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)

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Page1of20FLORIDAPOWER&LIGHTCOMPANYSTeLUCXEPLANTUNITNO.1OFF-NORMAL OPERATING PROCEDURE NO.0120037REVISION01.0Title:ReactorCoolantGasVentSystemOff-Normal Operation

2.0 ReviewandApproval

ReviewedbyFacilityReviewGroupApprovedbyPlantManager1919RevisionReviewedbyFRGApprovedbyPlantManager19193.0PurposeandDiscussion:

3.1Thepurposeofthisprocedure istoprovideamethodofventingnon-condensible gasesfromtheReactorCoolantSystem(RCS)whichmayinhibitcorecoolingduringnaturalcirculation.

3.2Guidanceandprecautions arealsoprovidedforuseindetermining thesizeofthenon-condensible voidformation, whentoinitiateventing,andtermination ofventingoperations.

4.0 Symptoms

4.1AbnormalRCSconditions suchaslargevariations inpressurizer levelduringnormalchargingandsprayingoperations haveoccurred.

4.2Ifavailable, reactorvesselheadtemperatures equaltoorgreaterthansaturation temperature.

4.3Planteventshaveoccurred(suchassafetyinjection tankfSIT}discharge, rapidRCScooldown, orcoreuncoveryevents)thatmayresultinthepresenceofagaseousvoidinthevesselhead.4.4Lossofpressurizer pressurecontrolduringnormalpressurizer conditio~s (i.e.,bubbleestablished, normalheaters/spray capabilities).

4.5Pressurizer indicates departure fromsaturated conditions i.e.,foragiventemperature, pressureishigherthansaturation pressure.

8203050249 820302PDRADQCK05000335PPDR

',~~1Y~j+hij Page2of20(OFF-NORMAL OPERATING PROCEDURE NO.0120037,REVISION0REACTORCOOLANTGASVENTSYSTEMOFF-NORMAL.

OPERATION 5.0Instruetions:5.1.Immediate Automatic Actions:DRAFTNone5.2Immediate OperatorActions:5.2.1Ifanyoftheabovelistedsymptomshaveoccurredoritissuspected thatthereisanon-condensible voidformation presentintheRCSbyotherdetection means,thenanychangesbeingmadetotheprimarysystemshouldbeterminated andasteadystatecondition shouldbeestablished.

5.3Subsequent OperatorActions:Note:Asterisked stepsarenotapplicable ifsafetyinfection hasbeeninitiated.

5.3.1Attempttorecombine anycondensible gasesbyincreasing RCSpressurethroughtheuseofpressurizer back-upheaters.Ifthisstepissuccessful incondensing thegasvolumeinthevesselhead(asindicated byareturntonormalreadingsinthoseparameters usedtodetermin'e thepresenceofthegases)thenreturntotheappropriate operating procedures.

5.3.2Coordinate withappropriate on-sitetechnical resources.

(Technical SupportCenter[TSClSupervisor ifmanned;Chemistry Department representative ifTSCisnotmanned).5.3.3Determine themagnitude/size ofthevoidformation perAppendix.B,ifpossible.

5.3.4Determine therecommended ventingtimerequiredperAppendixC,ifpossible.

5.3.5IncreasetheRCSsub-cooling to50oF+inaccuracies byeitherpressurizing viapressu'rizer backupheatersordecreasing RCStemperature viadumpingsteam.5'3.6Terminate containment purge,ifinprogress.

Startallavailable containment coolers.5.3.7Ensurethat.allavailable hydrogenrecombiners areinservice.5.3.8VerifythatChemistry Department ispreparedformonitoring thecontainment atmosphere forhydrogenviathehydrogenanalyzerand/orgrabsample.5.3.9Increasepressurizer levelto80-85%inpreparation forventing.Thisshouldprovideinventory todisplaceapproximately 900ft3beforereachingheaterlevel.

