05000316/LER-1985-018-01, :on 850820,ESF Actuation Occurred.Caused by Opening of Reactor Trip Breakers During Instrumentation Checks.Surveillance Test Procedure Thp 4030 STP.180 Revised

:on 850820,ESF Actuation Occurred.Caused by Opening of Reactor Trip Breakers During Instrumentation Checks.Surveillance Test Procedure Thp 4030 STP.180 Revised

ML20135J021
Person / Time
Site:	Cook
Issue date:	09/19/1985
From:	Blind A INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:
Shared Package
ML20135J018	List: 05000316/LER-1985-018-01, :on 850820,ESF Actuation Occurred.Caused by Opening of Reactor Trip Breakers During Instrumentation Checks.Surveillance Test Procedure Thp 4030 STP.180 Revised 05000316/LER-1985-019-01, :on 850821,determined That Seismic Qualification of Governors for turbine-driven Auxiliary Feed Pumps Inadequate for Approx 4 Yrs.Cause Not Stated.Governors as Installed Meet Current Seismic Requirements ML20135J017
References
LER-85-018-01, LER-85-18-1, NUDOCS 8509250141
Download: ML20135J021 (1)

LER-1985-018, on 850820,ESF Actuation Occurred.Caused by Opening of Reactor Trip Breakers During Instrumentation Checks.Surveillance Test Procedure Thp 4030 STP.180 Revised

Event date:
Report date:
3161985018R01 - NRC Website

text

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F ACILITY NAME til DOCKET NUMGER i21 PAGE i3i D.C. COOK NUCLEAR PLANT, UNIT 2 o l5 l 0 [o I o i31116 1lOFlOl1 TITLE (48 ESF ACTUATION - REACTOR TRIP SIGNAL EVENT DATE ten LER NUMeER iss REPORT DATE 17 OTHER F ACILITIES INVOLVED 101 MONTH DAv vtAR vtAR sagg,A6 aeysg

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ON AUGUST 20,1985, AT 2250 HOURS WITII UNIT 2 IN MODE 3 (HOT STANDBY), AN ESF ACIUATION OLUummu h11EN THE REACIOR TRIP BREAKERS OPENED hyTTR CONDUCTING INSTRLHEtEATION CHECKS PRIOR 'IO S'IARTUP.

NORMAILY THE REACIOR TRIP BREAKERS ARE OPEN WHTTR PEREORMING 'IIIIS SURVRTTJANCE TEST, HOWEVER, IN THIS INSTANCE THEY WERE CIOSED AND SUBSEQUENTLY OPENED UFCN PECEIPT OF A TRIP SIGNAL.

'IO PREVENT REGRRENCE, THE APPLICABIE SURVEILIANCE TEST PROCEDUPE (THP 4030 STP.180) HAS BEEN REVISED 'IO REQUIRE 'IIIE N(7fIFICATION OF OPERATIONS PERSONNEL 'IllAT A REAC'IOR TRIP SIGNAL WIIL BE GENERATED DURIIK; THE COURSE OF THE TEST.

A SIMILAR OLUumtNCE KAS REPOICED IN LER 50-316/84-32.

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