ML17258A428

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Review of Design & Operation of Ventilation Sys for SEP Plants Rochester Gas & Electric Co,Re Ginna Nuclear Power Plant, Revised Draft Technical Evaluation Rept
ML17258A428
Person / Time
Site: Ginna Constellation icon.png
Issue date: 11/30/1981
From: HERRICK R C
FRANKLIN INSTITUTE
To: BROWN S
NRC
Shared Package
ML17258A427 List:
References
TASK-09-05, TASK-3.D.3.4, TASK-9-5, TASK-RR, TASK-TM TER-C5257-409, TER-C5257-409-DFT-R1, NUDOCS 8201110469
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~*~~Ml(DRAFT)TECHNICALEVALUATIONREPORTREVIEWOFTHEDESIGNANDOPERATIONOFVENTILATIONSYSTEMSFORSEPPLANTS.ROCHESTERGASANDELECTRICCONPANY.R.E.GINNANUCLEARPOWERPLANTNRCOOCKETNO.50-244NRCTACNO.47068NRCCONTRACTNO.NRC43-78-118FRCPROJECTC5257.FRCASSIGreearrMFRcTASH409PreparedbyFranklinResearchCenterTheParkwayatTwentiethStreetPhiladelphia,PA19103Author.RC.HarrLckFRCGroupLeader:R.C.HerrickPreparedforNuclearRegulatoryCommissionWashington,D.C.20565LeadNRCEngineer:S.BrownRevised,November30,1981IThisreportwaspreparedasanaccountafworksponsoredbyanagencyoftheUnitedStatesGovernment.NeithertheUnitedStatesGovernmentnoranyagencythereof,oranyoftheiremployees,makesanywananty,ex-pressedorimplied,arassumesanylegalliabilityorresponsilityforanythirdparty'suse,ortheresultsofsuchuse,afanyInformation,apparatus,productorprocessdisclosedinthisreport,arrepn1sentsthatitsusebysuchthirdpartywouldnotInfringeprivatelyownedrights.820i1.<04b050002cy81l231iPORADOC"PDRP0llFranklin'ResearchCenterADivisionofTheFranklininstitttte1heBenjaminFmnkeaParkway.PAL,Pa:191031215)448-1000

~I~eTER&5257-409CONTENTSStationTitlePsc86INTRODUCTIONe~~e~~~~~~1REVIEWCRITERIA~~~~~~.~~~~~2RELATEDSAFETYTOPICS~~~~~~~TECHNICALEVALUATIONe~~~~~~~~'4~54.1ControlRoomAreaVentilation4.2SpentFuelPoolAreaVentilationSystem.4.3AuxiliaryBuildingandRadwasteArea.VentilationSystem.4.4TurbineBuildingVentilationSystem.'.5EngineeredSafetyFeaturesVentilationSystems~55~6994.5.1EngineeredSafeguardEquipmentVentilationandCooling4.5.2RelayRoom4-5.3BatteryRooms4.5.4AuxiliaryandEmergencySystems.4.5.$DieselGeneratorRoomsCONCLUSIONS~~~~~~~~~~5.1ControlRoomAreaVentilation5.2SpentFuelPoolAreaVentilation5.3,AuxiliaryBuildingandRadwasteAreaVentilationSystem.5.4TurbineBuilding.1'.5EngineeredSafetyPeatfiresVentilation.I,~5.6"Safety-GradeEquipment.REFERENCES~'e~~~'~~I~~~10ll121215161616~16~'7~17192000FranklinResearchCenterAOieitianotTlieFinnk5nIneeuta TER~5257-4091.INTRODUCTION.ThisreviewofthedesignandoperationofventilationsystemsattheR.E.GinnaNuclearPowerPlantisunderTopicIX-5oftheSystematicEvaluationProgram(SEP)andconsistsofthereviewandassessmentoXsafety'arginsinlightofchangesindesignconditionsandcriterSa.ThepurposeofthisreviewistoassurethatventilationsystemsattheQumaplanthavethecapabilitytoprovideasafeenvironmentforplantpersonnel.underal1modesofoperationandtodeterminewhetherallsafety-relatedequipmentcanfunctionproperlytoassuresafeshutdownofthereactoiundernorma1andemergencyconditions.'sbackgroundforthisreview<theSEPhasbeenestab1xshedtoevaluatethesafetyof11oftheoldernuclearplants.ComparisonafeachpXant,againstcurrentlicensingcriteriaisanimportantpartoftheSEP,with137selectedtopicsbeingstudied.Informationforthesestudiesisderivedfromawiderangeofsources,includingfinalsafetyanalysis.reports,morerecentdrawingsandsystemdescriptions,licenseesubmittals,andonsitereviewandinspection.Informationforthisreviewincludedtheabovesources+elementsofrelatedSEPtopicsalreadyreviewedfortheGinnaplant,anda'plantvisitthatwasheldonJuly21-22<1981.IIII)FranidlnResearchCenterADlvbiondThe.Frank5nhsdaxa TE~257W092.REVIEWCRITERIAIndeterminingtheventilationsystemstobeevaluated,.FranklinResearch\Center(FRC)wasguidedbythepurposesoftheSEPwithitsemphasisonthe.review,andassessmentofsafetymargins.