ML20095L600
| ML20095L600 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 08/10/1984 |
| From: | Mangan C NIAGARA MOHAWK POWER CORP. |
| To: | Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| (55(E)-84-21), (NMP2L-0123), (NMP2L-123), NUDOCS 8408300362 | |
| Download: ML20095L600 (2) | |
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NMn NIAGARA MOHAWK POWER CORPORATION /300 ERIE BOULEVARD WEST. SYRACUSE, N.Y.13202/ TELEPHONE (315) 474-1511 August 10, 1984 (NMP2L 0123)
-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 service life of relays in safety-related systems. This problem was reported via telecon to W. Lazerus of your staff on June 13, 1984. Via telecons with S. Collins of your staff, the final report was ini-tially scneduled for July 30, 1984 and subsequently rescheduled for August 10, 1984.
Very truly yours, M\\
C. V. Mang Vice President Nuclear Engineering & Licensing GAG /cc Enclosure xc: Director of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 Project File (2) 8408300362 840810 PDR ADOCK 05000410 S
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~ NIAGARA M0 HAWK POWER' CORPORATION NINE MILE POINT UNIT 2
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. DOCKET NO. 50-410
. Final Report for a Problem Concerning the Service Life of Relays in Safety-Related Systems (55(e)-84-21)
Description of the' Problem i
The problem concerns the earlier.than' anticipated end-of-service. life failures
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.for relays'in energized applications used in safety-related systems. The relays identified in NRC;IE Information Not':e 84-20 are Agastat.GP series relays manufactured by Amerace Corporation and GTE Sylvania ac relays manufac--
-tured by GTE Sylvania Corporation. Only Agastat GP series relays are used in
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Nine Mile Point Unit 2 design.
Review of Nine Mile. Point Unit 2 design revealed that Agastat GP series relay's
- have been used throughout the plant in both energized and deenergized applica-tions in safety-relatedLClass IE circuits.
4 Analysis of Safety Implications l
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.The qualified end-of-service life for these relays has not been established for the Nine Mile Point Unit 2 design.
However, earlier-than-anticipated
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end-of-service life of these relays could have prevented the safety-related circuits in'which they are located from performing their design function prior 1
to detection by surveillance. Therefore, if this problem were to have re-mained uncorrected, it could have adversely affected the safe operations of the plant.
f Corrective Action
- To correct the problem, a replacement parts program will be developed for Nine i
Mile. Point Unit 2.to replace these relays in an interval based on the service life determined by General Electric Company and Amerace. The corrective action will be-. implemented by July 15, 1985.
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