ML17212B425

Draft off-normal Operating Procedure 0120037, Reactor Coolant Gas Vent Sys Off-Normal Operation.

ML17212B425
Person / Time
Site:	Saint Lucie
Issue date:	03/02/1982
From:	FLORIDA POWER & LIGHT CO.
To:
Shared Package
ML17212B424	List: ML17212B423 ML17212B425
References
0120037, 120037, NUDOCS 8203050249
Download: ML17212B425 (23)

Text

Page1of20FLORIDAPOWER&LIGHTCOMPANYSTeLUCXEPLANTUNITNO.1OFF-NORMALOPERATINGPROCEDURENO.0120037REVISION01.0Title:ReactorCoolantGasVentSystemOff-NormalOperation2.0ReviewandApproval:ReviewedbyFacilityReviewGroupApprovedbyPlantManager1919RevisionReviewedbyFRGApprovedbyPlantManager19193.0PurposeandDiscussion:3.1Thepurposeofthisprocedureistoprovideamethodofventingnon-condensiblegasesfromtheReactorCoolantSystem(RCS)whichmayinhibitcorecoolingduringnaturalcirculation.3.2Guidanceandprecautionsarealsoprovidedforuseindeterminingthesizeofthenon-condensiblevoidformation,whentoinitiateventing,andterminationofventingoperations.4.0Symptoms:4.1AbnormalRCSconditionssuchaslargevariationsinpressurizerlevelduringnormalchargingandsprayingoperationshaveoccurred.4.2Ifavailable,reactorvesselheadtemperaturesequaltoorgreaterthansaturationtemperature.4.3Planteventshaveoccurred(suchassafetyinjectiontankfSIT}discharge,rapidRCScooldown,orcoreuncoveryevents)thatmayresultinthepresenceofagaseousvoidinthevesselhead.4.4Lossofpressurizerpressurecontrolduringnormalpressurizerconditio~s(i.e.,bubbleestablished,normalheaters/spraycapabilities).4.5Pressurizerindicatesdeparturefromsaturatedconditionsi.e.,foragiventemperature,pressureishigherthansaturationpressure.8203050249820302PDRADQCK05000335PPDR

',~~1Y~j+hij Page2of20(OFF-NORMALOPERATINGPROCEDURENO.0120037,REVISION0REACTORCOOLANTGASVENTSYSTEMOFF-NORMAL.OPERATION5.0Instruetions:5.1.ImmediateAutomaticActions:DRAFTNone5.2ImmediateOperatorActions:5.2.1Ifanyoftheabovelistedsymptomshaveoccurredoritissuspectedthatthereisanon-condensiblevoidformationpresentintheRCSbyotherdetectionmeans,thenanychangesbeingmadetotheprimarysystemshouldbeterminatedandasteadystateconditionshouldbeestablished.5.3SubsequentOperatorActions:Note:Asteriskedstepsarenotapplicableifsafetyinfectionhasbeeninitiated.5.3.1AttempttorecombineanycondensiblegasesbyincreasingRCSpressurethroughtheuseofpressurizerback-upheaters.Ifthisstepissuccessfulincondensingthegasvolumeinthevesselhead(asindicatedbyareturntonormalreadingsinthoseparametersusedtodetermin'ethepresenceofthegases)thenreturntotheappropriateoperatingprocedures.5.3.2Coordinatewithappropriateon-sitetechnicalresources.(TechnicalSupportCenter[TSClSupervisorifmanned;ChemistryDepartmentrepresentativeifTSCisnotmanned).5.3.3Determinethemagnitude/sizeofthevoidformationperAppendix.B,ifpossible.5.3.4DeterminetherecommendedventingtimerequiredperAppendixC,ifpossible.5.3.5IncreasetheRCSsub-coolingto50oF+inaccuraciesbyeitherpressurizingviapressu'rizerbackupheatersordecreasingRCStemperatureviadumpingsteam.5'3.6Terminatecontainmentpurge,ifinprogress.Startallavailablecontainmentcoolers.5.3.7Ensurethat.allavailablehydrogenrecombinersareinservice.5.3.8VerifythatChemistryDepartmentispreparedformonitoringthecontainmentatmosphereforhydrogenviathehydrogenanalyzerand/orgrabsample.5.3.9Increasepressurizerlevelto80-85%inpreparationforventing.Thisshouldprovideinventorytodisplaceapproximately900ft3beforereachingheaterlevel.