~InaccordancewithAssigssment15,aventilationsystemorportionthereofisconsideredessentia1tosafetyifitservicessystems.orpartsofsystemsthatarenecessarytoensure:otheintegrityofthereactor.coolantpressureboundaryothecapabilitytoshutdownthereactorandmaintainitinasafecondition.othecapabilitytopreventormitigatetheconsequencesofaccidentsthatcouldresultinpotentialoffsiteexposurescomparab1etotheguidelinesof10CFR100,"ReactorSite'riteria."Thecriteriaand'guidelinesusedtodetermineifthe.ventilationsystemsmeetthetopicsafetyob)ectivesarethoseprovidedinthefollowingsectionsoftheStandardReviewPlanssectionP~Suboct9.4.1ControlRoomAreaVentilationSystem9.4.2SpentFuelPoolAreaVentilationSystem9.4'AuxiliaryandRadwasteAreaVentilationSystem'9.4494.5TurbineAreaVentilationSystemEngineeredSafetyFeatureVentilationSystemInadditiori,applicable'portionsofrelatedsafetytopicreviewswereusedwherepossible.InaccordancewithTask1,ParagraphE,ofAssignment15,thefollowingcriteriawillalsobeusedtoevaluatethoseheating,ventilation,andairconditioning(HVAC)systemsorportionsthereofthatarereliedupontoassureI~u.theoperationofsafety-relatedequipment:1.Whetherasingleactivefailurecannotresultinlossofthesystem'functional'performanc'ecapability.!illFrankGnResearchcenteIAIMsisnoIgbeI'tenkSnIneCuAt~~-

~~TER~257-4092.Whetherthefailureofanon-safety-relatedportionofasystemwillaffecttheperformanceoftheessentialportionofthesystemorwill.resultinanunacceptablerelease,aswasdefinedduringlicensingreview,ofradioactivecontaminants.3.Whetherthecapabilityexiststodetecttheneedforisolationandtaisolatesafety-relatedportionsofthesystemintbeevent,of~failuresormalfunctions,andthecapabilityoftbeisolatedsystemtofunctionundersuchconditions.4.Whethertheventilationsystems(exceptforthecontrolroom)havethecapabilitytodirectventilationairfromareasofLowradio-activitytoareasofprogressivelyhigherradioactivity.5.Whetherbothcontrolroomandengineeredsafetyfeatnreareaventilationsystemshavethecapabilitytomaintaintemperaturewithinthedesignparametersrangeforsafety-relatedequipment.6.Whethertheengineeredsafetyfeatureareaventilationsystem'hasthecapabilitytocirculateairtoprevent.accumulationofflammableorexplosivefuelvapormixturesfromstoredfuel.~~till'FranldinResearchCenterADlvbkedTheFrankSn~

TER~257-4093~RELATEDSAFETYTOPICSThescopeofreviewforthistopicwaslimitedtoavoMduplicationofeffort,sincesomeaspectsofthereviewarecoveredunderrelatedtopics.~Theserelatedtopicsareidentifiedbelow.Eachrelatedtalcreportcontainsacceptancecriteriaandreviewguidanceforitssubject'mar.~PTapicII-2AZZ-3'IZ-4IZZ-1IZZ-2ZIZ-3ZZZ-4III-5+A'II-5BZIZ-6IZZ-12VZ4VI-7.C.1VZ-8VZZ-3IX-3ZX-6XV-20TMIZZID3~4~SubeatSevereWeatherPhenomenaFloodingPotentialClassificationofStructures,ComponentsandSystems(SeismicandQuality)WindandTornadoLoadingsHydrodynamicLoadsMissileGenerationandPenetrationPipeBreaksInsideContainmentPipeBreaksOutsideContainmentSeismicDesignConsiderationsEnvironmentalQualificationofSafe~RelatedEquipmentContainmentIsolationSystemIndependenceofOnsitePowerControlRoomHabitabilitySystemsRequiredforSafeShutdownStationServiceandCoolingWaterFireProtectionRadiologicalConsequenceofFuelDamagingAccidents(InsideandOutsideContainment)ControlRoomHabitability'~~!IllFranMInResearchCenterADMskndTheFranl4nbasuco TERM5257-4094~TECHNICALEVALUATION41CONTROLROOMAREAVENTILATIONThefunctionofthecontrolroomareaventilationsystemistoprovideacontrolledenvironmentforthesafetyandcomfortofcontroIroompersonneland,toassuretheoperabilityofcontrolroomcomponentsduringnoanaloperating>anticipatedoperationaltransient,and'designbasisaccidentconditions.However,thecontrolroomsystemisbeingreviewed,generica11yunder9RIItemIII.D.3.4,"ControlRoomHabitability,"toassurecomp1iancewith,10CFR50<AppendixA,"GeneralDesignCriteriaforNuclearPowerPlantsg"Criterion19,"ControlRoom."Forthisreason,thecontro1rocetareaventilationsystemwasnotevaluatedasapartofthisreview.4~2SPENTFUELPOOLAREAVENTILATIONSYSTEMAsapartoftheauxiliarybuildingventilationsystem,,thespentfuelpoolareaventilationsystemservestocontrolairborneradioactivityin,thespentfuelpoolareaduringnormaloperating,anticipatedoperationaltran-sient,anddesignbasisaccidentconditions.Thisisaccomplishedbyductinga'ort:ionoftheairfromt5eauxiliarybuilding'soutsideairsupplyandconditioningsystemtothespentfuelpoolareawhereitisdirectedacrossboththespentfuelpoolandthedecontaminationpittoseparateexhaustaircollectors.AircollectedfromboththedecontaminationpitandspentfuelpoolcollectorsisdrawnbyandductedtoauxiliarybuildingexhaustfanNoC.Whiletheexhaustairfromthedecontami'nationpitisducteddirectlytofanNo.C;.exhaustairfromthespentfuelpoolwatersurfaceisdrawnthroughafilterassemblyconstructedtoprovideachoiceofcharcoaland/orroughingfilters.ThiscombinationfilterassemblyisarecentadditiontotheGinnaplant.AreviewofGinna'sfuelhandlingaccidentanalysisinSection14.2.1oftheFSAR.indicatesthattheventilation.systemisnotessentialforpreventingrormitigatingtheconsequences.,ofaccidentsthagcouldresultinpotentialexposurescomparabletotheexposureguidelinesof10CFR100,ReactorSite.Criteria."Nofurtherrevieworassessmentisincluded..00FranklinResearchCenterADlvhlonetTheFrsnldnhsdustcI