内容案例成果1bcfc

DraftedCheckedReviewedApprovedB SYSTEMMANUAL-EUFCHAPTER3GENERALDESIGNProject文件类型Sub-ItemEngineeringSBA:B:√C: 中广核工程设计NationalAgradeengineeringCertificationNO: NationalAgradeengineeringCertificationNO:内部编码InternalThisisthepropertyofCNPDCItmustnotbeused、reproduced、transmittedordisclosedwithoutthepriorwrittenpermissionofCNPDC本文件之属于中广核工程设REVISIONDraftedCheckedReviewedApprovedA竹B竹SYSTEMMANUAL-EUFCHAPTER3GENERALDESIGN JAN.,AB3Addthedescriptionofscrubbing4AddthedescriptionofRupturedisk4AddthedescriptionofCombinechemicalsolutionfeedsystemAllthemodificationhasbeenmarkedbyunderline.SYSTEMMANUAL-EUFCHAPTER3GENERAL Rev Designbasesandsafety Designofthe Equipmentenvironment Containments Radioactivity SAMG(SevereAccidentManagement Equipment Containmentisolation Scrubbing Throttling Rupture Combinechemicalsolutionfeed Choiceofmaterial– DesignbasesandsafetyDesignoftheTheEUFsystemisdesignedtomeetthefollowingReferencePRCOtherHAF,HAD2.SeeEquipmentclassification -CodesandRCC-PConditionsincaseoftotallossoftheActivecomponentEmergencypowersupplyNotnecessarySeparationofredundantActive5.2Externalattacksagainstwhichthesystemis-PipeAirneSafeshutdownNotApplicableNotApplicableNotApplicableNotApplicableNotApplicableYes(OnlyforsafetyrelatedYes(OnlyforsafetyrelatedNoxiousvapoursorgases(otherthanthosecausedbyfire)Liquids(escafrombreaksinthepiIonizing5.3AttacksonotherPipeNoxiousvapoursorgases(otherthanthosecausedbyfire)FloodingIonizingNotnecessaryNotnecessaryNotnecessaryNotNotnecessaryNotYes(Duringsevereaccidentafterthesystemputintooperation)6.1In-service6.2Periodic6.3Yes(incontrolled6.4ProtectionagainstPartofthesystem(containmentisolationvalves)shallwithstandallaccidentconditions,cumulatedwithasafeshutdownearthquake,withoutlossoftheirintegrityincompliancewithRCC-Psubparagraph.1.EquipmentenvironmentThedesignofsystemequipmentandbuildinghasconsideredtherequirementofradioactivityshielding.Notnecessary.Duringnormaloperationoftheunit,majorsystemcomponentsshallbeaccessibleforperiodicinspection.AllprovisionsshallbemadetoenablerepresentativeteststobeperformedonallsystemContainmentsContainmentpenetrationsshallbedesignedinaccordancewithRCC-P.2.SincethesystemisdirectlyconnectedtothecontainmentatmosphereitshallbeensuredleaktightinaccordancewithRCC-Psubparagraph.3whichrequiresthatanisolationmechanism(twoisolationvalvesinseries)beprovided.Thesystemisdesignedtominimizeradioactivityreleasestotheenvironmentduringsevereaccident.Theradioactivityreleasetotheenvironmentismonitoredbymeansoftwodifferentsensors.SAMG(SevereAccidentManagementDuringsevereaccident,whenthecontainmentpressureexceedthedesignvalue,thesystemshouldbeputintooperationbytheoperatoraccordingtoSAMG.ContainmentisolationTheContainmentFiltrationandExhaustSystemhastwocontainmentisolationvalves(1EUF001VA,1EUF002VA；2EUF003VA,2EUF004VA)inseriesoutsidethecontainmentforeachunit(Unit1&Unit2).Thesefourcontainmentisolationvalvesareremotemanualcontrolvalves,whichwillbeoperatedbehindtheshieldingwall.ScrubbingThemaincomponentofthecontainmentfiltrationandexhaustsystemisthescrubbingThescrubbingunitincludestwoseparatefiltervessels,thefirstisventurifilter,andtheotherismetalfibrefilter.Thedimensionsofthescrubberpressurevessels(venturiandfiltervessel)werechosensuchthatlowflowariseinthespacedownstreamthescrubbingliquidpoolandthemetal-fiberfilterunit,therebyminimizingscrubbingliquiddropletcarryoverintothemetal-fibrefilters.TheVenturifilterhasasmallnumberofsubmerged,shortventurinozzles.Theventgasflowcontainingaerosolsandiodineisacceleratedtohighspeedvalues(app.220m/s)atthethroatoftheventurinozzles,causedbytheincreaseddynamicpressureof/gasThescrubbingliquidiscomposedof0.5%NaOHand0.2%Na2S2O3,providinghighwatersurfaceandasaconsequencehighretentionratesofthefissionproducts.MetalfibreThemetalfibrefilterunitcomprisesapre-filterfordropletseparationandafinefilter.Thepre-filterretainsscrubbingliquiddropletsstillpresentintheventgasflowinitsstainlesssteelfibrefabric.Thelargerdropletsthusstrikeanimementteandarereturnedascondensatetothescrubbingliquidpool.Themetal-fibremicro-aerosolfilterdirectlyinstalleddownstreamofthepre-filterremovesthesmalltyofmicro-aerosolsstillremainintheventgas.ThrottlingThethrottlingorifice,whichisequippedintheoutletlinebetweentheventuriscrubberandthestack,isdesignedtomaintaintheoptimalretentiongasvelocitiesintheventuriscrubberandmetalfiberfiltersection.Thisoccursafterthecriticalpressurehasbeenreachedatthethrottlingorifice.Anyfurtherincreaseinthepressureleadstoanincreaseinventgasdensity,sothatthegasvelocityintheventurinozzlesandthefilterunitsremainsconstantintheoptimalretentionregime.RuptureTherupturediskisequippedintheoutletlineafterthethrottlingorifice(9EUF001DI).Whenthepressureofthemetalfibrefilervesselincreasetoapprox0.08MPa(g),therupturedisk(9EUF001DK)willbebursted.CombinechemicalsolutionfeedThe“combinechemicalsolutionfeedsystem”issetupintheEUF