IPage3of20OFF-NORMALOPERATINGPROCEDURENO.0120037,REVISION0REACTORCOOLANTGASVENTSYSTEMOFF-NORMALOPERATION5.0Instructions:(continued)'~5.3(continued)DRAFT5.3.10Ifnotalreadyperformed,manuallyblockSIASifthepermissiveisenergizedduringtheventingprocess.'.3.11RestorepowertotheRCGVSsolenoidoperatedValvesbyinsertingfuses26F2&4and11F2&4.C.R.A.C.PANEL1llF2&4C.R.A.CoPANEL226F2&4V-1442V-1444V-1445V-1449V-1441V-1443V-14465.3.12Monitorpressurizerpressureandlevelduringtheventingperiodandminimizethepressureandleveldecreasebyselectiveuseofchargingpumpcombinationsandletdownflow.5.3.13Observethepressurizerleveltrendduringthereactorvesselventingand,fromthefollowingconditions,determinetheprobablestatusofthereactorcoolantsystem:a.Controllablepressurizerlevel-gaseousvoidsexistintheRCSotherthanthereactorvesselheadorpressurizer.Theorificeintheheadventissizedtolimitwaterrelieftowithinthemake-upcapabilityofonechargingpump(44GPM82250psia).Therefore,ifnogasesarepresentinthevesselhead,thenthepressurizerlevelshouldremaincontrolable.b.Decreasingpressurizerlevel.-gaseousvoidsexistinthereactorvesselhead.Theventingofgaseswillresultinarapiddecreaseinpressurizerlevelduetothemassflowrateofthegasesbeinggreaterthanthemassinputbeingprovidedbythechargingsystem.rCAUTION:Ifpressurizerleveldecreasestolessthan20%,thenattempttorestorelevelbytheCVCSSystem(isolateletdown,max.charging).Iflevelcannotberestored,thenmanuallyinitiatesafetyin)ection.

Page4of20OFF-NORMALOPERATINGPROCEDURENO.0120037,REVISION0REACTORCOOLANTGASVENTSYSTEMOFF-NORMALOPERATION/5.0,Instructions:(continued)'<.5.3'(continued)jRAB5.3.14Commenceventingthereactorvesselhead.Theflowpathusedisoptional,andthedecisionastowhichisusedshouldbebasedonquantityofgastobereleased.Ifrecoveryandprocessinginthewastegassystemisdesired,thenventtothequenchtank.Ifquantityislarge,thenventtocontainmentatmosphere.5.3.15Terminateventingwhen:a.TIMEPERIODDETERM1NEDINSTEP5.3.4ISMET,ORboPRESSURIZERPRESSUREDECREASESBY200PSIyORc.PRESSURIZERLEVELDECREASESBELOW25XLEVEL,ORd.REACTORCOOLANTSUBCOOLINGLESSTHAN20oF+INACCURACIES,ORe.THEREACTORVESSELHEADISREFILLEDASINDICATEDBYADECREASEINTHERATEOFCHANGEOFPRESSUREANDPRESSURIZERLEVELS5.3.16Re-establishpressurizerlevelandevaluatetheresponseofthepressurizerleveltrendtodetermineifagasbubbleexistedinthehead.Ifagasbubbleexistedandtheventingwasterminatedpriortothevesselbeingcompletelyrefilled,thenreturntoStep5.3.14.Note:Ifmultipleventingoperationsarerequiredandthecontainmenthydrogenconcentrationisequaltoorgreaterthan3volumepercent,thenprovisionsmustbemadetoremoveorreducethevolumeofhydrogenfromthecontainmentpriortore-openingthereactorvesselheadvent.5.3.17Returntotheappropriateoperatingproceduresfollowingsuccessfulcompletionoftheventingofthereactorvesselhead.