TERM5257-4094'AUXILIARYBUILDINGANDRADWASTE,AREAVENTILATIONSYSTEMlThissystemprovidesclean,filtered,temperedairtoal1regionsoftheoperatingflooroftheauxiliarybuilding,includingthespentfue1poolanddecontaminationpitareas.Thesystemexhaustsairfroma11regionsoftheauxiliarybuildinganditsspecificequipmentroomsandworkareasbymeansoKfourseparateexhaustsubsystems,inadditiontoprovidingexhaustforthe-servicebuildingandintermediatebuildingOtherthanthespent.fue1poolanddecontaminationpitarea,whichhasadedicatedairsupplyandexhaustpathwithinthissystem,theauxiliarybuildingsupplyairiadirectedtotheopenworkareasofthemainoperatingfloorfromwhichamajorportionoftheventilatingairmakesitsway.downtothe.intermediateand'basementlevelsofthepuxiliazybuildingbymeansofstairwellsandotherflooropeningsSeparateexhaustductscollecttheairinspecificregionsofallfloors.Inthismanner,theairisdirectedfromregionsoflowradioactivitypotentialonthegeneraloperatingfloortoareasofprogressivelygreaterradioactivitypotentialon'theintermediateandbasementlevelsinsatisfactionofoneacceptancecriterionofSection2Duringnormalplantoperation,outsideairisintzoducedandtemperedbyoneairhandlingunit,thencollectedfromallregionsoftheauxiliarybuild-ingaswellasfromtheservicebuildingandtheintermediatebuildingbyaclosedductingsystem,andthenfilteredthroughalargeHEPAfilterandexhaustedthroughtheplantventstack.Thelarge<redundantexhaustfansassureanadequateflowofexhaustairtocreatesufficientlylowpressuretopromoteairleakageinto<ratherthanoutof,theauxiliarybuildingAir-actuateddampersonallsystembranches,aswellasontheoutsideairinletandexhaust,piovideforisolationofaregionwhennecessary.A1thoughtheenvironmentalqualificationoftheisolationdampersisnotdocumented,conditionswithintheauxiliarybuildingduringnormaloperationorfollowingadesignbasisaccidentareexpectedtoremainatatmosphericpressurewithtemperaturesrangingbetween50and104P(see'AppendixA,Reference19)..1.CrDuringshutdo~withalossof..offsitepower,theairhandlingunitsupplyingoutsideairshutsdownandisisolatedbyitsdampers<andthelargemainexhaustfansshutdownwithclosedredundantdampers;however,areducedllllFranklinResearchCenterADMshndlheFranklinlectue TERM5257-409quantityofairiscirculatedandexhaustedbyredundantfansineachoftheseparateexhaustcollectorsubsystems.Thesefansareautotsaticallyconnectedtotheemergencydiesel<<poweredbuses.AmoredetailedreviewofeachexhaustcollectorsubsystemfoUows.Notethatthesediscussionsconsidermainlythesupplyandexhaustofventilationair..Specificcoolingofsafety-relatedequipmentisreviewedlaterinthisreport.Thefirstofthefouisubsystems,theventilatihnsysteaforthespentIfuelpoolanddecontaminationpitareas,althoughasubsystemoftheauxiliarybuildingventilationsystem,isdiscussedinSection4.2ofthisreport.TwoexhaustsubsystemsdeliverairtoacombinedHEPAandcharcoalfilter<installedinrecentyearsontheintermediatelevelOneoftheselinescollectsexhaustairfromthegeneraloperatingfloorarea,theboricacidtankar'ea,andthedrummingstation,whiletheotherco11ectsexhaustairfromselectedareasoftheintermediateamdbasementfloors-Bothexhaustlinesareequippedwithair-actuatedisolationdampersmountedineachlinejustbeforethe.filter.BothisolationdampersareactuatedfromthemotorcontrollerofauxiliarybuildingexhaustfanNo.1G.With.alossoftheisolationsignal,eachdamperfailstotheopenpositiontoallowcontinuedventilation.Theremainingexhaustsubsystemalsocollectsairfromthebasementandintermediatelevels,includingthewasteevaporatorarea,thewasteholduptankarea,theconcentrateholduptank<andthegasdecaytankareas.Withinthissubsystem,thevolumecontroltankandreactorcoolantfilterareasareservedwithanadditionalboosterexhaustfan,No.1P.Thisexhaustairsub-systemservicingradwasteareasemploysacharcoalfilter,reduxBantfans,andair-actuatedisolatorsatitsdischarge.ThelineintowhichitdischargesisservicedbyexhaustfanNo.1GbeforereachingthemainHEPTfiltersandthemainexhaustfansthatdelivertheexhausttotheplantventingstack.Themorecomplexventilatingsystem"shownonGinnaDrawingNo.33013-533'(datedSept.'30>1975)isare'visionoftheoriginalventilatingsystem.Themajorchangesincludetheadditionoftheint:ermediate:levelcharcoalandHEPA000FranklinResearchcenterADhbbnor~Frsnklnhavoc