ML18139A866

LER 80-036/03L-0:on 801101,discovered That MOV-FW-251B Could Not Be Closed from Control Room.Caused by Misplacement of Limitorque Cover & Three Broken Control Wires.Cover & Wires Replaced

ML18139A866
Person / Time
Site:	Surry
Issue date:	11/01/1980
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139A865	List: ML18139A864 ML18139A866
References
LER-80-036-03L-02, LER-80-36-3L-2, NUDOCS 8012030723
Download: ML18139A866 (2)

Text

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• I With the unit at hot shutdown, it was'-di.scovered that MOV-FW-251B could not be closed fran the Control Room. Th-i.s event is reportable per T.S. 6.6.2.b. (2). Nonnal feed control was Js~lishetl and the auxiliary feedwater system was secured. Hence, MOV-FW-LE] I . . .

251B was not requiretl to.be closetl to control steam generator level. Therefore, the health and safety of the public were not affectetl.

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!The limitorque cover was found not to be placetl and three control wires brolcen. The IDJ Ir~on for the cover not being placeo and wires broken can not be dete:rmineo. These wires* were replaced and the valve testetl satisfactorily. The cover was also replacetl.

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• ATI'ACHMENT 1 (PAGE 1 OF 1 .

SURRY POWER STATION, UNIT 2 DOCKET NO; 50-281 REPORI' NO; 80-036/031r-0 EVENT ,DATE: 11-01-80 SUBJECT': MOV-FW-251B INOPERABLE

1. EVENT DESCRIPI'ION:

With the unit at hot shutdown following a reactor trip, MOV-FW-251B was in a position to fulfill its required safety function, subsequently it*was discovered that MOV-FW-251B would not respond to control switch operation. 'Ibis event is reportable per T.S. 6.6.2.b.(2).

2. PROBABLE *cON~S:

This valve is one of six valves that are used to control steam generator level when the auxiliary feedwater systan is in operation. With MOV-Th,._251B failed in the open position, existing procedures provide for on-off control of aux.

feed pumps to control S/G level. Hc:wever, long before this was necessary, nonnal feed was re-established and the auxiliary feed systanwas removed from service.

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

3. CAUSE:

The limitorque cover was found not to be placed and three control wires broken.

The reason for the cover not being placed and wire broken can not be detennined.

4. IMMEDIATE (X)RREx::'I'IVE ACI'ION:

The imnediate corrective action:was to transfer steam generator level control to. the main feed system.

5. -SUBSEOOENT *coRREx::TIVE ACI'ION:

The subsequent corrective action was to repair the broken wires and replace the cover. The MOV was subsequently tested satisfactorily.

6. ACI'ION TAKEN 'TO PREVEm' 'RECURRENCE:

None.

7. GENERIC IMPLICATIONS:

None.