05000316/LER-1985-032-01, :on 851022,upper Containment Area Radiation Monitor Failed,Resulting in ESF Actuation Signal.Caused by Failure of Two Internal Electronic Modules.Failed Modules Replaced & Monitor Declared Operable

From kanterella
(Redirected from ML20137E701)
Jump to navigation Jump to search
:on 851022,upper Containment Area Radiation Monitor Failed,Resulting in ESF Actuation Signal.Caused by Failure of Two Internal Electronic Modules.Failed Modules Replaced & Monitor Declared Operable
ML20137E701
Person / Time
Site: Cook American Electric Power icon.png
Issue date: 11/21/1985
From: Lauren Gibson
INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:
Shared Package
ML20137E676 List:
References
LER-85-032-01, LER-85-32-1, NUDOCS 8511270296
Download: ML20137E701 (1)
v • d • e


LER-1985-032, on 851022,upper Containment Area Radiation Monitor Failed,Resulting in ESF Actuation Signal.Caused by Failure of Two Internal Electronic Modules.Failed Modules Replaced & Monitor Declared Operable
Event date:
Report date:
3161985032R01 - NRC Website
v • d • e

text

'

RC Form 30s U S NUCLEJA AEGULATOJiv COMMIS$10N APPROVED OMO NO 31M010e LICENSEE EVENT REPORT (LER)

'*"'S*2

D. C. COOK NUCLEAR PLANT, UNIT 2 olsl0lolo1311 6 1loFl0l1 ESF ACTUATION SIGNAL EVENT DATE ISI LER NUMBER (Si REPORT DATE 171 OTHER F ACILITIES INVOLVED B51 MONTH DAV YEAR YEAR 8'$$U ' A L atf,s$

MONTM DAY YEAR P Acouty NAwes DOC R E T NOUSE Ri$.

e 0 151010101 l l 1l0 2l 2 8

5 8l5 0l 3l 2 0l0 1l1 2 l1 8l5 o,5 t o, o, o i i,

TH18 REPORT 18 $USMITTED PUR$UANT TO THE REQUIREMENTS OF 10 CFR l- (Chece cae or more of,ae fo***al 1111 OPE R ATING "o **

3 m.02.i n.0.i.i X

+0 n' iaw i nmi 20 40si.Hui.i s0 m.im s0 ni. inh.i nmi.i 01010 20 0s Hm.i s0 m.ias sO nt.H2H i gMEgs,-gg noi 20 405 elHHahl SO 73(eH2Hei 50 73telaHumeH A)

JII6Al 20 40GisH1Htvi SO 73teH2Hal 90 73(eH2HvehHel 20 40steH11tvl 50 73teH2Hust to 73<aH2Hal LICENSEE CONTACT FOR THl$ LEh (121 NK.ME TELEPHONE NUUSER den E4 CODE L.

S.

GIBSON-TECHNICAL ENGINEERING SUPERINTENDENT 611 b 4 l 6 l5 l-l5 l 9 l0 l1 COMPLETE ONE LINE FOR EACM COMPONENT F AILURE DESCRISED IN THit REPORT 113)

M AC REP

  • L sLE

CAUSE

SYSTEM COMPONENT

CAUSE

Sv 5T E M COMPONE NT g

yO NPROS T E T NPRD5 X

Il L IM1OlN E 101710 Y

l

! i a 1 i f I

l I l l l I l

l l I l l 1

$UPPLEMENTAL REPORT e nPECTED 1948 UONTM DAY VEAR SL O U + 5SiON VES (If von remote,. EXPECTED suGMiS510N CA TEl NO l

l l

A T R ACT o~

,,x

....,.--., ~,

- n.. u., n..

ON OCTOBER 22, 1985, AT 1600 HOURS, WHILE IN HOT STANDBY (MODE 3), IT WAS FOUND THAT THE UPPER CONTAINMENT AREA RADIATION MONITOR (IEEE/ MON) HAD FAILED AT 1441 HOURS.

THE FAILURE CAUSED A MOMENTARY HIGH ALARM WHICH RESULTED IN AN ESF ACTUATION SIGNAL WHICH WOULD HAVE LED TO CONTAINMENT VENTILATION ISOLATION IF THE CONTAINMENT VENTILATION EQUIPMENT HAD BEEN IN SERVICE AT THE TIME.

THE EVENT REMAINED UNDETECTED FOR ONE HOUR AND NINETEEN MINUTES BECAUSE THE HIGH ALARM WAS MOMENTARY AND THERE WAS NO EQUIPMENT ACTUATION.

HAD THE CONTAINMENT PURGE SYSTEM FANS BEEN RUNNING AN ANNUNCIATOR WOULD HAVE BEEN RECEIVED WHICH WOULD HAVE REQUIRED OPERATOR ACKNOWLEDGMENT.

THE RADIATION MONITOR MALFUNCTION WAS THE RESULT OF THE FAILURE OF TWO INTERNAL ELECTRONIC MODULES (IEEE/IMOD) THAT SUPPLY THE 12 VOLT DATA ACQUISITION MODULE LOAD.

THE FAILED MODULES WERE REPLACED AND THE MONITOR WAS DECLARED OPERABLE NOVEMBER 5, 1985 AT 0851 HOURS.

REDUNDANT INSTRUMENTATION REMAINED OPERABLE.

THE HEALTH AND SAFETY OF THE PUBLIC WAS NOT AFFECTED.

A PREVIOUS SIMILAR OCCURRENCE WAS REPORTED IN LER 316/84-003.

%k1*$D$$ $

h6 S

i

.Uf'"* "*

Retrieved from "https://kanterella.com/w/index.php?title=05000316/LER-1985-032-01,_:on_851022,upper_Containment_Area_Radiation_Monitor_Failed,Resulting_in_ESF_Actuation_Signal.Caused_by_Failure_of_Two_Internal_Electronic_Modules.Failed_Modules_Replaced_%26_Monitor_Declared_Operable&oldid=4213584"