05000315/LER-1985-044, :on 850902 & 07,steam Line Isolation Signal Generated ESF Actuation.Caused by solid-state Protection Sys Design Change Installation & Valving Out Instrumentation Lines,Respectively.No Corrective Action Taken

:on 850902 & 07,steam Line Isolation Signal Generated ESF Actuation.Caused by solid-state Protection Sys Design Change Installation & Valving Out Instrumentation Lines,Respectively.No Corrective Action Taken

ML20133D794
Person / Time
Site:	Cook
Issue date:	10/02/1985
From:	Blind A INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:
Shared Package
ML20133D777	List: 05000315/LER-1985-044, :on 850902 & 07,steam Line Isolation Signal Generated ESF Actuation.Caused by solid-state Protection Sys Design Change Installation & Valving Out Instrumentation Lines,Respectively.No Corrective Action Taken ML20133D773
References
LER-85-044, LER-85-44, NUDOCS 8510090184
Download: ML20133D794 (2)

LER-1985-044, on 850902 & 07,steam Line Isolation Signal Generated ESF Actuation.Caused by solid-state Protection Sys Design Change Installation & Valving Out Instrumentation Lines,Respectively.No Corrective Action Taken

Event date:
Report date:
3151985044R00 - NRC Website

text

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13STm ACT IL* r er 'ex apeces e e edere=~eae r "wea sea, e spece rope. rfea *asee 41 66 ON SEP"' EMBER 2,1985, AT 2240 HOURS AND AGAIN ON SEPTEMBER 7,1985, AT 0140 HOURS WITH UNIT 1 IN 10DE 5 (OXD SHUID%N) A STEAM LINE ISOIATION SIGNAL KAS GENERATED

- AN ENGINEERING SAFETY FEATUPE (ESP) ACIUATION.

TIIE SEPTEMBER 2,1985, EVENT WAS 71IE RESULT OF SURVEIIlANCE TESTING ON TIIE SOLID 1

STATE PROIECTION SYSTEM ACCmPANIED WITH A STANDING STEAM LINE ISOIATIm SIGNAL, PRIOR TO TESTING. THE STANDING STEAM LINE ISOIATION SIGNAL KAS TIE CONSEQUENCE OF A DESIGN CIANGE INSTAILATION.

'IEE SEPTEMER 7,1985, EVENT WAS THE RESULT OF VALVING OUT INSTRUMENTATION LINES l

TO INSPECT COMPRESSICH FITTINGS DURING TIE INSTALIATION OF TIE SAME DESIGN OIABKE REFERENCED EAPLIER. TIE VALVING OUP OF T!!E INSTRUMENTATION LINES GENEPATED SIGNALS EUR A STEAM LINE ISOIATION.

SINCE TIE PRIMARY CAUSE OF FX7111 EVDRS CAN DE A'ITRIBUTED 10 '11IE INSTALIATION OF A i

SPECIFIC DESIGN OfANGE AND T!!E DESIGN OfANGE REFERENCED IS NUr EXPECTED 'ID BE OF A I

REPETITIVE NA'IURE, NO CORRECTIVE OR PREVDRIVE ACTION WAS TAKEN.

THE STEAM LINE ISOIATION SIGNAIS WERE NOT 71[E RESULT OF ACTUAL PIRR CONDITIONS OR PARAMETERS SATISFYING THE REQUIREMEtRS EVR AN ESF INITIATION, CONSEQUENTLY IT IS l

CONCTl]DED 'IIIAT TIIE IEAI!Ill AND SAFLTY OF 11IE PUBLIC WERE NOP Atmame 1

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e, mannm ON SEPrmBER 2,1985, AT 2240 llOURS AND AGAIN ON SEPTEMBER 7,1985, AT 0140 llOURS WIT!! UNIT 1 IN MODE 5 (COLD SHUTDOWN) A STEAM LINE ISOIATION SIGNAL KAS GENERATED

- AN ENGINEERING SAFLTY FEATURE (ESF) ACIUATION.

TiiE SEPTDGER 2,1985, EVDE WAS TIE RESULT OF SURVEILIANCE TESTING ON TIE SOLID STATE PIUTECTION SYSTD1 ACCCEPANIED WI'I11 A STANDING STFAM LINE ISOIATION SIGNAL, PRIOR TO TESTING. TIIE STANDING STEAM LINE ISOLATION SIGNAL KAS TiiE CCNSEUJENCE OF A DESIGN CHANGE INSTALIATION. TIE MAIN STEAM LINE ISOIATION SIGNAL IS GENERATED BY HIGH STFAM FIM ON 1 OF 2 OIANNEIS ON 2 OF 4 STEAM GENERATORS COINCIDELT WITII Im STEAM LINE PRESSURE OR ID-IO TAVG. IN TilIS CASE, 71E ACIUATIW SIGNAL h%S Fim HIGI STFAM FIEW COINCIDDR WIT!! Im STEAM LINE PRESSURE. IN MCOE 5,11E STEAM LINE PRESSURE IS ZERO, UEREFORE, TIIIS PORTION OF TIE SIGNAL h%S PADE UP. TIIE IIIGH STEAM FIDW SIGNALS hERE " STANDING" ON IOOPS 1 AND 3 FTCM A DESIGN OfANGE INSTALIATION.

h1IEN SURVEILIANCE TESTING BEGAN ON AUGUST 26,1985, 71IE STANDING STEAM LINE ISOIATION SIGNAL KAS RESF1r AS TEST SIGAIS hERE INPUT. UPON RD0VING TIIESE TFST SIGNAIS, TIE STEAM LINE ISOIATION IOGIC hENT BACK TO TIE PRETEST STATUS RESULTING IN TIE REINITIATION OF A STEAM LINE ISOIATION. SUCE 11E MAIN STFAM ISOIATION VALVES hEFE ALREADY CIOSED, 'I1E ONLY PLANT RESPCNSE W\\S TIE OPENING OF TIE STEAM LINE ISOIATION DUMP VALVES.

TIE SEPTmBER 7,1985, EVDJT WAS TIE RESULT OF VALVING OUT INSTRUMENTATION LINFE2 70 INSPECT COMPRESSICN FITTINGS DURDJG TIE INSTALIATION OF T!!E SAME DFSIGN OIANGE i<rm<tNCED EARLIER. TIE VALVING OUT OF '11IE INSTRUMENTATION LDES GENERATED SIGNAIS FOR A STEAM LINE ISOIATION. AGAIN 'IllE PAIN STFAM ISOIATION VALVES WERE ALREADY CIOSED AND TIE ONLY PLANT RESPONSE NTE2 THE OPDJDIG OF TIIE STEAM LINE ISOIATION DUMP VALVES.

SDEE TIE PRIMARY CAUSE OF DOI 11 LVDES CNi BE ATTRIBUTED TO TIE DJSTAIJATION OF A SPECIFIC DESIGN OIANGE AND TIE DESIGN CIANGE PEFERENCED IS NOP EXPECTED TO BE OF A REPETITIVE NATURE, NO CORRIITIVE OR PREVDEIVE /CTION h%S TAlEN.

TIE STFAM LINE ISOIATION SIGNAIS hERE NOT TIE RFSULT OF /CIUAL PIAtTT CONDITIONS OR PARAMLTERS SATISFYING THE REQUIRDENTS FOR AN ESF INITIATION, CONSEQUDTTLY IT IS CONCLUDED TIIAT TIE IEALTI AND SAFLTY OF TIE PUBLIC hERE Nor AmA;nu.

PREVIOUS OCCURRENCE OF A SIMIIAR NATURE NAS REPORTED IN LER 50-316/85-14.

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