ML19257D036

LER 80-004/03L-0:on 800106,during Startup Mode,Main Steam Line Inboard Isolation Drain Valve Failed in mid-position. Caused by Failure of Valve Motor Winding.Motor Replaced & Valve Returned to Operable Status

ML19257D036
Person / Time
Site:	Hatch
Issue date:	01/24/1980
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19257D035	List: ML19257D034 ML19257D036
References
LER-80-004-03L, LER-80-4-3L, NUDOCS 8001310253
Download: ML19257D036 (3)

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[o l3l l Line Inboard Isolation Drain Valve, IB21-F016, f ailed in the mid position. The out- l o 4 board iso 1ation valve, 1B21-F019, was verified to be operabic to insure that the l requirements of Technical Specification 3. 7.D.2 could be met. This was not a repeti-l lo Isl lo jcj ] tive occurrence and there were no ef fects to public health and safety.

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[TJTl l Investination of the problem revealed that the valve's motor winding had failed. Thel motor was replaced and the valve returned to an operabic status. The failure of the liJi]

i 2 l motor winding is believed to have been caused by moisture entering the motor f rom a i 3 ] Icaking bonnet pressure seal on the subject valve and f rom another valve located di- l i 4 1 rectly above this valve. The leaks were corrected prior to returning IB21-F016 (cont)l 80 7 8 9 F ACILIT* MrTHOOOF STATUS NPOWER OTHER ST ATUS DISCOVE RY DISCOVERY DESCniPTION 32 operator observation i s Clh lo l0 0l@l NA l l B l@l 80 l

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Ccorgia Power Company Plant E. I. Ilatch Baxley, Georgia 31513 Reportable Occurrence Report No. 50-321/1980-04 Cause Desdription and Corrective Actions (cont).

to an operable status.

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NARRATIVE REPORE Georgia Power Company Plant E. I. llatch Baxley, Georgia 31513 Reportable' Occurrence Report No. 50-321/1980-04 On J anuary 6, 1980, during the start-up mode of operation, the Main Steam Inboard Isolation Drain Valve, IB21-F016, failed to fully open. The valve was being opened, with the reactor power 1cvel at 6.8 MWt, to equalize around the Main Steam Isolation Valves. Due to the failure of the Inboard Valve, the Outboard Valve, IB21-F019, was verified to be operable to insure that the requirements of Technical Specification 3.7.D.2 could be met.

An investigation of the problem revealed that the valve motor had failed due to excessive moisture in the windings. The moisture appears to have come from a leaking bonnet pressure seal on the IB21-F019 valve and f rom another valve which is located directly above this valve.

The leaking valves were repaired and the 1B21-F016 valve motor replaced. The valve was then functionally tested and returned to service on January 7, 19 80.  !

l The cause of this occurrence was not of a repetitive nature and public health  !

an d safety were not effected. >

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