TER~257-409filtersandexhaustfanNo.16.Aspreviouslymentioned,dischar'geductsfromtwoseparateareasdischargetotheintermediateHEPAfilterandeachareamaybeisolatedbyair-actuateddampers.Theexhaustfromtheradwasteareacharcoalfilter,poweredbyredundantexhaustfans<dischargestothe'interme-.diateHEPAfilteroutputside.AuxiliarybuildingexhaustfanNo.1Gacts'saboosterfaninthisline.Thisreviewindicatesthat,dqringanemergency-shutdownwhentheplantis,operatingunderonsitedieselpower,thesefanloadaarearrangedonei'thertheAorBdiesel~weredbuses.Whileasinglefailure(onedieselfailure)willnotcausethesystemtofail(withbackflowinto:..areasoflesserradiation),itisnotedthat,withafailuretodieselunitA,exhaustfanNo.1Gwillshutdown,thusreducingtheexhaustremovalfranareaaoftheoperatingfloorandareasattheintermediateandbasementlevelsWhilethiswillnotpreventasafeshutdown,itcouldinhibitpersonnelaccess-totheseareas.FinalexhaustairhandlingfromtheauxiliarybuildingisprovidedbyalargeHEPAfilter,redundantfans'auxiliarybui3dingexhaustfansNos3AandlB);andassociatedisolationdampers.Itisnotedthatthesefinallargefansoperateon4160VpowerandarenotconnectedtotheemergencydieselbusesAlossofoffsitepowerwould.leavetheventilationexhaustfunctiontothesmallerfansineachsubsystem,augmentedonlybyanynaturaldraftgainedfromtheplantventstack.Anypositivepressuredevelopedinthefinalductinglocatedintheintermediatebuildingcouldcausecontaminatedexhaustairtoleakfromtheductingtotheintermediatebuildingcontrolledaccessarea.Thiswouldbeinviolationoftheacceptabi,litycriterion(Section2)forductingairfrom.regionsoflowradioactivitypotentialtoregionsofhigherradioactivitypotentialUnderthesesameemergencyshutdownconditionsusingonsitedieselpoweritisnotedthatanumberofexhaustsubsystemductsdischargeattheinlettothe'ainHEPAfilter<eachofwhichispoweredbyatleastoneexhaustfanoraredundantparallelseto'ftwoexhaustfans.Withoutdraftaugmentationfromtheplant'entstack,itispossible.-thatthepressure-flowcharacteristicsof,theseparallel.subsystems.arenot"matched.sufficientlyandthatthesubsystemprovidingthehighestpressurepotentialatthispointcouldcauseexhaustairtoflowbackwardthroughoneormoreexhaust.subsystems.Notethattheduct!illFranMinResearchCenterADMskectTheFanonInsdeae TER~257-409fromtheintermediatelevelHEPAfilterhasexhaust'anNo.1Ginserieawiththeotherparallelfansetinthissubsystem.AlthoughfanNo..1Ghasbeen'dentifiedasanaxialflowfan(withautomaticallycontrolledvariable-pitchblades)thatmaintainsonlyadifferentialpressureof4.5inchesof.water.acrossthefan;thepressure-flewcharacteristicsoftheotherfansarenotknown.WithanoutageondieselunitB,onefanon'eachredundantfansetwillshutdown,thuslesseningtheflowineachsubsystemandincreasingtheinfluenceofaddedseriesfanNo.1Gontheonelinefromtheradwastearea.Therefore,itis.recommendedthatthesituationbeinvestigatedtoassurethatexhaustairfromtheradwasteareacannotflowbackwardinto'theintermediatebuildingand/orintothecontrolledaccessareainterfacewiththeservicebuilding.Notethattheairhandlingunitssupplyingoutsideairtoeachoftheseareasarenotpoweredbytheprimaryemergencydieselgeneratorbat,onlybybusesconnectabletothedieselpowersource.44TURBINEBUILDINGVENTILATIONSYSTEMTheturbinebuilding,whilenotrequiringanHVACsystem,usesroof-mentfans,wallventfans,windows,andunitheatersforventilationandtemperaturecontrol.Thefansarenotsuppliedbyemergencydiesel-generatedpower,andlossofthesefanswouldnotbecriticaltoasafeshutdownTheturbinebuildingdoesnothousesystemsrequiredforsafeshutdown.Althoughitisthesourceforventilationairtootherroomsthatdocoatain4safety-relatedsystems,revisionsarecurrentlybeingmadetotheplanttoprovideoutsideairductstothesesystems.Theturbinebuildingventi1ationsys'emappears.tobeinaccordancewiththeacceptancecriteriaofSection2.0.4~5ENGINEEREDSAFETYFEATURESVENTILATIONSYSTEMSTheengineeredsafetyfeaturesventilationsystemsincludethoseventilat-ingandcoolingsystemsthatserviceequipmentrequiredfollowinganaccident.orneededtoassureasafeshutdownoftheplant.Equipmentand/orareasservicedbytheseventilatingandcoolingsystemsincludethefollowing='engineeredsafeguardequipment.orelayroomtillFranklinResearchCtnterhCNvbienotTheFankRnhackute