05000280/LER-1979-021-03, /03L-0 on 790608:during Cold Shutdown,Isolation Valve MOV-SW-104C to Recirculation Spray Heat Exchanger C Would Not Close Properly.Caused by Momentary Steam Binding. Valve Cycled Electrically & Returned to Svc

/03L-0 on 790608:during Cold Shutdown,Isolation Valve MOV-SW-104C to Recirculation Spray Heat Exchanger C Would Not Close Properly.Caused by Momentary Steam Binding. Valve Cycled Electrically & Returned to Svc

ML18114A757
Person / Time
Site:	Surry
Issue date:	07/02/1979
From:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18114A756	List: 05000280/LER-1979-021, Forwards LER 79-021/03L-0 05000280/LER-1979-021-03, /03L-0 on 790608:during Cold Shutdown,Isolation Valve MOV-SW-104C to Recirculation Spray Heat Exchanger C Would Not Close Properly.Caused by Momentary Steam Binding. Valve Cycled Electrically & Returned to Svc
References
LER-79-021-03L, LER-79-21-3L, NUDOCS 7907060298
Download: ML18114A757 (2)

LER-1979-021, /03L-0 on 790608:during Cold Shutdown,Isolation Valve MOV-SW-104C to Recirculation Spray Heat Exchanger C Would Not Close Properly.Caused by Momentary Steam Binding. Valve Cycled Electrically & Returned to Svc

Event date:
Report date:
2801979021R03 - NRC Website

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'.. -.... ~___.., page 1 of 1 Surry Power Station, Unit 1 Docket No. 50-280 Report No. 79-021/03L-0 Event Date:

6-8-79 Failure of MOV-SW-104C to Operate Properly

1.

Description of Event

While at cold shutdown, isolation valves to the Recirculation Spray Heat Exchangers were exercised.

Isolation valve MOV-SW-104C to Heat Exchanger 1-RS-E-lC would not fully close electrically during this exercise.

After the valve was closed manually, it was successfully cycled open and closed electrically.

This event is contrary to Technical Specifications 3.4.A.5 and reportable per Technical Specifications 6. 6. 2.b. (2).

2.

Probable Consequences of Event:

The failure of the motor operated valve to fully close electrically had no effect upon the health or safety of the general public because adequate isolation would have been available via the manual operator, if required.

3.

Cause of Event

The failure of the valve to close fully is attributed to momentary stem binding resulting in torque switch actuation.

All subsequent operation of.the valve has been satisfactory.

4.

Immediate Corrective Action

The immediate corrective action taken was to close the valve manually and cycle it electrically.

A maintenance report was submitted.

5.

Scheduled Corrective Action:

No future corrective action is deemed necessary at this time.

Maintenance investigation revealed no other problems and the valve was returned to service *

. 6.

Action Taken To Prevent Recurrence:

No preventative actions.are scheduled at this time.

7.

Generic implications:

The event poses no generic implications.

The problem was not due to a material fault.