Page5of20OFF-NORMALOPETINGPROCEDURENO.012003,REVISION0REACTORCOOLANTGASVENTSYSTEMOFF-NORMALOPERATION6.0

References:

6.1C-E"FinalReportontheReactorCoolantGasVentSystem"..7.0Records:7.1CompletedAppendixBandCworksheetsshallberetainedintheplantfileinaccordancewithQI-17/PSL-1.

Page6of20OFF-NORMALOPERATINGPROCEDURENO.0120037,REVISION0REACTORCOOLANTGASVENTSYSTEMOFF-NORMALOPERATIONAPPENDIXAPRECAUTIONS1.Thisventingprocedureshouldnotbeusedas'theprimarymeanstomitigateaninadequatecorecoolingevent.2.VentingoperationsshouldbeperformedpriortotheinitiationofsafetyinjectionflowthrottlingduringaPost-Locacooldownanddepressurization.Duringventing"fullflow"SIcapabilitiesmustbe.maintainedifneeded.3.Donottripanyrunningorstartanynon-operatingreactorcoolantpumpsduringventingoperations.4.Containmentpurgeshouldbeisolatedtopreventthereleaseofanyradioactivegasestotheenvironment.5.Allavailablecontainmentaircirculationequipmentshouldbestartedtopreventanyhydrogenfromformingagaspocketandtoensurearepresentativehydrogenconcentrationisobtainedduringsampling.6.AppendixC"VentingTimePeriod"determinesthemaximumallowabletimeperiodforventingwhichwilllimitthecontainmenthydrogenconcentrationtolessthan3volumepercent.

Page7o20OFF-NORMALOPER.NGPROCEDURENO.'0120037~EVISION0.REACTORCOOLANTGASVENTSYSTEMOFF-NORMA&OPERATIONAPPENDIXBNON-CONDENSIBLEVOIDFOE'LATIONSIZINGPage1of3DRAFT1.0TheobjectiveofthistestistoinjectaknownvolumeofboratedwaterintotheRCSandthencomparetheexpectedresultswiththeactualresults.E20Ifthesafetyinjectionsystemisinservice,thenthefollowingstepsarenotapplicablesincenormalpressurizercontrolwillnotbemaintained.3.0Establishaconstantpressurizerlevelandpressurecondition.3.1IsolateallRCSsamplepointstominimizemassinventoryloss.3.2CoordinatewiththeTechnicalSupportCenter(ifappropriate)toinsurethatoperationsthatcouldaffectthetestwillnotbeperformeduntiltheconclusionofthistest.4.0Recordthefollowingparameters:4.1RCSPressureRS4.2.PressurimrLevel4.3ChargingRatepsia0/GPM4.4RCPSealLeakoffFlowGPM4.5Time5.0IsolatetheCVCSletdownsystembyclosingtheletdownisolationvalvesAOV-2515andAOV-2516.6.0Turnoffallpressurizerheaters,andterminateanypressurizerspray.6.1WithRCPson,placepressurizerpressurecontrollerHIC-1100inmanualandzerothesignal.'.2WithRCPsoff,secureauxiliarysprayifbeingused.i7.0ContinuechargingtotheRCSuntileither:7.1PRESSURIZERPRESSUREINCREASES100PSIOR7'PRESSURIZERLEVELINCREASES5X rN PageoOFF-NORMALOPERNGPROCEDURENO.0120037EVISION0REACTORCOOLANTGASVENTSYSTEMOFF-NORMAWOPERATIONAPPENDIXB8.0Page2'f3Recordthefollowingparameters:8.1RCSpressurepsia8.2Pressurizerlevel=8.3Time90ReinitiateCVCSletdownflowandrestorenormalperssurizerpressureandlevelcontrol.10.0Calculatetheinitialandfinalpressurizervaporspacevolumes.(expressXlevelindecimalform)10.1Initialvaporvolume=(1-PZRlevel%)X1252ft3+134ft3-ft3ft3.10.2pinalvaporvolume(initialvol.)-(DltapZRlevel/X1252ft3)11.0CalculatethetotalchargedvolumeintotheRCS.11.1Chargedvolume,ft3=(chargingflowrateGPM-sealleakoffflowrate'GPH)XElapsedTime(min)7.45Calft12.0Determminetheexpectedpressurizerlevelchange12.1ExpectedDeltalevel=(chargedvolumeft3)X.0667=X13.0Determinetheactualpressurizerlevel'change.13.1ActualDeltalevel-Step8.2-Step4.2714.0Iftheactualpressurizerlevelchangeislessthantheexpectedlevelchangethenagaseousvoidexistsinthereactorcoolantsystem.15.0PerformthefollowingstepstodeterminethevolumeoftheRCSvoid:15.1Initial.RCSVoidft3(Init.VaporVol.,Step10.1)-(FinalVaporVol.,Ste10.2)-(CharpedVol.,Step11.1)1-'nitialPressurednaressure15.2FinalRCSVoidft3(InitialRCSVoid,Step15.1)X(InitialPressure)(FinalPressure)

