05000316/LER-1985-024-01, :on 850906,automatic ESF Actuation Occurred, Resulting in Reactor Trip Signal.Caused by Simultaneous Tripping of Two of Three Steam Generator 2 Level Channel Bistables.No Corrective Action Taken

:on 850906,automatic ESF Actuation Occurred, Resulting in Reactor Trip Signal.Caused by Simultaneous Tripping of Two of Three Steam Generator 2 Level Channel Bistables.No Corrective Action Taken

ML20133H320
Person / Time
Site:	Cook
Issue date:	10/07/1985
From:	Blind A INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:
Shared Package
ML20133H317	List: 05000316/LER-1985-024-01, :on 850906,automatic ESF Actuation Occurred, Resulting in Reactor Trip Signal.Caused by Simultaneous Tripping of Two of Three Steam Generator 2 Level Channel Bistables.No Corrective Action Taken 05000316/LER-1985-025-01, :on 850906,discovered That Reactor Trip Instrumentation Surveillance Requirements 4.3.1.1.1,Items 18B & 20 Inadequate.Cause Not Determined.Items Added to Computerized Nuclear Test Schedule for Reactor Startup ML20133H316
References
LER-85-024-01, LER-85-24-1, NUDOCS 8510170042
Download: ML20133H320 (2)

LER-1985-024, on 850906,automatic ESF Actuation Occurred, Resulting in Reactor Trip Signal.Caused by Simultaneous Tripping of Two of Three Steam Generator 2 Level Channel Bistables.No Corrective Action Taken

Event date:
Report date:
3161985024R01 - NRC Website

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Qi SEPnMER 6,1985, AT 0847 !!OURS, WInt UNIT 2 IN P10DE 5 (COID S11UID0hN), Ki At/IOMTIC DGINEEFID SAFEIY FEATURES (ESF) ICIUATION OCCURRED RESULTDG IN A RFJCIOR TRIP SIGNAL. TIE INITIATD:G EVDE WAS A IM-IM IEVEL DOICATION FO't STEAM GaiERATOR tD. 2.

'I1E IN STEVi GENERATOR IEVEL DiDICATION WAS TIIE RESULT OF SIMULTNiE00 SLY Th1PPING 2hD OF TIIE TIIREE STEAM GDIERNIOR NO. 2 LEVEL O!ANNEL BISTABLES. ONE OF 'I1IE CIANNELS, BLP-121, NAS TRIPPED b1 TILE PERIVTEING SURVEIILANCE TESTING. VIE OT!!ER OIN;NEL, BLP-122, liAD BEDI IN TIIE TRIPPED CONDITION SUJCE AUGUST 24, 1985, blini IT WAS RENNED FROM SERVICE FOR REPAIRS. 'I1E C0ffrROL ROOM STATUS LIGIT (INDICATIfX; 11!AT BLP-122 NAS IN 'I1E TRIPPED 00tDITION) IIAD BEEN PESUr CCtfrPARY 'IO ESTABLIS!!ED PIANT POLICY. CONSECUDELY, 'IllE TECIINICINI CONDUCTING 'I1E SURVEIIDWCE TEST IIAD NO WAY OF KNOWDiG 11%T Mt ESF ACIUATION WAS IMiINDU UKti TRIPPING BLP-121.

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'11E IN STEAM GDEPA'IOR LEVEL INDICATION KAS TIE RESULT OF SIMULTANEOUSLY TRIPPDC IWO OF 'IllE 'IIIREE STEAM GENERATOR NO. 2 LEVEL OIANNEL BISTABIES. ONE OF TIE CHANNELS, BLP-121, WAS TRIPPED Wi!ILE PERFORMING SURVEILIANCE TESTDC. TIE Cfl1IER QiANNEL, BLP-122, HAD BEEN IN 'ITE TRIPPED CONDITION SINCE AUGUST 24, 1985, h1IEN IT WAS REMOVED FROM SERVICE IVR REPAIRS.

IIIE SURVEILIANCE TEST INVOLVED (12 TIIP 4030 STP.ll5) RIU' IRES VERIFICATIQ1 TilAT NO STEAM GENERA 7OR LEVEL 13ISTABLES ARE IN 711E TRIPPID POSITIQ1 PRIOR '1D STAIGING TIE TFSr. 71 TIS VERIFICATION IS MADE 13Y DiSURING T!!AT TIE CORRESIQUING 00!ITROL ROCN STATUS LIGITS ARE NCfr ILLUMINATED. 'I1IESE STATUS LIGITS OPERATE OFF TIE " TEST DUECTION COVER" h11IGI MUST RD'AIN OPDi, PER ESTABLISIIFD PIAVP 10LICY, h11ILE TIIM CORRESPONDING BISTN3LE IS TRIPPED. IN 'I11IS INSTNG, 'I1E "TFSF INJECTIOT COVER *'

WAS CLOSED (WTI11 'I1E BISTABLE TRIPPFD) CLFARING TIIE STATTIS LIGIT. CONSIL'UENTIN, 11tE TEUINICIAN CONDUCTING TIE TEST !!AD NO WAY Ol' ENONING 'IllAT AN ESF ACIUATION WAS UNINDIT UPOJ TRIPPING BLP-121. AN INVESTIGATION OF 71E EVDTP COUID Nor DLTEININE hiiO S!!UT 71IE " TEST INJIX. TION 00VER".

SINCE ADlIERDICE 'IO ESTABLISIED PLANT POLICY WOUID IIAVE PREVFATED 71tE INCIDDir, N1D TIE INDIVIDUAL INVOLVED COUID Nor BE IDD.TIFHD, NO PREVDTTIVE ACTIQi hM TNEN.

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