IPage3of20OFF-NORMAL OPERATING PROCEDURE NO.0120037,REVISION0REACTORCOOLANTGASVENTSYSTEMOFF-NORMAL OPERATION

5.0 Instructions

(continued)

'~5.3(continued)

DRAFT5.3.10Ifnotalreadyperformed, manuallyblockSIASifthepermissive isenergized duringtheventingprocess.'.3.11 RestorepowertotheRCGVSsolenoidoperatedValvesbyinserting fuses26F2&4and11F2&4.C.R.A.C.PANEL1llF2&4C.R.A.CoPANEL226F2&4V-1442V-1444V-1445V-1449V-1441V-1443V-14465.3.12Monitorpressurizer pressureandlevelduringtheventingperiodandminimizethepressureandleveldecreasebyselective useofchargingpumpcombinations andletdownflow.5.3.13Observethepressurizer leveltrendduringthereactorvesselventingand,fromthefollowing conditions, determine theprobablestatusofthereactorcoolantsystem:a.Controllable pressurizer level-gaseousvoidsexistintheRCSotherthanthereactorvesselheadorpressurizer.

Theorificeintheheadventissizedtolimitwaterrelieftowithinthemake-upcapability ofonechargingpump(44GPM82250psia).Therefore, ifnogasesarepresentinthevesselhead,thenthepressurizer levelshouldremaincontrolable.

b.Decreasing pressurizer level.-gaseousvoidsexistinthereactorvesselhead.Theventingofgaseswillresultinarapiddecreaseinpressurizer levelduetothemassflowrateofthegasesbeinggreaterthanthemassinputbeingprovidedbythechargingsystem.rCAUTION:Ifpressurizer leveldecreases tolessthan20%,thenattempttorestorelevelbytheCVCSSystem(isolateletdown,max.charging).

Iflevelcannotberestored, thenmanuallyinitiatesafetyin)ection.

Page4of20OFF-NORMAL OPERATING PROCEDURE NO.0120037,REVISION0REACTORCOOLANTGASVENTSYSTEMOFF-NORMAL OPERATION

/5.0,Instructions:

(continued)

'<.5.3'(continued) jRAB5.3.14Commenceventingthereactorvesselhead.Theflowpathusedisoptional, andthedecisionastowhichisusedshouldbebasedonquantityofgastobereleased.

Ifrecoveryandprocessing inthewastegassystemisdesired,thenventtothequenchtank.Ifquantityislarge,thenventtocontainment atmosphere.

5.3.15Terminate ventingwhen:a.TIMEPERIODDETERM1NED INSTEP5.3.4ISMET,ORboPRESSURIZER PRESSUREDECREASES BY200PSIyORc.PRESSURIZER LEVELDECREASES BELOW25XLEVEL,ORd.REACTORCOOLANTSUBCOOLINGLESSTHAN20oF+INACCURACIES, ORe.THEREACTORVESSELHEADISREFILLEDASINDICATED BYADECREASEINTHERATEOFCHANGEOFPRESSUREANDPRESSURIZER LEVELS5.3.16Re-establish pressurizer levelandevaluatetheresponseofthepressurizer leveltrendtodetermine ifagasbubbleexistedinthehead.Ifagasbubbleexistedandtheventingwasterminated priortothevesselbeingcompletely

refilled, thenreturntoStep5.3.14.Note:Ifmultipleventingoperations arerequiredandthecontainment hydrogenconcentration isequaltoorgreaterthan3volumepercent,thenprovisions mustbemadetoremoveorreducethevolumeofhydrogenfromthecontainment priortore-opening thereactorvesselheadvent.5.3.17Returntotheappropriate operating procedures following successful completion oftheventingofthereactorvesselhead.

Page5of20OFF-NORMAL OPETINGPROCEDURE NO.012003,REVISION0REACTORCOOLANTGASVENTSYSTEMOFF-NORMAL OPERATION 6.0

References:

6.1C-E"FinalReportontheReactorCoolantGasVentSystem"..