Page9of20OFF-NORMALOPER<TINGPROCEDURENO.'012003j,REVISION0.-REACTORCOOLANTGASVENTSYSTEMOFF-NORMALOPERATION16.0SummaryAPPENDIXBPage3of3<RAFT16.1InitialPZRvaporvolume=16.2FinalPZRvaporvolume16.3Chargedvolume16.4ExpectedDeltalevel16.5ActualDeltalevel16.6InitialRCSvoid16.7FinalRCSvoidft3ft3ft3ft3ft3Difference=Difference=

tPage10of20f,OFF-NORMALOPERATINGPROCEDURENO.0120037,REVISION0REACTORCOOLANTGASVENTSXSTEMOFF-NORMALOPERATIONgpss,FTAPPENDIXCVENTINGTIMEPERIODPage1of31.0Duringacoreuncoveryevent,thereexiststhepotentialforasignificantamountofhydrogengeneratedinthecorewhichcouldbetrappedinthereactorvesselandreleasedtothecontainmentatmosphereduringtheventingoperation.Thecontainmenthydrogenconcentrationislimi'tedtolessthan4volumepercenttopreventapotentialexplosivemixturewithoxygen,therefore,theamountofhydrogenthatcanbeventedtothecontainmentisrestricted.Amaximumallowabletimeperiodforventingisdeterminedtolimitthecontainmenthydrogenconcentration.2.0Thisguideassumesthatthecontainmentconditionsarenearnormal.3.0Convertthecontainmentfree-volumetocontainmentvolumeatstandardtemperatureandpressure.conditions.3.1Note1Note2Cont.Press.492oR(Note1:Deletetermunlesscontainmentpressureisgreaterthan2PSIG.Note2:TemperatureindegreesRankine(oF+460)4.0Determinecontainmenthydrogenconcentrationinvolumepercentunits.4.1ObtainvaluefromChemistryDepartment.4.2IftherehasbeennoleakagefromtheRCStothecontainment,assumeavalueofzero.4.3ContainmentH2Concentration5.0Calculatethemaximumhydrogenvolumethatcanbeventedtothecontainmentwhichwillresultinacontainmenthydrogenconcentrationoflessthanorequalto3volumepercent.5.1Max.H2Vol,ft(3.0%-Cont.HConc.,Step4.3,%)X(Cont.Vol.[STP]Step3.1)100%tl6.0ObtainfromCurve81thehydogenflowratewhichwillresultatthepredictedRCSpressureattimeofventing.6.1PredictedRCSpressure~6.2HydrogenflowratepsiaSCFM Page.11of20.OFF-NORMA1,OP.INGPROCEDURENO.012003,REVISION0REACTORCOOLANTGASVENTSYSTEMOFF"NORMALOPERATIONAPPENDIXCPage2'f3DRAFT7.0Themaximumallowableventingtimeperiodwhichwilllimitthecontainmenthydrogenconcentrationto(3volumepercentisdeterminedby:7.1Volume,Step5.1Ventingperiod,mins.