ML20040H006

LER 82-002/03L-0:on 820114,RCS Letdown Isolation Valve CV-1221 Failed to Close Properly During Quarterly Surveillance Test.Caused by Torquing Out of Valve Operator Apparently Due to Low Torque Switch Setting

ML20040H006
Person / Time
Site:	Arkansas Nuclear
Issue date:	02/01/1982
From:	Rogers P ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20040G999	List: ML20040G998 ML20040H006
References
LER-82-002-03L-01, LER-82-2-3L-1, NUDOCS 8202160725
Download: ML20040H006 (2)

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63 EVENT DATE 34 'S HE,OHT DATE 80 EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES h o

I On 1-14-82 while at 84% full Dower, the Reactor Coolant System (RCS) i o a i letdown isolation valve CV-1221, failed to close properly during a i o . I quarterly surveillance test which is required per T.S.4.4.1.4. If RCS i in isi 11etdown isolation had been necessary, the letdown cooler inlet valves, i o e i CV-1213 and CV-1215, the letdown cooler outlet valves, CV-1214 and CV- ,

o > (1216. or the letdown block valve and letdown flow control valve, CV-1222 i o ,, i and CV-1223 respectively, could have been closed. In the event of

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[ED I shooting revealed no unusual mechanical hindrance, but did reveal that the EII] I toraue switch settino was in the lower portion of the recomended operat-i i 3 l ina rance. The torque switch setting was increased slightly within the i i 4 Irecommended rance. i 7 8 9 STA  % ,0WER OTM(MSTATUS st v HT De5Cuv E H V i s NA

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NAME OF PREPARER - Patrick Rooers _ ,,, oy , _ 5di/964-3100 8202160725 B20201 PDR ADOCK 05000313 S PDR

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- '* ATTACHMENT LER NO. 50-313/82-002/03L-0

'EVENTDESCRIPTIONANDPROBABLECONSEQUENCES(cont'd) engineered safeguards actuation CV-1214 and CV-1216 would have automatically closed to isolate letdown. This occurrence is reportable per T.S.6.12.3.2.b.

Similar occurrences were reported by LERs 50-313/81-011,81-009, 80-033,80-023, 79-021,78-002 and 75-012.

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