7.0Records:7.1Completed Appendix BandCworksheetsshallberetainedintheplantfileinaccordance withQI-17/PSL-1.

Page6of20OFF-NORMAL OPERATING PROCEDURE NO.0120037,REVISION0REACTORCOOLANTGASVENTSYSTEMOFF-NORMAL OPERATION APPENDIXAPRECAUTIONS 1.Thisventingprocedure shouldnotbeusedas'theprimarymeanstomitigateaninadequate corecoolingevent.2.Ventingoperations shouldbeperformed priortotheinitiation ofsafetyinjection flowthrottling duringaPost-Loca cooldownanddepressurization.

Duringventing"fullflow"SIcapabilities mustbe.maintained ifneeded.3.Donottripanyrunningorstartanynon-operating reactorcoolantpumpsduringventingoperations.

4.Containment purgeshouldbeisolatedtopreventthereleaseofanyradioactive gasestotheenvironment.

5.Allavailable containment aircirculation equipment shouldbestartedtopreventanyhydrogenfromformingagaspocketandtoensurearepresentative hydrogenconcentration isobtainedduringsampling.

6.AppendixC"VentingTimePeriod"determines themaximumallowable timeperiodforventingwhichwilllimitthecontainment hydrogenconcentration tolessthan3volumepercent.

Page7o20OFF-NORMAL OPER.NGPROCEDURE NO.'0120037~EVISION 0.REACTORCOOLANTGASVENTSYSTEMOFF-NORMA&OPERATION APPENDIXBNON-CONDENSIBLE VOIDFOE'LATION SIZINGPage1of3DRAFT1.0Theobjective ofthistestistoinjectaknownvolumeofboratedwaterintotheRCSandthencomparetheexpectedresultswiththeactualresults.E20Ifthesafetyinjection systemisinservice,thenthefollowing stepsarenotapplicable sincenormalpressurizer controlwillnotbemaintained.

3.0 Establish

aconstantpressurizer levelandpressurecondition.

3.1IsolateallRCSsamplepointstominimizemassinventory loss.3.2Coordinate withtheTechnical SupportCenter(ifappropriate) toinsurethatoperations thatcouldaffectthetestwillnotbeperformed untiltheconclusion ofthistest.4.0Recordthefollowing parameters:

4.1RCSPressureRS4.2.Pressurimr Level4.3ChargingRatepsia0/GPM4.4RCPSealLeakoffFlowGPM4.5Time5.0IsolatetheCVCSletdownsystembyclosingtheletdownisolation valvesAOV-2515andAOV-2516.

6.0 Turnoffallpressurizer

heaters,andterminate anypressurizer spray.6.1WithRCPson,placepressurizer pressurecontroller HIC-1100inmanualandzerothesignal.'.2 WithRCPsoff,secureauxiliary sprayifbeingused.i7.0ContinuechargingtotheRCSuntileither:7.1PRESSURIZER PRESSUREINCREASES 100PSIOR7'PRESSURIZER LEVELINCREASES 5X rN PageoOFF-NORMAL OPERNGPROCEDURE NO.0120037EVISION0REACTORCOOLANTGASVENTSYSTEMOFF-NORMAWOPERATION APPENDIXB8.0Page2'f3Recordthefollowing parameters:

8.1RCSpressurepsia8.2Pressurizer level=8.3Time90Reinitiate CVCSletdownflowandrestorenormalperssurizer pressureandlevelcontrol.10.0Calculate theinitialandfinalpressurizer vaporspacevolumes.(expressXlevelindecimalform)10.1Initialvaporvolume=(1-PZR level%)X1252ft3+134ft3-ft3ft3.10.2pinalvaporvolume(initialvol.)-(DltapZRlevel/X1252ft3)11.0Calculate thetotalchargedvolumeintotheRCS.11.1Chargedvolume,ft3=(charging flowrateGPM-sealleakoffflowrate'GPH)XElapsedTime(min)7.45Calft12.0Determmine theexpectedpressurizer levelchange12.1ExpectedDeltalevel=(chargedvolumeft3)X.0667=X13.0Determine theactualpressurizer level'change.

