05000280/LER-1979-019-03, /03L-0 on 790510:while Securing Purging Operations,Valve MOV-100D Did Not Close.Caused by Bearing Failure W/Resultant Gear Malfunction.Parts Replaced & Valve Returned to Svc

/03L-0 on 790510:while Securing Purging Operations,Valve MOV-100D Did Not Close.Caused by Bearing Failure W/Resultant Gear Malfunction.Parts Replaced & Valve Returned to Svc

ML18114A636
Person / Time
Site:	Surry
Issue date:	06/01/1979
From:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18114A635	List: 05000280/LER-1979-019, Forwards LER 79-019/03L-0 05000280/LER-1979-019-03, /03L-0 on 790510:while Securing Purging Operations,Valve MOV-100D Did Not Close.Caused by Bearing Failure W/Resultant Gear Malfunction.Parts Replaced & Valve Returned to Svc
References
LER-79-019-03L-01, LER-79-19-3L-1, NUDOCS 7906050312
Download: ML18114A636 (2)

LER-1979-019, /03L-0 on 790510:while Securing Purging Operations,Valve MOV-100D Did Not Close.Caused by Bearing Failure W/Resultant Gear Malfunction.Parts Replaced & Valve Returned to Svc

Event date:
Report date:
2801979019R03 - NRC Website

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(Attachment, page_l of 1)

Surry Power Station, Unit No. 1 Docket No: 50-280 Report No: 79-019/03L-O Event Date: 5-10-79 Title:

Failure of Valve (MOV-lOOD) to Close on Signal

1.

Description of Event

With the reactor at cold shutdown condition and while attempting.to secure purging, it was noted MOV-lOOD did not close on signal.

Further efforts to shut the valve manually were equally unsuccessful.

2.

Probable Consequences and Status of Redundant Systems:

Since there are two valves (one inside and one outside containment) giving a redundancy to the system, and the second valve functioned properly~

the integrity of the system was maintained.

The health and safety of the public were not affected.

3.

Cause

This malfunction was caused by an internal bearing failure which prevented the valve operator from functioning properly.

4.

Immediate Corrective Action

When manual movement of.the valve proved unsuccessful, a maintenance report was initiated to correct the problem.

5.

Subsequent Corrective Action:

The bearing was replaced and the unit was tested satisfactory after maintenance.

6.

Action Taken to Prevent Recurrence:

This event is considered a random mechanical failure, and no further action is necessary.

7.

Generic Implic2tions:

None