ML20095L570

Final Deficiency Rept (55(e)-84-14) Re Power Generation Control Complex Separation.Initially Reported on 840323. S&W Will Rework Panel Wiring.Corrective Actions Expected to Be Completed by 841231

ML20095L570
Person / Time
Site:	Nine Mile Point
Issue date:	08/09/1984
From:	Mangan C NIAGARA MOHAWK POWER CORP.
To:	Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
(55(E)-84-14), (NMP2L-0122), (NMP2L-122), NUDOCS 8408300345
Download: ML20095L570 (3)

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N M tfie NIAGARA MOHAWK POWER CORPORATION /303 EPIE BOULEVARD WEST SYRACUSE, N.Y.13202/ TELEPHONE (315) 474-1511 August 9, 1984 (NMP2L 0122)

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 Re: Nine Mile Point Unit 2 Docket No. 50-410

Dear Mr. Starostecki:

Enclosed is a final report in accordance with 10CFR50.55(e) for the problem concerning Power Generation Control Complex separation (55(e)-84-14).

This problem was reported via telecon to Mr. S. Collins of your staff on March 23, 1984. An interim report was submitted in a letter dated April 24, 1984.

Very truly yours, M

C. V. Man n Vice President Nuclear Engineering & Licensing TL:ja Enclosure xc : Director of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 ProjectFile(2) 0400300345 840809 gDRADOCK05000 l

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4 n NIAGARA M0 HAWK POWER CORPORATION NINE. MILE POINT.- UNIT 2 DOCKET'NO. 50-410 Final Report for a Problem Concerning PGCC Separation

-(55(e)-84-14) fDescription of the' Problem

, ?Nonconformances in separation criteria have been identified by a Field Quality Control' inspection of Power Generation Control Complex (PGCC) panels. These wiring separation nonconformances were not' documented and justified by General Electric during the manufacturing process. prior to. shipment.

Investigation; jointly undertaken by Stone & Webster Engineering and Field-Quality Control personnel have-identified deviations from the separation criteria in the'following areas:

1. -Separation between divisions of safety-related systems.

- 2. Separation between channels of channelized safety-related systems.

3.. Separation between divisions and channels of safety-related systems.

Analysis of Safety Implications The problem identified is a deviation from the separation requirements of Regulatory Guide 1.75.- If the separation criteria were not met, a possibility exists that under certain conditions, the loss of devices in one division may result in adversely affecting the safety function of devices in the other division. Therefore, if this problem were to have remained uncorrected, it could have adversely affected the safety of operation of the plant.

Corrective Action To correct the wiring separation nonconformances and to prevent future possible nonconformances in separation requirements, the following actions were undertaken:

1. - Definition and clarification of General Electric's separation requirements for the three identified areas above. This task has been completed pending ongoing verification by Niagara Mohawk.

2. Incorporation of the separation requirements in the specification and drawings. General Electric presently is performing this task.

3. Justification by analysis of exceptions to the established separation criteria. General Electric is presently performing this task.

4. Rework of the panel wiring by Construction to meet the requirements identified in corrective action Items 1 and 2 above. Stone & Webster Engineering Corporation presently is performing this task.

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_The completion date for the above corrective actions is_ December- 31, 1984.

Per a discussion between T. Loomis (NMP2 Licensing) and S. Collins of your-staff on June 29, 1984, the above corrective actions ensure a completion of the corrective actions as stated in our final-50.55(e) report concerning '

separation criteria for the Power Generation Control Complex equipment dated

' October 28, 1983.

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