ML20024B679

LER 83-051/03L-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

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: ML20024B673 ML20024B675 ML20024B679
References
LER-83-051-03L-01, LER-83-51-3L-1, NUDOCS 8307110209
Download: ML20024B679 (2)

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• fvRC FOria 046 U. S. NUCLEAR REGULATORY COMMISSION (7 77)

LICENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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lh FITl8IM i 9 II LICENSEE I D I cCODE i cl 21@lo lo l- I o lLICENSE 14 15 o I oNuv8ER I o l 01 -l of ol@l41111 2b 26 l 11 il@l $7 CATb8 LaCENSE TYPE JO I l@

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REPORT DATE 80 7 61 DOCKET NUV8ER 69 1 I

EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h

[TTTl IDURING SURVEILLA?CE TESTItG ON TIE MAIN TURBINE STOP VALVES, TIE RESET FU?CTION EOR l 0 3 l TIE PROXIMITY SWITCH ON STOP VALVE C, TRAIN B, FAILED 'IO OPERATE IttEDIATELY. TIE l 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. THE ACTTON R mUIRE-l lTTTl iMEIES WERE MET. PUBLIC IEALTH AfD SAFETY WERE TUT Ar'en;rts. PREVIOUS OCLNRKEtCES l 0 a I I?CLUDE: 050-316/78-025, 077,79-008, 81-060,83-035. i DE CODE SUBC E COMPONENT CODE SU8 CODE 5 E O 9 I II Al@ (B_J@ l A l@ II l N l S l T l R l U lh [_I_j@ [Z.j @

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_ SEOVENTI AL OCCURRENrE REFORT REvlSION LE a 'RO EVENT YEAR REPORT NO. CODE TYPE NO.

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JJ 34 35 36 37 40 41 42 43 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l i l o l ] TIE PROXIMITY SWITCII, MANUFACTURED BY NAMCO CONTROLS WAS REPLACED AS A PRECAUTIONARY E IMEASURE, VERIFIED 'IO WORK CORRECTLY AfD RETURNED 'IO SERVICE. TIE CAUSE OF THE ATNI i 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. (SEE ATTACIED SUPPLINEFE) l 7 8 9 80 STA 5  % POWE R OTHER STATUS 15 0 PY DISCOVERY DESCRIPTION FGT1 LnJ@' liI o I o181" m I I B l@l SURvEIntAICE TEST

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' ' ' PERsONNE'LiN;UJEs ' ' 80 8307110209 830629 muMnER DESCRIPTION 8 PDR ADDCK 05000316 m PDR 0

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i o Laj@l nA I 7 8 9 to 80 2 o t @ lDESCRIPTION m st3s i liiiiiiiiiiil!

1. 4 3- 10 68 69 80 5 NAVE OF PREPARER PHON E :

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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