ML20024B675

Updated LER 83-035/03X-1:on 830319,trip Function of Proximity Switch Made Inoperable for Replacement,Resulting from Failure of Main Turbine Stop Valves on 830312.Caused by Relay in Solid State Protection Dropping Too Much Voltage

ML20024B675
Person / Time
Site:	Cook
Issue date:	06/29/1983
From:	Palmer R INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20024B674	List: ML20024B673 ML20024B675 ML20024B679
References
LER-83-035-03X, LER-83-35-3X, NUDOCS 8307110200
Download: ML20024B675 (1)

Text

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E dl015101010131 il 6l@l0131119 l 8131@l01612191813 l@ 74 75 80 7 8 60 61 DOCK E T NUMBE R 68 69 EVENT DATE REPORT D ATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h O 2 l DURItC SURVEILIAICE TESTItG ON TIE MAIN TURBIIE STOP VALVES ON 3-12-83, TIE RESET l o 3 1 FU?CTION FOR TIE PROXIMITY SWITCH ON STOP VALVE 0, TRAIN B, FAILED TO OPERATE I l0l4l l I?NEDIATELY. TIE TRIP FU?CTION OF TIE PROXIMITY SWITCH WAS MADE INOPERABLE FOR l 1 o I s i I REPLACIMENT ON 3-19-83. THIS EVENT IS FDN-CONSERVATIVE WITH RESPECT TO TECHNICAL I I o l6 I I SPECIFICATION TABLE 3.3-1 ITEN 18.b. TIE ACTION REOUIREMENTS WERE MET. TIE l

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i l o l l TIE PROXIMITY SWITCH, MANUFACTURED BY NAMCO CONTROLS, WAS REPLACED, VERIFIED TO I I i l i l 1 TORK CORRII' PLY AfD RETURNED 10 SERVICE. TEE CAUSE OF TIE SIf)W RPRP TIME OF THE I i = l PROXIMITY SWITCIES HAS BEEN IDENTIFIED. TIE INPUT BAY REIAY IN TIE SOLID STATE I L'_LLJ l PROPDCTION SYSTEM DROPS 400 MirH VOI!PAGR FOR THE PROXIMITY SWI70H 'IO RPRPT IMME- l g l DIATELY. A DESIGN CHANGE HAS REEN REQUESTED TO CORRECT THIS PROBLEM. 1 i 8 9 80 57 5  % POWE R OTHER STATUS dis O R DISCOVERY DESCRIPTION IiisI'd' @ l1 10 10 "l@lta l lBl@lSURVEILLANCETEST I

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