05000313/LER-1980-037-03, /03L-0:on 800929,during Monthly Surveillance of Lead Hydrogen Purge Sys,Supply Fan VSF-30A Flow Slowly Degraded & Exhaust Fan VEF-37A Tripped.Caused by Sticking Check Valves & Restricted Filters.Valves Cleaned

/03L-0:on 800929,during Monthly Surveillance of Lead Hydrogen Purge Sys,Supply Fan VSF-30A Flow Slowly Degraded & Exhaust Fan VEF-37A Tripped.Caused by Sticking Check Valves & Restricted Filters.Valves Cleaned

ML19338G190
Person / Time
Site:	Arkansas Nuclear
Issue date:	10/23/1980
From:	Bramlett L ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19338G158	List: 05000313/LER-1980-037, Forwards LER 80-037/03L-0 05000313/LER-1980-037-03, /03L-0:on 800929,during Monthly Surveillance of Lead Hydrogen Purge Sys,Supply Fan VSF-30A Flow Slowly Degraded & Exhaust Fan VEF-37A Tripped.Caused by Sticking Check Valves & Restricted Filters.Valves Cleaned
References
LER-80-037-03L, LER-80-37-3L, NUDOCS 8010280572
Download: ML19338G190 (2)

LER-1980-037, /03L-0:on 800929,during Monthly Surveillance of Lead Hydrogen Purge Sys,Supply Fan VSF-30A Flow Slowly Degraded & Exhaust Fan VEF-37A Tripped.Caused by Sticking Check Valves & Restricted Filters.Valves Cleaned

Event date:
Report date:
3131980037R03 - NRC Website

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lO NRC P ORM 364 U. S NUCL E AR REGUL ATORY COMMIST.lON (1 778 LICENSEE EVENT REPORT EXHIBIT A CONTROL BLOC 8C: l l l I l l lh (PLE ASE PRINT OR TYPE ALL REQUfRED INFORMATIONI i

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8 60 El DOCS 4T NUMBE 81t sa 69 EvtNi oATE 34 75 REPORT D ATE A0 EVENT DESCRIPTION AND PROB A'lLE CONSEQUENCES IDurino the monthly surveillance of the Lead Hydrogen purge system, the i

o 2 Isucolv fan (VSF-30A) flow slowly dearaded and the exhaust fan (VEF-37A) i o 2 1o141ltripped.

The hydroaen purae standby system was operable per surveil-1 ITTil 11ance.

The followin4 L.E.R.'s were similar in cause of system degradationr, F5Tr1 150-313/77-18, 50-313/79-01, 50-313/80-09 and 50-313/80-16.

Reportable i

Iper T.S. 6.12.3.2.B.

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JJ 34 JS 36 33 40 41 42 43 ea of CAUSE DESCRIPTION AND CORREC flVE ACTIONS liloii The canso nf the system degradatinn was dup tn check valves that were I

ii lii I stickina and filters that were restricted.

The check valves were cleanedi r,iii and the filters replaced. The system was then proved operable. Moisturet l was' determined to be the cause of the valve sticking and filter restric-i i 3 i tion.

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ATTACHMENT CAUSE & CORRECTIVE ACTION LER 50-313/80/037 The moisture in.the system was determined to be originating from the seal water to system components. A change in the system had been made to eliminate this problem; however, it appears that a valve involved in this change had been leaking. A thorough investigation is still continuing. A periodic mechanical inspection l

of these~ check valves will be added to our preventive maintenance program.

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