TER~257M09obatteryroomsoauxiliaryandemergencysystemsodieselgeneratorrooms.4.5.1EnineeredSafuardientVentilationandCoolDefinitionandidentificationofthefollowingsafeguardsystemsaretakenfromtheQinnaFSAR:osafetyinjectionsystemocontainmentspraysystemohydrogenrecombiner.4.5.1.1Sa'fetyInjectionSystemThesafetyinjectionsystemactstolimitthereleaseoffissicaproductsfromthereactorfuelbymaintainingcorecooling.ThiskeepstheMe1inplace,limitingthemetal-waterreactiontoaninsignificant,amount.ThesafetyinjectionsystemiscomprisedofbothhighandlowpressureeXectricmotor-drivencentrifugalpumpslocatedonthebasementleveloftheauxiliarybuilding.Coolingofthepump-drivemotorsisbytworedundant,stand-aloneaircoolingunitsthataresharedwiththecontainmentspraypumpsandfromwhichthecooledairisductedtoapointadjacenttothecoolingintakeventsofeachdrivemotor.Thecoolingunitscompriseawater-cooledheatexchangerandablower.Servicewateristhecoolingmedium.Theredundant,molingunitsare'onnectedtothe1Cand1Delectricalmotorcontrolcentersthat,inturn,areconnected'eparatelytodiesel-poweredbuses14aad13,respec-tively,whenoffsitepowerisnotavailable.Asingleactivefailurewillnotcause.atotallossofcooling.Shouldtheservicewatersupplyfai1,themainauxiliarybuildingventilationsystemwillcirculateairtopreventarapidriseintemperature.Withalossofthispdrtionoftheauxiliarybuilding'sventilationsystem,thecoolerswillprovidemotorcoo1ingTheFRLRstatesthatthecoolersweredesignedtoSeismicClassI~~00FranMinReaearchCenterhDlvbbnot~Ftank5nheOute 2TERM5257-4094.5.1.2ContainmentSpraySystemThecontainmentspraysystemisanengineeredsafetyfeatureinitiatedbyasetofhighcontainmentpressuresignalsanddesignedtoreduce.thepressureandradioactivitylevelswithinthereactorcontainment.~Coolingofthep~rivemotorsonthebasementleve1oftheauxiliarybuildingisbytheredundant,servicewatermooledaircoolingunitssharedwiththesafetyinjectionpumpmotorsanddescribedinSection4.511ofthisreport.Inasimilarmannerasforthesafetyinjectionpumpmotorstthecoolingairisductedtoapointadjacenttothecoolingventsofthetwodrivemotors.Bythesamereasoningemployedforthesafetyinjectionpumpmotors,theventilationandcoolingsystemforthecontainmentspraypumpmotorsisconsideredtobesatisfactorywithrespecttotheacceptabilitycriteriadiscussedinSection2.4..5.1.3HydrogenRecombinerAsdescribedintheESAR,thehydrogenrecombinerconsistsoftwofull-ratedsubsystems,eachcapableofmaintainingtheambientHconcentrationat2V/0.Whiletheassociatedgaseousfuelandcombustorsystemsarenotservicedbytheventilationsystemsunderreviewinthestudy,thecontrolpanelislocatedintheintermediatebuildingandiscooledbythatbuilding'sventilationsystem.InresponsetoaquestiontotheGinnaplantengineeringstaffregardingtheventilationandcoolingneedsofthecontrolpanel,theLicenseehasrepliedthattheintermediatebuildingventilationshouldmaintaintheenvironmentintheareaoftherecombinerpanel.below104P.4.5.2~aelaRoomTherelayroomcontainstwoself-contained,watermooledheatpumpaircoolingunitsthatmaintainalow-normalroomtemperature.Powertothesecoolingunitsissupplied.bytheiBmotorcontrolcenterthattwhi1enotauto-matically'onnectedtotheemerge/cyAiesei~eneratedpower,intheeventofalossofoffsitepower'canbeconnectedbytheoperatortothedieselpowervia~bus15.Inaddition<afilteredwallventtoanoutsideairsourcewasnoted.-ll-(IPFranklinResearchCenterAOtaisi044dTbeF424Rkhlk4N24M4R

~)TER~257-409The.ventilationandcoolingsystemforthebatteryrooashasbeenmodifiedtoincludearefrigeratedairhandlingsystem.ThisequipaeatisLocatedinthemain.equipment(airconditioning)roomforthecontrol.room.Qoolairfromthissystemisductedtobothbatteryrooms.Whilethesystemrecizculatestheair,enoughnewairisintroducedtopreventanyappreciabLe,hydrogenaccumu1a-,tionintherooms.Forbackup,adcfan,'oweredby.thebatteries,suppliesairharemthecontrolroom'smainairhandlingroomtocatebatteryroomaadthroaghanormallyopenventintothesecondbatteryroom.Thevent,hetweeathetwobatteryroomsisequippedwithafiredamper.Isolationdampersaxeinc1udedontheblowersystem.Itshouldbenotedthat,atthetimeoftheplantvisiC~modiXicationswerebeing'madetoinstallanexhaustductthatwilldirect,theexhaustair1fromthemainairhandlingroomandbattery'roomstoanouCaideverinsteadofventingitintothelowerleveloftheturbinebuildingReference18indicatesthatadditionalbattery-poweredfansaretobe.installedinthefuturetoassurethatsufficientairhandlingcapacityisprovidedtomaintainthebatteryroomsatacceptableambientconditions4.5.4AuxiliaandEmerencSstemsFRCdefinedandidentifiedtheauxiliaryandemergencysystemsinaccordancewiththeFSAR.Thefollowingessentialsystemswereseeatorequireventilationand/orcooling.4.5.4.1ChemicalandVolumeControlSystemThechemicalandvolumecontrolsystemislocatedintheauxiLiarybuildingwhereitsventilationandcoolingneedsaresuppliedbytheauxiliarybuilding.ventilationsystem.rInadditionto..generalcoolingbyambient.air,'thechargingpampsarecooledbyredundantfan-drivenaircoolersusingservicewaterasthecoolingII'FranklInResearchCenterAOvinedTheFrsnl4nIraeutt q~EmergencyonsitediecoolingfansbymeansofcoolerondieselAandtheachcoolingunitissuffThecoolingunitsweClassIcriteria..Theauxiliarycoolanandthecomponentcoolingforreturntotheheatsink,LakeOntario.Theheatexchangersarelocatedonthebasementandintermediatelevels.of-.