ML19309G394

LER 80-012/03L:on 800406,while Performing Monthly Inservice Valve Stroke Test,Emergency Feedwater Supply valves,CV2667 & CV2617,failed to Fully Open.Caused by Binding Due to Loose Bolts Securing Actuator

ML19309G394
Person / Time
Site:	Arkansas Nuclear
Issue date:	05/02/1980
From:	Shively C ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19309G378	List: ML19309G377 ML19309G394
References
LER-80-012-03L-01, LER-80-12-3L-1, NUDOCS 8005060249
Download: ML19309G394 (1)

Text

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,4 He,ongo.13 so 60 .I o.yi.st a t ,,uwe g. 6. PS EVENT 08 SCRIPT'ON AND PROBABLE CONSEQUENCES O'o o 2 During normal power operation, while performing a monthly inservice valve 1 o ritroke test, the emergency feedwater supply valve, CV2667, failed to fully l o . ppen on demand. The valve was repaired and declared operable, but failed i p isi Ahe following day, along with EFW supply valve, CV2617. The redundant EFW i t o is i flow path was operable in each case. This occurrence is similar to LER- i o a LER-50-313/80-005. Reportable per T.S.6.12.3.2.b. I l

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CAUSE OESCA.PTION ANO COR5sECrivE ACT8ONS h liioi 11he apparent cause was binding. Valve CV-2667 initially had the stem i FrT71 ilubricated & read. justed torque switch settino. Cause of binding was

, 2 1 subsequently identified to be loose bolts securing actuator to valve body.i g i Bolts were properly torqued and the torque switch was_ replaced to insure ;

i ireliability. Maintenance procedure will. be revised to include bolt torquing.

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