=H2<<<<te,tep 7OIOXIxh5AO25002000~1500~~10000.500~ee~~~41000T~700F~~2000FLOWRATE,SCFM3000T550FZ50~F4000~CgC)5VcVlC3-rlOIOF5xOOOOaCOMCOMO0CO0 page13of20OFF-NORMALOPETINGPROCEDURENO.012003,REVISION0REACTORCOOLANTGASVENTSYSTEMOFF-NORMALOPERATIONFIGURE1PRESSURIZERVENT-HYDROGENPLOWRATEvs.PRESSURECDCDCDCdCDCDCDCDCD~OVCDCDCDCDOO,r'CDCDCDoCDCDOOvrss'~unsssua Page14.of20OFF-NORMALOPTINGPROCEDURENO.01200.,REVISION0REACTOR.COOLANTGASVENTSYSTEMOFF-NORMALOPERATIONFIGURE2REACTORVENTSTEAMFLONRATEvs.PRESSUREt'CDCD0CDICDgR~C)CDCDCD'~~~~'~~CDCDCD~8vrsd'3unsssev Page15af20OFF-NORMALOPERATINGPROCEDURENO.0120037,REVISION0REACTORCOOLANTGASVENTSYSTEMOFFNORMAL.OPERATIONFIGURE3.PRESSURIZERVENT'TEAMFLOWRATEvs.PRESSURE~ICDCDCD~ECDECD~~E~CDCDCCr'DCDCVp)cmCC)CDACDL~~CDCDCDCDCxDCDCD~~CDCDCDCDCDCDvrss'sdnsssaa Page16of20OFF-NORMALOPEkINGPROCEDURENO.0120037,REVISION0REACTORCOOLANTGASVENTSYSTEMOFF-NORMALOPERATIONFACTSHEETSOURCESOFNON-CONDENSIBLESSource1.Completeoxidationofclad(hydrogen)2.Fuelrodfillgas(helium)3.Fissiongases(Xe,Kr,I2)4.Safetyinjectiontanks(nitrogen)a.Covergasb.Dissolvedgas5~Dissolvedinrefuelingwatertank(air)6.Dissolvedinprimarycoolant(hydrogen)7.Pressurizervaporspace(hydrogen)Volume<nv>,448000f't31140ft326ft351820ft3690ft31360ft3384ft793ft3Mass2514.8lbsa12.7.lbs9.0lbsa4042.2lbsb53.8lbs109.7lbsc2.2lbs4.6lbsNOTES'.Forbreaksrequiringthereturntonaturalcirculationnofuelrodruptureoroxidationispredicted.Numbersarebasedon36924fuelrods.b.ForbreaksrequiringthereturntonaturalcirculationtheSIT'sdonotinjectwater.c.Thelargestamountofliquidinjectedfromtherefuelingwatertank(RNT)duringtheboilingphaseforbreaksthatreturntonaturalcirculationisapproximately40%oftheRWTvolume.PressurizerVolumeofTopSphericalHeadVolumeofBottomSphericalHeadVolumeofCylinderSectionLevelSpanVolumevs.%SpanInchesvs.%VolumeRequiredtoCover'HeatersPressurizerO.D.PressurizerI.D.PressurizerCrossSectionalArea~134ft3114ft3~1252ft3~350inches~15ft3per%~3.6"per%-266ft3~106.5inches96inches~50.27ftSteamGeneratorsTotalVolumeofU-TubesVolumeofS/GColdPlenumVolumeofS/GHotplenum~1147ft3~250ft3~258ft3 APage17of20OFF-NORMALOPERATINGPROCEDURENO.0120037,REVISION0REACTORCOOLANTGASVENTSYSTEMOFF-NORMAL'OPERATIONPRESSURIZERLEVEL(%)VS.VOLUME(CuFt).PRESSURIZERat2250psia/653oF.DRIFTII~~~~0qf~~III)I~I~'iI,~I~~+O.-c,,Q.Q~'o