-.the.auxi1iary'-building.-andaddtotheoverallheatremovalloadoftheauxiliarybuildingventilationsystem.Theresidualheatremovalpumpsarelocatedir.apitbeneaththebasementfloorandarecooledbycoolerscomprised.of.Tin-type~service~ter-cooled,heatexchangersandelectricmotorMrivenfans.that-direct..the-.coolingairdirectlytothepumpsanddrivemotorventopenings:Thecoolershexadesignedandinstalledinaccord'ancewithSeismic-CLassC,dziteria't."..:tbe~eofplantconstruction.~Duringpost-accidentconditions-'.and.during..shutdownswhereoffsitepowerisnotavailabletheredundajsLwoaKng;.'ixniMare'ransferredautomaticallytoseparatediesel>>powecet%1$es.-'=~-,-Thecomponentcoolingwater;loopserai'as.t5eintermecKaryheatremovalsystem<removingheatfromtheresidu~'a@iemoval"3.oap'aswellasprovidingcoolingwatertomanyothercomponen(s+,Thi's,'-f.s~LWa-.systearessentialtoIIIPFranklinResearchCenter~.'.-.-'.+--.-.<-;I'~~;-.-.--..-W,-.'.+'.-.'.-'.TERM5257-409medium.ToassurethatthepumpsanddrivegutaiRirecjicxXed~>.thecooledairisducteddirectlytothemfromthecooXe'rs"',,=,~'.+"~;~"=-i.-,-'.--'el~enerated.~~~p1X~'aaMmatica11ytothemotor.-control~~atNO.~~:aha'=.XEk-~'s:-placesonee'otherondi'eS:.~ie$5~>>.Wecapacityoficient.to'aiagd~rccejiahM~frm&ng,temperaturesI~,lT"@4.5.4.2AuxiliryCoolantSystem..-~-,=,.4=;.".--+":=~~:-'.-2::-tsystem,compri.sed.ofthe:.resxdaid...heatremovalloopwater,loop,-'~ocaMQ:.4ii.~+~~nrybuildingandisasystemessentialtosafety.'e'..=";-'.'~g'.-,.:+"=-=-.'3~=.::==-'.:~WithintheresidualheatremovaL1cxip~,the.'1ectzi&mcrto~~iivenpumpscirculatereactor.coolantthroughhest.excbangeziMo:tiaimf~the.'heattothecomponentcoolingwatersystemwhich,inturn,transfersittoservicewater TER~257M09Theprimaryventilationandcoolingrequirementsofthecomponentcoolingwatersystemareassociatedwithits'irculationpumpmotors.Theaemotorsarelocatedonthemainoperatingflooroftheauxiliarybuilding+herecoolingis'providedbytheambientairoftheoperatingfloorprovide'dbytheauxiliarybuildingsupplyairhandlingunitfromanoutsideairsaaxceSincetheoperatingfloorisnotsubjectedtotheheatdissipationofthe-lowerfloorsandsinceitisclosetothesourceofcooledsupplyairftbsppumpmotorsofthecomponentcoolingwatersystemdonotrequireadditzeaalcoolingdirectedtothemotorvents.Whiletheventilationandcoolingsyst'emsfortheresidualheat,remova1andcomponentcoolingwaterloopsappeartosatisfytheacceptanceariteriafornormaloperationandtheusualscenariosofpost-accidentconcord:ions,thereisaconcernthattheresidualheatremovalsystem'couldbeaasceptibletoasinglefailure.Considerthepossibilityofamajorpumpsea3L3.eakoracoolantpiperuptureintheresidualheatremovalsysteminthepeeppitHighpressurereactorcoolantcouldbereleasedintothepumppitanalwouldflashtosteam,producingahot,highlyhumidatmosphere.PRC'sconcernisthatthisenvironmentmayproducefailuresinoneorbothresidualheatremovalpumpmotorsinthepittorendertheresidualheat.removalaysteminoperative.Asevere1eakcouldpossiblyaffecttheresidualheaCremovalpumpcoolingunitmountedimmediatelyabovethepumppitonthebasementfloor.Atthatlocation,thehighlyhumidatmospheremaybedrawnentothecoolersand,ifnotentirelycondensedbythecoolingcoils,retundacondensingatmospheretotheresidualheatremovalpumpmotorvents:4.5.43CirculatingWaterScreenHouseThecirculatingwatersystemprovides,bymeansoffoursafe~relatedservicewaterpumps,thewaterusedforheatremovalfromthereactorduringshutdownoperations.Ventilationofthescreenhouse,inwhichthe.service:waterpumpsarelocated,'isprovidedbyexhaustfansinthebui1diaigroofandmanuallycontrolledloweredventsindewalls.powertotherooKexhaustfansissuppliedvia-bus17that.isconnectablebyoperatoractiontothediesel-generatedpowerduringemergencies.tl(lFranklinResearchCenterADhhianofTh4FanonInstate

