ML18139A941

LER 80-034/03L-0:on 801122,valve MOV-CW-200A Failed 75% Open.Caused by Corroded Torque Switch Stuck in Open Position.Switch Replaced

ML18139A941
Person / Time
Site:	Surry
Issue date:	12/19/1980
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139A940	List: ML18139A939 ML18139A941 ML18139A942
References
LER-80-034-03L-02, LER-80-34-3L-2, NUDOCS 8012290455
Download: ML18139A941 (2)

Text

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jOn November 22, 1980, while returning the "A" water box to service,MOV-CW-200A failed

((J]J !with the valve approximately 75 percent open. This is reportable per T. S. 6.6.2.b. (2)j.

~ jThe redundant valve (MOV-CW-206A) was operable and would have closed to preserve the

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!The torque switc;h was fonnd to he corroded and stuck , n tbe open position The svritcb was replaced and the valve tested satisfactory.

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J. L. Wilson (804) 357-3184 0 c..,.,

NAME OF P R E P A R E R - - - - - - - - - - - - - - - - - PHONE:------------

ATTACHMENT 1 e

SURRY PO'WER STATION,, UNIT NO. 2 DOCKET NO: 50-281 REPORT NO: 80-034/03L-0 EVENT DATE: 11-22-80

SUBJECT:

MOV-CW-200A INOPERABLE

1. DESCRIPTION OF EVENT:

On 22 November, 1980, with Unit No. 2 at 100% power the outlet butterfly valve for "A" water box failed to operate. The valve had been po-sitioned to appro.xi-mately 75% open. Subsequently it failed to respond to both open and close demands. This is reportable Per Tech. Spec. 6.6.2.b.(2).

2. PROBABLE CONSEQUENCES AND STATUS OF REDUNDANT EQUIPMENT:

The condenser water box isolation valves close during a LOCA in coincidence with a loss of offsite power to preserve the water in the intake canal for ECCS com-ponents. The inlet butterfly* valve (MOV-CW-206A) was operable and would have closed. Therefore, the health and safety of the public were not affected.

3. CAUSE:

The MOV's torque switch was found to be corroded and stuck in the open position.

4. IMMEDIATE CORRECTIVE ACTION:

An operator in radio contact with the control room was stationed at the valve to immediately close the valve if required.

5. SUBSEQUENT CORRECTIVE ACTION:

The torque switch was replaced and the valve tested operable.

6. ACTION TAKEN TO PREVENT RECURRENCE:

None required.

7. GENERIC IMPLICATIONS:

None