ML20096F174
| ML20096F174 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 08/20/1984 |
| From: | Mangan C NIAGARA MOHAWK POWER CORP. |
| To: | Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| (55(E)-84-26), (NMP2L-0135), (NMP2L-135), (NMP2L-135)), NUDOCS 8409070314 | |
| Download: ML20096F174 (2) | |
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EM NIAGARA MOHAWK POWER CORPORATION /300 ERIE BOULEVARD WEST. SYRACUSE. N Y.13202/ TELEPHONE (315) 474-1511 August 20, 1984 (NMP2L 0135)
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 an interim report in accordance with 10CFR50.55(e) for the problem concerning internal corrosion of the main steam isolation valves.
This problem was reported via telecon to your staff on July 20, 1984.
Very truly yours, g
Vice President Nuclear Engineering & Licensing AFZ:Ja Enclosure xc: Director of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 Project File (2) o!ok
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t NIAGARA M0 HAWK POWER CORPORATON NINE MILE POINT UNIT 2 DOCKET N0. 50-410
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Interim Report for the Problem Concerning Internal Corrosion of the Main Steam Isolation (MSIV)
(55(e)-84-26)
Description of the Problem Niagara Mohawk Power Corporation has become aware of a problem involving excessive valve leakage of Crosby supplied Main Steam Isolation Valves which occurred during preoperative testing at Liebstadt, Switzerland, and at Midland Station of Consumers Power.
Inspection of the valves revealed that corrosion between the valve body inside surfaces and the spool seat had developed and caused the leakage. Correspondence with Main Steam Isolation Valve supplier and evaluation of the Nine Mile Point Unit 2 Main Steam Isolation Valves confirmed that a similar condition could exist with the Nine Mile Point l' nit 2 Main Steam Isolation Valves.
The matter is still under investigation. A final report will be issued by September 28,~ 1984.
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