05000281/LER-1980-034-03, /03L-0:on 801122,valve MOV-CW-200A Failed 75% Open.Caused by Corroded Torque Switch Stuck in Open Position.Switch Replaced

/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: 05000281/LER-1980-034-03, /03L-0:on 801122,valve MOV-CW-200A Failed 75% Open.Caused by Corroded Torque Switch Stuck in Open Position.Switch Replaced 05000281/LER-1980-044-03, /03L-0:on 801124,pump 2-SI-P-1A Declared Inoperable Due to Low Resistance.Caused by Connection Box Grounded Out by Rainwater.Box Dried Out,Roof Hatch Repaired & Pump & Motor Tested ML18139A939
References
LER-80-034-03L-02, LER-80-34-3L-2, NUDOCS 8012290455
Download: ML18139A941 (2)

LER-1980-034, /03L-0:on 801122,valve MOV-CW-200A Failed 75% Open.Caused by Corroded Torque Switch Stuck in Open Position.Switch Replaced

Event date:
Report date:
2811980034R03 - NRC Website

text

-j RC FORM 366

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.UCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT CONTROL BLOCK: I l G)

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6

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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

!)))) 1water in the intake canal.

Therefore, the health and safety of the public were not.

[]:JI] affected.

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SYSTEM CODE

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CODE I!*

1013141 j/l jOj31 23 24 26 27 28 29 COMP.

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SHUTDOWN

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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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'3a' STATUS

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11 12 13 PERSONNEL INJURIES

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11 12 80 LOSS OF OR DAMAGE TO FACILITY '43' TYPE

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J. L. Wilson NAME OF PREPARER-----------------

(804) 357-3184 PHONE:------------

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ATTACHMENT 1 SURRY PO'WER DOCKET NO:

REPORT NO:

EVENT DATE:

e STATION,, UNIT NO. 2 50-281 80-034/03L-0 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