13.1ActualDeltalevel-Step8.2-Step4.2714.0Iftheactualpressurizer levelchangeislessthantheexpectedlevelchangethenagaseousvoidexistsinthereactorcoolantsystem.15.0Performthefollowing stepstodetermine thevolumeoftheRCSvoid:15.1Initial.RCSVoidft3(Init.VaporVol.,Step 10.1)-(Final VaporVol.,Ste10.2)-(Charped Vol.,Step 11.1)1-'nitial Pressurednaressure15.2FinalRCSVoidft3(InitialRCSVoid,Step15.1)X(InitialPressure)

(FinalPressure)

Page9of20OFF-NORMAL OPER<TINGPROCEDURE NO.'012003j, REVISION0.-REACTORCOOLANTGASVENTSYSTEMOFF-NORMAL OPERATION 16.0SummaryAPPENDIXBPage3of3<RAFT16.1InitialPZRvaporvolume=16.2FinalPZRvaporvolume16.3Chargedvolume16.4ExpectedDeltalevel16.5ActualDeltalevel16.6InitialRCSvoid16.7FinalRCSvoidft3ft3ft3ft3ft3Difference=

Difference=

tPage10of20f,OFF-NORMAL OPERATING PROCEDURE NO.0120037,REVISION0REACTORCOOLANTGASVENTSXSTEMOFF-NORMAL OPERATION gpss,FTAPPENDIXCVENTINGTIMEPERIODPage1of31.0Duringacoreuncoveryevent,thereexiststhepotential forasignificant amountofhydrogengenerated inthecorewhichcouldbetrappedinthereactorvesselandreleasedtothecontainment atmosphere duringtheventingoperation.

Thecontainment hydrogenconcentration islimi'tedtolessthan4volumepercenttopreventapotential explosive mixturewithoxygen,therefore, theamountofhydrogenthatcanbeventedtothecontainment isrestricted.

Amaximumallowable timeperiodforventingisdetermined tolimitthecontainment hydrogenconcentration.

2.0 Thisguideassumesthatthecontainment

conditions arenearnormal.3.0Convertthecontainment free-volume tocontainment volumeatstandardtemperature andpressure.

conditions.

3.1Note1Note2Cont.Press.492oR(Note1:Deletetermunlesscontainment pressureisgreaterthan2PSIG.Note2:Temperature indegreesRankine(oF+460)4.0Determine containment hydrogenconcentration involumepercentunits.4.1ObtainvaluefromChemistry Department.

4.2IftherehasbeennoleakagefromtheRCStothecontainment, assumeavalueofzero.4.3Containment H2Concentration

5.0 Calculate

themaximumhydrogenvolumethatcanbeventedtothecontainment whichwillresultinacontainment hydrogenconcentration oflessthanorequalto3volumepercent.5.1Max.H2Vol,ft(3.0%-Cont.H Conc.,Step 4.3,%)X(Cont.Vol.[STP]