~~ITSR~257M09Anonsiteinspectionshowedthatwindowsanddoors(bothpersonnelandvehicleaccessdoors)maybeopenedtoincreasetheflowofambientairthroughthescreenhousewhennecessary.TheinspectionaLsorevea1edtheuseofportablefanstoincreasethecirculationofairaroundeachofthree.operatingservicewaterpumps.Althoughspecialmotorcoo1ingsystemswerestatedtobenotnecessaryfortheservicewaterpumps,it,appareat1yhasbeenadvantageouson.hotsummerdaystoreducethemotoroperatingtemperatureswjththeportablefans.4.5.5DieselGeneratorRoomsSincethetwodiesel-poweredgeneratorssupplyredundantonsiteelectricalpower,thedieselgeneratorsystemsareobvioua1ysafetyrelatedandmustbeservicedadequatelybytheirrespectiveventf1ationsystems.Thedieselgenerators(withassociatedelectricalswitchgear)arehousedinadjacent,butseparate,rooms,eachservicedbyaventilationsystem.Eachroomisventilatedbytwoinletfanssupplyingoutsideair,withonefanineachroomdischargingacopioussupplyofairdirectlyontheelectrical-switchgearcabinets.Excessairisdischargedthroughautomatic,pressure-actuatedroofvents.Norefrigerationorservicewateraircoolingisused.Eachventilationsystemisautomaticallyconnectedtoitsrespectivediesel-generatedpowersourcewhenthedieselsarestarted.Thisassuresacontinuationofventilationfor.equipmentcoolingandfortheremovalofanyhydrocarbongasses.Combustionintakeairtoeachdieselisviaseparateoutsideairsources.Heatingofeachroomisbyunitsteamheaters(twoperroom).Shouldoneofthesesteamlinesbreak,onlyitsrespectivedieselgeneratorwouldbeaffected.Theotherdieselwouldcontinueindependently,tosupplyemergencypowerwhilethesteamlineisbeingisolated.~I00FrenMinResearchCenterAOlvbkaotTheFrenkSnInakuce TEf~5257M09<<5<<CONCLUSIONS5<<1CONTROLROOMAREAVENTILATIONVentilationofthecontrolroomisnotreviewedheresinceitisapartofthegenericstudy<"ControlRoomHabitability<"beingreviewedunderTNZItemZII.D.3,4.Thatstudyistoassure.compliancewithlGCFR50,AppendixA<r"GroundDesignCrite'riaforNuclearPowerPlants,"Criteri'on19,ControLRoom."5~2SPENTFUELPOOLAREAVENTILATIONThespentfuelpoolareaventilationsystemincludingthedecontaaminationpitareawasnotconsideredtobeasafety-relatedsystemwithinthedefinitionofthisreview.Consequently,itwasnotreviewedindepthHowever<duringtheplantvisititwasnotedthattheexhaustairco11ectedalongthesideofthespentfuelpoolareawasmorerecentlyfittedwithefilterthatmayoperateasacharcoaland/orroughingfilter;DischargefromthisfilterisdirectedtothemainHEPAfilterintheauxiliarybuildingventilationsystem.5~3AUXILIARYBUILDINGANDRAGWASTEAREAVENTILATIONSYSTEMAlthoughtheventilationsystemductworkandspecialcomponentaircoolingunitsweredesignedandinstalledtoSeismicClassIcriteriaatthetimeofplantconstruction,thesystemgenerallyincludesnon-safetygradeequipment.Althoughtheanticipate'denvironmentsduringnormalplant.operation.andfollowingdesignbasisaccidentsincludeatmosphericpressureanda.temperaturerangeof504to104oF,safetygradeequipmentmustbeaddressed(seeSection5.6).Zngeneral,theventilationoftheauxiliarybuilding,appearstobe.adequateanddoespromotetheflowofairfromareasoflowradioactivitypotentialtoareasofhigherradioactivity-potential.Howev'er,'wocond'itionsexistthatcouldpossiblyviolateMatrequirement,bothofrhichoccurwiththemainexhaustfansshutdownwhenoffsitepowerisnot'availableandtheplantisoperatingonemergencydieselpower0IIFranklinResearchCenterADlvbbnotTheFranklinhedge IIvTER~257M09IThefirstconditionisoneinwhichexhaustair,withahigherradio-activitypotential,couldleakintotheintermediatebuildirag.housingthe.controlledaccessarea.Withthemainexhaustfansshutdown,thepositivepressurecreatedontheinputsideoftheHEPAfiltercouldcauseexhaustleakageintotheintermediatebuildingifthereisinsufficientpartialvacuuicreatedbytheplantventstack.Thesecondpossibilitycouldoccurunderthesamemainexhaust.fanshut-downconditionswiththeplantv'entstackprovidinginsufficientpartialvacuumonthesystem.WithfourseparateexhaustsubsystemsdischargingtoacommonpointattheHEPAfilterinput,itispossiblethat,theflow-pressurecharacteristicsofthefanscouldbesufficientlymismatchedtoproducebackflowthroughanoperatingfan(isolationdampersopen)andthusintroducehigherradioactiveexhausttoanareaofgenerallylowerraiUnactivitypotential.Itisrecommendedthatbothpossibilitiesbeinvestigatedtoassurethat~exhaustairalwaysflowsfromareasoflowradioactivitypotentialtoareasofhighradioactivitypotential.5~4TURBINEBUILDINGWhileitdoesnothousesystemsrequiredforsafeshutdown,theturbinebuildingdoesserveasthesourceofairforventilationtothecontrolroom'sHVACsystemequipmentroomandthebatteryrooms.Howeverduringtheplantvisit,modificationswereobservedthatwillprovideoutsideairtotheseareasaswellasreturntheirexhausttoanoutsideventTheturbinebuildingventilationsystemappearstosatisfytheacceptancecriteriacitedherein.55ENGINEEREDSAPETYPEATURESVENTILATIONTheengineeredsafetyfeaturescoveredinthisrevieware:oengineeredsafeguardequipmentsafetyin)'ectionsystemcontainmentspraysystemIllFranklinResearch'enter.ADHskonafTheFreonInsense