05000316/LER-1983-051-03, /03L-0:on 830604,reset Function for Proximity Switch on Stop Valve C,Train B,Failed to Operate Immediately & Made Inoperable for Replacement.Caused by Input Bay Relay in Solid State Protection Sys Dropping Too Much Voltage

/03L-0:on 830604,reset Function for Proximity Switch on Stop Valve C,Train B,Failed to Operate Immediately & Made Inoperable for Replacement.Caused by Input Bay Relay in Solid State Protection Sys Dropping Too Much Voltage

ML20024B679
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: 05000316/LER-1983-051, Forwards LER 83-051/03L-0 & Updated LER 83-035/03X-1 05000316/LER-1983-051-03, /03L-0:on 830604,reset Function for Proximity Switch on Stop Valve C,Train B,Failed to Operate Immediately & Made Inoperable for Replacement.Caused by Input Bay Relay in Solid State Protection Sys Dropping Too Much Voltage
References
LER-83-051-03L-01, LER-83-51-3L-1, NUDOCS 8307110209
Download: ML20024B679 (2)

LER-1983-051, /03L-0:on 830604,reset Function for Proximity Switch on Stop Valve C,Train B,Failed to Operate Immediately & Made Inoperable for Replacement.Caused by Input Bay Relay in Solid State Protection Sys Dropping Too Much Voltage

Event date:
Report date:
3161983051R03 - NRC Website

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[TTTl IDURING SURVEILLA?CE TESTItG ON TIE MAIN TURBINE STOP VALVES, TIE RESET FU?CTION EOR l l TIE PROXIMITY SWITCH ON STOP VALVE C, TRAIN B, FAILED 'IO OPERATE IttEDIATELY. TIE l 0 3 lo i4 l l TRIP FUfCTION OF TIE PROXIMITY SWITCH WAS VERIFIED TO OPERATE PROPERLY. TIE PROX-l l o I s l IIMITY SWITCH WAS MADE INDPERABLE FOR REPLACIMENT. THIS EVEtE WAS ION-COtEERVATIVE l 1 o is i IWITH RESPECT 'IO TECHNICAL SPECIFICATION TARTR 3.3-1 TTEM 19.b.

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3 l RESET TIME OF TIE PROXIMITY SWITCIES ( AS INDICATED BY TPR 050-316/83-035) HAS RRRN l y lIDEtEIFIED. TIE INPUT BAY RELAY IN TIE SOLID STATE PROTECTION SYSTEM DROPS 200 Mt.CH U_1.4_1 1 \\0LTAGE FOR TIE PROXIMITY SWITCH TO RESET I?+EDIATELY.

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ATTACINENT 'IO LER #83-051/03L-0 SUPPLINENT 'IO CAUSE DESCRIPTION THE PROXIMITY SWITH, MANUFACTURED BY NAMCO CONTROLS WAS REPLACED AS A PRECAtTfIONARY MEASURE, VERIFIED 'IO WORK COtociLTLY AND RETURNED 'IO SERVICE.

TIE CAUSE OF TIE SIN RESET TIME OF TIE PROXIMITY SWI'ICIES (AS IlOICATED IN LER 050-316/83-035) HAS BEEN IDENTIFIED. TIE INPITI BAY RELAY IN TIE SOLID STATE PROIECTION SYSTIM DROPS 'IOO MUCH VOLTAGE FOR TIE PROXIMITY SWI'ICH 'IO RESET I!HEDIATELY. A DESIGN CHANGE HAS BEEN REQUESTED 'IO CORRECT THIS PpnRTJM, 4

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