Step3.1)100%tl6.0ObtainfromCurve81thehydogenflowratewhichwillresultatthepredicted RCSpressureattimeofventing.6.1Predicted RCSpressure~6.2HydrogenflowratepsiaSCFM Page.11of20.OFF-NORMA1, OP.INGPROCEDURE NO.012003,REVISION0REACTORCOOLANTGASVENTSYSTEMOFF"NORMAL OPERATION APPENDIXCPage2'f3DRAFT7.0Themaximumallowable ventingtimeperiodwhichwilllimitthecontainment hydrogenconcentration to(3volumepercentisdetermined by:7.1Volume,Step5.1Ventingperiod,mins.=H2<<<<te,tep 7OIOXIxh5AO25002000~1500~~10000.500~ee~~~41000T~700F~~2000FLOWRATE, SCFM3000T550FZ50~F4000~CgC)5VcVlC3-rlOIOF5xOOOOaCOMCOMO0CO0 page13of20OFF-NORMAL OPETINGPROCEDURE NO.012003,REVISION0REACTORCOOLANTGASVENTSYSTEMOFF-NORMAL OPERATION FIGURE1PRESSURIZER VENT-HYDROGENPLOWRATEvs.PRESSURECDCDCDCdCDCDCDCDCD~OVCDCDCDCDOO,r'CDCDCDoCDCDOOvrss'~unsssua Page14.of20OFF-NORMAL OPTINGPROCEDURE NO.01200.,REVISION0REACTOR.COOLANTGASVENTSYSTEM OFF-NORMAL OPERATION FIGURE2REACTORVENTSTEAMFLONRATEvs.PRESSUREt'CDCD0CDICDgR~C)CDCDCD'~~~~'~~CDCDCD~8vrsd'3unsssev Page15af20OFF-NORMAL OPERATING PROCEDURE NO.0120037,REVISION0REACTORCOOLANTGASVENTSYSTEMOFFNORMAL.OPERATION FIGURE3.PRESSURIZER VENT'TEAMFLOWRATEvs.PRESSURE~ICDCDCD~ECDECD~~E~CDCDCCr'DCDCVp)cmCC)CDACDL~~CDCDCDCDCxDCDCD~~CDCDCDCDCDCDvrss'sdnsssaa Page16of20OFF-NORMAL OPEkINGPROCEDURE NO.0120037,REVISION0REACTORCOOLANTGASVENTSYSTEMOFF-NORMAL OPERATION FACTSHEETSOURCESOFNON-CONDENSIBLES Source1.Completeoxidation ofclad(hydrogen) 2.Fuelrodfillgas(helium)3.Fissiongases(Xe,Kr,I2)4.Safetyinjection tanks(nitrogen) a.Covergasb.Dissolved gas5~Dissolved inrefueling watertank(air)6.Dissolved inprimarycoolant(hydrogen) 7.Pressurizer vaporspace(hydrogen)

Volume<nv>,448000f't31140ft326ft351820ft3690ft31360ft3384ft793ft3Mass2514.8lbsa12.7.lbs9.0lbsa4042.2lbsb53.8lbs109.7lbsc2.2lbs4.6lbsNOTES'.Forbreaksrequiring thereturntonaturalcirculation nofuelrodruptureoroxidation ispredicted.

Numbersarebasedon36924fuelrods.b.Forbreaksrequiring thereturntonaturalcirculation theSIT'sdonotinjectwater.c.Thelargestamountofliquidinjectedfromtherefueling watertank(RNT)duringtheboilingphaseforbreaksthatreturntonaturalcirculation isapproximately 40%oftheRWTvolume.Pressurizer VolumeofTopSpherical HeadVolumeofBottomSpherical HeadVolumeofCylinderSectionLevelSpanVolumevs.%SpanInchesvs.%VolumeRequiredtoCover'Heaters Pressurizer O.D.Pressurizer I.D.Pressurizer CrossSectional Area~134ft3114ft3~1252ft3~350inches~15ft3per%~3.6"per%-266ft3~106.5inches96inches~50.27ftSteamGenerators TotalVolumeofU-TubesVolumeofS/GColdPlenumVolumeofS/GHotplenum~1147ft3~250ft3~258ft3 APage17of20OFF-NORMAL OPERATING PROCEDURE NO.0120037,REVISION0REACTORCOOLANTGASVENTSYSTEMOFF-NORMAL

'OPERATION PRESSURIZER LEVEL(%)VS.VOLUME(CuFt).PRESSURIZER at2250psia/653o F.DRIFTII~~~~0qf~~III)I~I~'iI,~I~~+O.-c,,Q.Q~'o

page18of20OFF-NORMAL OPERATING PROCEDURE NO.0120037,REVISION0REACTORCOOLANTGASVENTSYSTEMOFF-NORMAL OPERATION REACTORARRANGEMENT

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