ML20101F621

Final Deficiency Rept (55(e)-84-33) Re RCIC Sys Turbine Steam Admission Line.Initially Reported on 840815.Drain Line Will Be Installed on Downstream Side of Steam Admission Valve

ML20101F621
Person / Time
Site:	Nine Mile Point
Issue date:	12/06/1984
From:	Mangan C NIAGARA MOHAWK POWER CORP.
To:	Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
(55(E)-84-33), (NMP2L-0281), (NMP2L-281), NUDOCS 8412270244
Download: ML20101F621 (2)

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MIAGARA MOHA.VK POWER CORPORATION /300 ERIE BOULEVARD WEST, SYRACUSE, N.Y.13202/ TELEPHONE (315) 4741511

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_' December 6,1984 (NMP2L 0281) i 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 !!r. Starostecki:

Enclosed is a final report, in accordance with 10CFR50.55(e), for. the problem concerning the reactor core isolation cooling turbine steam admission line. This problem was reported via tel-con to P. Russ of your staff on August 15, 1984 An interim report was submitted via our letter dated September 13, 1984 ,

Very truly yours, C. V. Mangan Vice President Nuclear Engineering and Licensing CVM/GG:csb (0560H) xc: Director of Inspection and Enforcement-U. S. Nuclear Regulatory Commission Washington, DC 20555 R. A. Gramm, NRC Resident Inspector' .

- Project File (2) 8412270244 341206

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NIAGARA M0 HAWK POWER CORPORATION NINE MILE POINT - UNIT 2 DOCKET NO. 50-410 Final Report for a Problem Concerning Reactor Core Isolation Cooling System Turbine Steam Admission Line (55(e)-84-33)

Description of the Problem The steam supply line to the reactor core isolation cooling system turbine contains a vertical section which could pemit accumulation of condensate.

This column of condensate may be carried into the turbine on system start.

Analysis of Safety Implications Since a detailed piping analysis was not perfomed for the condition described abcve, we cannot dismiss the potential for exceeding stress limits in the piping system during turbine start-up. Therefore, had this condition gone undetected, it could have adversely affected the safety of operations of the pl ant.

Corrective Action A 1-inch diameter drain line will be installed on the downstream side of the steam admission valve, 2ICS*MOV120 The installation will be completed prior to the turbine start-up and testing.

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