been identified by Field Quality Control inspection of PGCC panels. These wiring separation nonconformances were not previously documented and justified by General Electric during the manufacturing process prior to shipment.

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The specific problem identified was that devices of different divisions were mounted on a panel allowing less than a 6 inch separation without an installed barrier.

- A further investigation is continuing at the present time in the following i areas:

1. Separation between divisions (in divisionalized systems).

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2. Separation between channels (in channelized systems).

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3. Separation between divisions and channels.

A final report will be submitted to the Nuclear Regulatory Commission by July 30, 1984.

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