ML20084E721

Ro:On 700514,during Reactor Cooldown Procedure,Msiv 1B Failed to Close.Caused by Malfunction of Valve Mechanism. Packing Gland Loosened

ML20084E721
Person / Time
Site:	Ginna
Issue date:	05/22/1970
From:	Nelson E ROCHESTER GAS & ELECTRIC CORP.
To:	Morris P US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084E724	List: ML20084E721 ML20084E746
References
NUDOCS 8304150321
Download: ML20084E721 (2)

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ROCllESTER CA5 ANU ELEC TNtC CoRPORATIUll . W) EAST AVCHUE, ROCI ES TER,11 Y l K'] t ex .n w . > + s -. >.

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t May 22,1970 t

t Dr. Peter A. Morris, Director Division of Reactor Licensing ,_ _ _,

United States Atomic Energy Commission gf P , Eg 7920 Norfolk Avenue i%9 M Bethesda, Maryland 20014 j

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Subject:

Failure of Main Steam Line {r b / 40 Rl l Isolation Valve MSIV-1B to close t

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Ginna Station Urlit No.1 .

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l Docket No. 50 244 /,-

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Dear Dr. Morris:

On May 14,1970, at 2200 hours0.0255 days <br />0.611 hours <br />0.00364 weeks <br />8.371e-4 months <br /> the turbine generator was manually l tripped off the line in a senedcled trip test while generating at 100 per cent

! reactor power. The purpose of the test was to verify the ability of the

! primary and secondary plants to sustain a trip from 100 per cent of power ,

and to bring the plant to a hot shutdown condition in an orderly manner.

j The performance of the system was excellent. This test preceded scheduled ip'M .

maintenance work on the turbine and the reactor primary loop temperature instrumentation.

, Immediately following the trip, the reactor plant was held at hot l shutdown condition and checking of the reactor primary loop RTD's l proceeded. Upon completion of these checks the reactor was to be taken  :

to cold shutdown condition.

At approximately 2330 hours0.027 days <br />0.647 hours <br />0.00385 weeks <br />8.86565e-4 months <br /> on May 14, 1970, the Reactor Operator i tripped the Main Steam Line Isolation Valves M3IV-1A and MSIV-1B as the first step in the reactor cooling down procedure. Position indicating lights ~

on the control board indicated that valve MSIV-1B had failed to close. The .

Reactor Operat'or immediately notified the Shift Foreman. . .

8304150321 700522 PDR ADOCK 05000244 PM g .

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. m Dr. Peter A. Morrio l The inctrinnent and control group examined the valve trip mechani::m and determined that the trip scheme had omrated to clore the valve, but %

valve inochanium had not functioned. Following examination of the valve, ateamfitteru were called to loocen the packing gland. The Shift Foreman wac then able to owrate the valve over part of its travel and after several omraticns succeeded in fully closing the valve.

This valve, EE"V-1B, was repacked during the previour uhutciown period of March 30,1?70 to April 24, 1970. It was tested on April 24, 1070, at 0030 hourc and clored in cne recond. Cn April 27, 1970, the packing glands on both valvea,1:JIV-1A and MSIV-1B, were drawn down by the steamfitters to carrect leakage.

It is n:w planned to incpect this valve thoroughly during the precent shutdown and test it fcr full travel and time of closure prior to startup. )

'Jr. Cantrell and hi . Ki,rkman of the USAEC Division of Compliance were pecparly notified of this incident.

Very truly youro, h.lg . M c

Edward J. Netcon I

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