ML20134D888
| ML20134D888 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 07/26/1985 |
| From: | Mangan C NIAGARA MOHAWK POWER CORP. |
| To: | Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| (55(E)-85-22), (NMP2L-0456), (NMP2L-456), NUDOCS 8508190436 | |
| Download: ML20134D888 (2) | |
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N3M NIAGARA ISONAWK POWER CORPORAT90N/300 ERIE BOULEVARD WEST. SYRACUSE N Y.13202/ TELEPHONE U15) 4741511 l
l July 26, 1985 (NMP2L 0456) l Mr. R. W. Starostecki, Director U.S. Nuclear Regulatory Comission l
Region I I
Division of Reactor Projects t
631 Park Avenue King of Prussia, PA 19406 Re: Nine Mile Point - Unit 2 Docket No. 50-410
Dear Mr. Starostedi:
Enclosed is an interim report in accordance with 10CFR50.55(e) for the problem concerning the Reliance Motor on Limitorque Motor Operator Model No.
52 150, Design Base Event Qualification.
This problem was reported via l
tel-con to T. Silko of your staff on June 25, 1985.
Very truly yours, C. V. Manga Vice President Nuclear Engineering and Licensing CVM/GG/cla (ll37H) xc: Director of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 R. A. Gram, NRC Senior Resident Inspector Project File (2)
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ha N!AGARA M0 HAWK POWER CORPORATION NINE MILE POINT - UNIT 2 30CKET N0. 50-410 Interim Report for a Problem Concerning Reliance Motor on Limitorque Motor Operator, Model SMB-3-150, Design Base Event Qualification (55(e) 85-22)
Description of the Problem During cualification testing, a Limitorque ac motor operator exhibited a substantial loss of torque.
Such loss of torque may result in a valve's failure to respond, as specified, to an open/close signal.
The failure has been traced to the Reliance Motor and is tentatively attributed to the use of a magnesium alloy rotor.
A final report will be submitted by January 31, 1986
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