ML20129J087
| ML20129J087 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 05/20/1985 |
| From: | Mangan C NIAGARA MOHAWK POWER CORP. |
| To: | Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| (55(E)-84-56), (NMP2L-0416), (NMP2L-416), NUDOCS 8506100010 | |
| Download: ML20129J087 (2) | |
Text
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u Y NIAGARA R u MOHAWK
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NIAGARA MOHAWK POWER CORPORATION /300 ERIE BOULEVARD WEST. SYRACUSE. N Y.13202/ TELEPHONE (315) 474-1511 May 20,1985 (NMP2L0416)
Mr.-R._W. Starostecki, Director U.S. Nuclear Regulatory Commission Region I Division of Reactor Projects 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 check valves in the LPCS system. This problem was reported via.tel-con to R. Barkley of your staff on December 27, 1984.
An interim report was submitted via our letter dated January 28, 1985.
Very truly yours, C. V. Manga Vice President Nuclear Engineering and Licensing CVM/GG/cla xc:. Director of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555
-R. A. Gram, NRC Senior Resident Inspector Project File (2) l 8506100010 850520 PDR ADOCK 05000410 S
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L NIAGARA M0 HAWK POWER CORPORATION r-NINE MILE POINT'- UNIT 2-DOCKET NO. 50-410 Final Report for a Problem-Regarding Check Valves inLthe Low Pressure Core Spray System (55(e)-84-56)
De'scription of'the Problem The' check valve located on the Low Pressure Core Spray. system. test return.and
- minimum flow lines to the suppression pool may experience a pressure greater
.than,the design pressure of 180 psig. The pressure-in the valve may increase to-525 psig when the discharge line to the suppression pool is_ isolated and the Low Pressure Core Spray is-in the rdnimum flow or test mode causing the pump to run at shutoff head.
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Analysis of Safety Implications-The check valve manufacturer (Velan), after reviewing the valve' design, has
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confirmed that the pressure rating of the check valve can be increased to 525 psi g'.
Since the valve, as designed.. is acceptable for use at the higher
. design pressure, no safety implications exist.
Corrective Action The valve nameplate will be changed to indicate-the higher pressure rating, f
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