05000366/LER-1979-114-03, /03L-0:on 791015,pump Suction from Suppression Chamber Valve 2E41-F041 Failed to Open When Initiated from Control Switch.Caused by Failure of Motor Winding.Direct Cause Not Known

/03L-0:on 791015,pump Suction from Suppression Chamber Valve 2E41-F041 Failed to Open When Initiated from Control Switch.Caused by Failure of Motor Winding.Direct Cause Not Known

ML19254F515
Person / Time
Site:	Hatch
Issue date:	11/02/1979
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19254F514	List: 05000366/LER-1979-114, Forwards LER 79-114/03L-0 05000366/LER-1979-114-03, /03L-0:on 791015,pump Suction from Suppression Chamber Valve 2E41-F041 Failed to Open When Initiated from Control Switch.Caused by Failure of Motor Winding.Direct Cause Not Known
References
LER-79-114-03L, LER-79-114-3L, NUDOCS 7911090565
Download: ML19254F515 (2)

LER-1979-114, /03L-0:on 791015,pump Suction from Suppression Chamber Valve 2E41-F041 Failed to Open When Initiated from Control Switch.Caused by Failure of Motor Winding.Direct Cause Not Known

Event date:
Report date:
3661979114R03 - NRC Website

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6l DOCKET NUVDER 68 69 EVENT DATE 74 75 REPORT DATE S0 EVENT DESCRIPTION AND PRO 8ADCE CONSEQUENCES h l With the reactor =in the run mode, while performing procedure HNP-2-3302.(HPCI Valve - ]

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,a 3 l Operability, the 2E41-F041 (Pump suction from the Suppression Chamber Valve) failed l

l to open when initiated from the Control Switch. The falve operability test was being l o

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[ performed in preparation for making HPCI operable following Maintenance of the

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l o s I system. This is a repetitive occurrence as reported on LER 79-086.

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_l i j o j l The cause of the 2E41-F041 valve failure was a failure of the motor winding. The l

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direct cause of failure is not known at this time.

The problem is ur der investiention.1

[ It is theorized that motor failure could be attributed to moisture or high humidity.

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l tinuous current saturation of winding so as to keep motor internals free from (cont) 1 i

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A Georgia Power Company Plant E.

I. llatch Baxley, Georgia 31513 Reportable Occurrence Report No. 50-366/1979-114 Cause Description and Corrective Action (cont) moisture.

Procedures have been reviewed to determine the number of operations during surveillance and time limit of motor operation. Test equipment has been installed in the circuit to monitor future valve cycles in an attempt to identify the problem. A follow-up report will be submitted with the findings of the investigation.

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