TER~257-409hydrogenrecombinerorelayroomobatteryroomsoauxiliaryandemergencysystemschemicalandvolumecontrolsystemauxiliarycoolantsystemcirculatingwaterscreenhouse'~dieselgeneratorroomsEquipmentcoolingusingeitherrefrigeratedorservicewateraircoolingsystems,asrequired,isthemainsub)ectafthisreviewundertheengineeredsafeguardequipmentandtheauxiliaryandemergencysystemscategoriesRedundantemergencybus-poweredcoolersusedfortheseequipmeatitemsweredesignedandinstalledtoSeismicClassIcriteriaatthetimeofplantconstruction.Nootherquali.ficationdocumentationwasnotedTherelayandbatteryroomsemployrefrigeratedaircoolingoftheroomsratherthancoolingofspecificequipment.Thehistoryofperfcmaanceissaidtobegood.QualificationincludesSeismicClassIcriteria.Thedieselgeneratorroomsareventilatedbytwooutsideairsupplyfanswithonefanductedtodischargeoutsideairdirectlyonthee1ectrica1switchgearcabinetineachroom.Powerforthefansisautomaticallyswitchedtothatroom'srespectivediesel-generatedpowerwhenthedieselsarestarted.Excessairfromeachroom.isexhaustedthroughpressure-actuatedroofvents.Theventilationsystemsfortherelayroom,dieselgeneratorrooms,chemicalandvolumecontrolsystem,andthecirculatingwaterscreenhouseappeartosatisfytheacceptancecriteriacitedhere.AsdiscussedinSection4.54.2<theventilationandcoolingsystemsfortheresidualheatremovalsystemappeartosatisfytheseacceptancecriteriaexceptforconsiderationofamajorsealleakorpiperuptureintheresidualheat'emovalpumppit.Forthis.condition;concernwasexpiessedinSection4.5.4.2thatthehothumidenviron'mentin"roducedtothepumppitcouldcausebothoftheredundant(parallel)pumpmotorstofail,thatis,theresidual9PFranklinResenrchCenter TER~257M09heatremovalpumpingsystemcouldbesusceptibletoasinglefailure.ItisrecommendedthattheLicenseeinvestigatethispossibilityingreaterdepth.5~6SAPETYGRADEEQUIPMEHTA"safetygrade"systemsasdefinedbyNUREG-0138,isonethatisqualified'oSeismicCategoryI(RegulatoryGuide1.29)andqualitygroupCorbetter(RegulatoryGuide1.26)andisoperatedbyelectricalinstrumentsandcontrolsthatmeetIEEEcriteriafornuclearpowerplantprotectionsystems(IEEEStd279)~TheGinnaplantwasconstructed,forthemastpart,priortotheissuanceofthesedocuments;asaconsequence,muchoftheequipaentusedintheventilationsystemsis.notdocumentedtobeofsafetygrade'Ther'efore,the.Licenseeis'encouragedtodeterminewhichoftheseventilationsystems,ifany,arerequiredtoenablethesafetyequipment,locatedintheareasserviced,toperformtheirrespectivefunctions.Ifitisdeterminedthatventilationisrequiredforanyofthesafetysystemsthusserviced,thentheappropriateupgradingofitsassociatedventilationequipmentshouldbeconsidered.~gOtjFranklinResearchCenterADhblondTheFnnk5nheOute TKRM5257M096REPERENCESl.10CPRPart50,AppendixA,GeneralDesignCriterion2,DesignBasisforProtectionAgainstNaturalPhenomena"2.10CPRPart50,AppendixA,GeneralDesignCriterion4,,"EnviroamentalandMissileDesignBases"310CPRPart50,AppendixA,GeneralDesignCriterion5gShar~ofStructures,SystemsandComponent4.StandardReviewPlan,Section9.4.1,"ControlRoomAreaVenti1ationSystem"5.StandardReviewPlan,Section9.4.2,"SpentFuelPoolAreaVenal'ationSystem"6.StandardReviewPlan,Section9.4.3,"AuxiliaryandRadwaste.AreaVentilationSystem"7;StandardReviewPlan,Section9.4.4,"TurbineAreaVentilationSystem"8.StandardReviewPlan,9.4.5,"EngineeredSafetyFeatureVentilationSystem"9.StandardReviewPlan,Section9.5.1,"PireProtectionSystems""10.RegulatoryGuide1.13;"SpentFuelStorageFacility'DesignBasis"11.RegulatoryGuide1.26,"QualityGroupClassificationsandStandardsforWater,SteamandRadioactive-Waste-ContainingComponentsofNuclearPowerPlants"12.RegulatoryGuide1,29"SeismicDesignClassification"13.RegulatoryGuide1.105<"InstrumentSetpoints"14'.RegulatoryGuide1.117,"TornadoDesignClassification"15.BranchTechnicalPositionASB9.5-1,"GuidelinesforFireProtectionforNuclearPowerPlants"16.SEPTopicVII-3<"SEPReviewofSafeShutdownSystemsfortheREGinnaNuclearPowerPlant,Revision2,"April19S117.SEPTopicVII-3r"Electrical,instrumentationandControlPeaturesofSystemsRequiredforSafeShutdown,"FinalDraft,Pebruary1981'9FrankDnResearchCenterAPlvhdnofliceFranNnInsCute-20-

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