ML19309G374

LER 80-009/03L-0:on 800328,while Performing Surveillance Test,Lead Hydrogen Purge Supply fan,VSF-30A Tripped on Overload.Caused by Check Valve HPA-5 Being Stuck,Due to Corrosion from Seal Water Leaking Onto Valve

ML19309G374
Person / Time
Site:	Arkansas Nuclear
Issue date:	04/30/1980
From:	Bramlett L ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19309G371	List: ML19309G370 ML19309G374
References
LER-80-009-03L-01, LER-80-9-3L-1, NUDOCS 8005060229
Download: ML19309G374 (1)

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to EVENT DEscalPTION ANO PROS ASLE CONSEOUENCES h o e i During normal power operation, while performing a surveillance test, the 1 lET) I lead hydrogrn purge supply fan, VSF-30A, tripped on overload. The i o . l standby hydrogen purge system remained operable. The problem was found i o , i to be a stuck check valve (HPA-5) on the suction of the fan. The valve i o a twas returned to operable status by freeina the valve and completino a I o i Isuccessful surveillance test on the fot. This occurrence is similar to I o iLER's 50-313/77-009 & 78-016. Reportable per T.S. 6.12.3.2(b). i

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4J e3 de es CAUSE DESCniPTION ANO CORRECflVE ACTIONS h m iInvestination revealed the cause of the stuck check valve to be corrosion i

[m-] Idue to the seal water leaking onto the supply check valve when the unit i

, iwas not running. Preventive maintenance was performed on the 3 similar i m Ivalves in the hydrocen ource system. A desien chance to isolate the i . I seal water from the fans when not needed. has been initiated.

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