page18of20OFF-NORMALOPERATINGPROCEDURENO.0120037,REVISION0REACTORCOOLANTGASVENTSYSTEMOFF-NORMALOPERATIONREACTORARRANGEMENT-VERITCALSECTION-3:li~-CORE'NSTRUfv>EfsTM'IONASSEMBLY~~~~~Vo'lumeofN~X<Xregion-691ft3(VolumeofP~y/eregion-662ft3Note:Assumingactualvolumeasfreevolume(nothinginside)(I:-'.CONTROL!"ELE/itiENTi<SSEViBLYFULLY8ITHDRANNi1t'it/~~~~I~lhei-COREINSTRUiViENT.GUIDETUBEII~Iipi~'trI>II~iCEDING'(H077LE-INSTIIVViENTAT!0HN07ZLEIjAi.'IGMIViLhf(/)PlN"UPPERGv)DESTRUCTUREt~ii~:';:.iij(30"fD.~INlXTNOZ711'.~~l(2"lDOUTI.ETNOZZLESURVEILLANCEhoioip~~I,.II.;i".,!ii.II(~1ItClliC~Ii",I'I.D6.V..!..";ACTIVE,.tCORELENGTHt.:TI'.L'R!.IiL'!IIELI)-gSliijBBERII,"(i-.-::jjj++~1%IIi,IT<'Iii!l<V~P'i5I,',".~Nl'rI.:fi'!l~~~~~~~~4~~~~~~~~~~~~~~~~~~~~4~~~~LT'rcoRESTo..~~CORI.SUPPn'><o(t'tnttDill'tlifLCORE.SHROUDFUEL/',SSE<V(BLYl!IIii(IIICORESVPPG;TASSEMBLY3:~I'LO~V'SkII<TItt(~~~~t~t~~~~

~t,~Page19.of20OFF-NORMALOPER~TINGPROCES)URENO.012003/,REVISION0REACTORCOOLANTGASVENTSYSTEMOFF-NORMALOPERATIONPRESSURIZERARRANGEMENTI~'In"I~'I>>~4~P.arrrrrrararraarrrl~II~rr~~r<<lrJrrrarIrrracIrcrrrrrR~.qro.atOsoW>>9'tra~r/u;r~IE~IaaD\0rrrcCrrCrrCP~)>>W~\~C~,>>~ID~ICJBkit"~zPt>>I"~'9taa>>JvJaraavIaIlaIIr~Ia~ID'Pa.Cv'k.ar.~~~~~~~J~~~~~~~~~~~~~~~~~~~~~~~~/I~~~~~~JC~~~~~~~~~~~~~lp""4"J'rO/~~~~~t~~t~r~~~~J~r~~~~~Dc~~~~~~~~4~94I0/rrarl:rrrrrraarVr>>9~>>bDD~>>Caa>>~~>>'\$>>r~)~~yJll~rgg+gIa~IjI!<'i.vi Page20of20OFF-NORMALOPERATINGPROCEDURENO.0120037)REVESEON0REACTORCOOLANTGASVENTSYSTEMOFF-NORMALOPERATlONSYSTEMFLOPDIAGRAM~j).~Qy~goJp<<'SI'oocr.go4:,4),I:jt'loItIIJJSJ~J))44V~4rIUK~caJinK~<<~VISVEP-nf!nV~SSo~oo~\as4SO5r~SVH5s'OSI)ik)o+Xr~4SrlIJ~4O)E~Joo)osV~\J<<444wSC4o~SVV~4~SIJK~4oo~4Vr2'0ClI)x3cS~(JI~ooVaS~4()4~SrV4~oSS~4'El<<<<SS~4~4VKn4o~'IJ~In44JV44~4i'QIJ~o~4VKtoV~InntOS~S4~alVooKV(.,i~4~4n~~VoaK0~~S4)~ntto~S~~VVKKta~~~444~4V~4~ttoVIhoo'oO.~4.-o