ML17261A188

LER 80-004/01T-0:on 800506,during post-installation Test of Reactor Vessel Head Vent,Dc Power Switches for Both Trains of Low Temp Overpressurization Protection Found in Off Position W/No RCS Vent Open.Cause Unknown

ML17261A188
Person / Time
Site:	Ginna
Issue date:	05/19/1980
From:	PECK C H ROCHESTER GAS & ELECTRIC CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML17249A916	List: ML17249A915 ML17261A188
References
LER-80-004-01T, LER-80-4-1T, NUDOCS 8005230528
Download: ML17261A188 (6)

Text

U.S.NUCLEARREGULATORY COMMISSION NRCFQRM368I7-77Lrp80-004/01T-0 LICENSEEEVENTREPORTtoD1j78CON'T~o78~o(CAR1264)Q1(PLEASEPRINTORTYPEALLREQUIREDINFORMATION) 60-00000-00Q341111QE~QELICENSENUMBER2526LICENSETYPE3057CAT56CONTROLBLOCK:INYREG1Q209LICENSEECODE1415~LLQB0500024470506S0B051980QQBSOURCE6061DOCKETNUMBER69EVENTDATE7475REPORTDATE80EVENTDESCRIPTION ANDPROBABLECONSEQUENCES QIODuringpostinstallation testofreactorvesselheadvent,DCpowerswitchesforbothtrainsoflowtemp.overpressurisation protection (OPPS)werefoundinOFFpositionwithnoRCSventopen.(T.S.3.15)Systemhadbeenchargedandoperableasloggedearlier,notedopen10hrs.laterduringinspection forabovetest,closedfortestand~osreoPened.

Switcheswerereclosedafternotification ofcondition.

Slumshadbeenlockedoutandloop-SGtemps~werenearlyequalsothatpotential causesofoverpres-

\suretransients wereminimized andnohazardous consequences resulted.80789[oO~)78Iwithnorecordofkeyorholdassignment.

Procedure 0-7Alignment andOperation oftheReactorVesselOverpressure Protection Systemwasamendedtoaddverification SYSTEMCAUSECAUSECOMP.VALVECODECODESUBCODECOMPONENT CODESUBCODESUBCODE~CBQIIXQI2~ZQI3CKTBRKQI4~EQIs~ZQIs910111213161920SEQUENTIAL OCCURRENCE REPORTREVISIONLERiROEVENTYEARREPORTNO.CODETYPENO.Q17REPORT~80~~004~~~01~T~02122232426272829303132ACTIONFUTUREEFFECTSHUTDOWNATTACHMENT NPRDPPRIMECOMP.COMPONENT TAKENACTIONONPLANTMETHODHOURS+2>SUBMITTED FORMSUB.SUPPLIERMANUFACTURER QI8~+QIE~ZQEO~ZQ20~Q23pJQ24pJQ25120Q283334353637404142434447CAUSEDESCRIPTION ANDCORRECTIVE ACTIONSQ2IoShiftpersonnel wereguesttoned onDCpanelkey;stationholdrecordwaschecked,thatDCpowerswitchesareclosedpriortoputtingOPPSinservice.4789FACILITYSTATUS%POWER5~GQ28~000Q28789101213ACTIVITYCONTENTRELEASEDOFRELEASEAMOUNQQQ~ZQ33ZQ37891011PERSONNEL EXPOSURES NUMBERTYPEDESCRIPTION Q392~000Q32~ZQ38NA789111213'ERSONNEL INJURIESNUMBERDESCRIPTION Q8~000Q4oNA7891112LOSSOFORDAMAGETOFACILITYQ43TYPEDESCRIPTION ZQ42NA8910PUBI.ICITY

~>>~%Q447891080804580808080NRCUSEONLYo80o0a5005230P2-)4INA6869PHDNE315/524-4446 CarlH.PeckNAMEOFPREPARERMETHODOFOTHERSTATUS~DISCOVERY DISCOVERY DESCRIPTION Q32NA~CQ3ISoundofOPPSventingafterventtest4445TOFACTIVITYQLOCATIONOFRELEASEQNANA

Attachment tcLERl04/01T-0 Rochester GasandElectricCorporation R.E.GinnaNuclearPowerPlant,UnitNo.1DocketNo.50-244OnMay6,1980duringperformance ofpostinstallation hydrostatic pressuretestingofthereactorvesselremotelyoperatedheadventsystemitwasfoundthattheDCswitcheswhichsupplypowertobothtrainsofthelowtemperature overpressurization protection controlofthepressurizer poweroperatedreliefvalveswerefoundintheOFFposition, withnoReactorCoolantSystemventopenasrequiredbyTechnical Specification 3.15whenthesystemtemperature islessthan330F.Thiswasdiscovered whentheOperations Supervisor, duringatourofcontainment, investigated thesoundofventingfromthenitrogensystemforthepoweroperatedreliefvalves.Areviewofpreviousactivities showedthatat0115hoursthatmorn-ingprocedure S-29.2"Charging theReactorVesselOverpressure Protection SystemAccumulators withN2"wasperformed.

TheDCsupplyswitchesmustbeclosedtoallowthenitrogentochargetheseaccumulators.

At1115hoursamemberoftheResultsandTestGroup,inpreparing forthehydrostatic pressuretestofthenewlyinstalled headventsystem,notedthattheseswitcheswereopen,butwasnotawarethatthemodification beingtestedhadbeenaddedtothesamesourceofpowersupplying theoverpressure pro-tectionsystem.At1400hoursamemberoftheResultsandTestGroupinsertedfusesandclosedtheswitchesinordertoperformthehydrostatic pressuretestoftheheadventsystem,andaftercompletion reopenedtheswitchesandremovedthefuses.Thisresultedinventingoftwosmallnitrogenaccumulators intheoverpressure protection system,heardbytheOperations Supervisor.

AfterhenotifiedtheControlRoomofthecondition, thesystemwasrestoredtooperability, andatthattimeitbecameknownthatboththeoverpressure protection systemandtheheadventsolenoidvalvesarepoweredbythesameDCswitches.

Thelowtemperature overpressure protection systemwasprovidedtoinsurethattemperature-pressure requirements inconsideration ofreactorvesselfracturetoughness arenotexceeded.

Infurtherrecognition oftheserequirements thecontrolswitchesforthesafetyinjection pumpswereinthePULL-STOP positionandthereactorcoolant-steam generator temperature differences werevirtually zerosothatpotential causesofoverpressure transients wereminimized andnohazardous consequences resulted.

TheDCpowerswitcheswouldhavebeenreturnedtothecorrectpositionuponcompletion'of workontheheadventsystem.Thepersonnel onthenightshiftanddayshiftwerequestioned aboutwhowasgiventhekeyfortheDCpanel.Theonlypersonswhotheyremem-beredgivingthekeytowerethetwotestindividuals mentioned above.How-ever,sincethekeyiscommontoseveralelectricpanels,itispossiblethatotherkeysareavailable.

Theoperators donotrecallseeingotherpersonnel intheDCpanels.

Attachment tcLER804/01T-0 Thestationholdrecordswerechecked.TheswitcheswererestoredtoserviceonMay2,1980,withnootherholdsperformed onthissystemsincethatdate.Procedure 0-7Alignment andOperation oftheReactorVesselOver-pressureProtection Systemwasmodifiedtorequireverification thattheDCpowerswitchesareclosedpriortoputtingthesystemintoservice.ThelocksfortheDCpanelswillbechangedinordertolimitthedistribution ofkeystopreventrecurrence.

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