ML20214T317

Interim Deficiency Rept 86-00-18 Re Cracked Latch Roller Bearing on MSIV 2MSS*HYV7A.Initially Reported on 860808. Problem Under Investigation.Final Rept Will Be Submitted by 861020

ML20214T317
Person / Time
Site:	Nine Mile Point
Issue date:	09/11/1986
From:	Mangan C NIAGARA MOHAWK POWER CORP.
To:	Kane W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
86--18, 86-00-18, NMP2L-0871, NMP2L-871, NUDOCS 8609300259
Download: ML20214T317 (3)

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, ., y SG-oo- d M Y NIAGARA R UMOHAWK NBAGARA R$0 HAWK POWER CORPORATION /300 ERIE BOULEVARD WEST, SYRACUSE, N.Y.13202/ TELEPHONE (315) 474-1511 September 11, 1986 NMP2L 0871 Mr. W. Kane, Director U.S. Nuclear Regulatory Comission 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. Kane:

Enclosed is an Interim Report of a Problem, in accordance with 10CFR50.55(e),

for a problem concerning a cracked roller bearing on one Main Steam Isolation Yal ve. This problem was identified to your office on August 8, 1986 by telecon. The final Report of a Problem will be submitted by October 20, 1986.

Very truly yours, C

Senior Vice President CVM/AP/cla (1770H) xc: Director of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 W. A. Cook, NRC Senior Resident Inspector WPC Project File ganau Be%

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NIAGARA M0 HAWK POWER CORPORATION NINE MILE POINT - UNIT 2 DOCKET NO. 50-410/86-00-18 Interim Report for a Problem Concerning Crosby Valve 2 MSS *HYV7A Cracked Roller Bearing Description of the Problem While testing the' Main Steam Isolation Valve Actuators, a cracked Latch Roller Bearing was identified on valve 2 MSS *HYV7A. The Latch Roller Bearing secures the valve in the open position during normal plant operation. The Latch Roller Bearing .is required to disengage from the latch upon actuation by trip solenoids to ensure valve closure.

This matter is under investigation and a final report will be submitted by October 20, 1986.

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