ML20002B108

LER 80-039/03L:on 801028,exhaust Fan VEF-37A on Lead Hydrogen Purge Sys Tripped.Caused by Short in Control Sys Due to High Resistance Connections at Solenoid Valve Terminals.Rectifier & Control Fuse Replaced & Leads Cleaned

ML20002B108
Person / Time
Site:	Arkansas Nuclear
Issue date:	11/25/1980
From:	Bramlett L ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20002B099	List: ML20002B098 ML20002B108
References
LER-80-039-03L-01, LER-80-39-3L-1, NUDOCS 8012090445
Download: ML20002B108 (2)

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CAUSE DESCRIPTION AND CORREC DVE ACTIONS i

li lo l 1 The cause of the exhaust fan trio was determined to be from a short in I i i i the enntrol system. The short occurred due to high resistance connec- I Lu U i tions at the teminals of the solenoid valve which suoDlies service wateri u L.J l to seal the fan. This caused the valve rectifier to fail and in turn i

' I caused the control transfomer fuse to blow. Since (see attachment) i

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L.E.R. # 50-313/80-039 November 25, 1980 l

ANO Unit 1 Cause Description & Corrective Action the fan and solenoid valve are powered through the same control transformer fuse, the fan tripped. The rectifier and control fuse were replaced. The solenoid valve was inspected, leads were cleaned and the valve tested. The system was tested and proved operable.

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