Transcription of CHAPTER 4
1 :HeatTransportSystemsModuloA:MainCircuit CHAPTER4:HEATTRANSPORTSYSTEMTheHeatTrans portSystemconsistsofthefollowingsUb-syst ems: themaincircuit:transportsheatproducedbyt hereactortothesteamgenerators; thepressureandinventorysystem:maintainst herequiredpressureinthemaincircuitandpro videsmake-upwatertoandholdstheexcessinve ntoryforthesystem; shutdowncoolingsystem:removesreactordeca yheatfollowingshutdown; purificationsystem:controlsthechemistryo fthereactorcoolant.. t.'..: : .. REACTCR + :page4A- 2 MODULEA:MAINCIRCUITC hapter4:HeatTransportSystemsModuleA:Main CircuitAttheendofthismodule,youwillbeabl etodescribethefollowingfeaturesofa ; ; 3 Chapter4:HeatTransponSystemsModuleA:Main Circuit t1 11 10.
2 : thereactorfuelchannelstothesteamgenerato rs,wheretheheatis transferredtolightwatertoproducesteam;pr ovidesCOOLING ofthereactorfuelatalltimesduringreactoro perationandprovidesforthecoolanttoremove decayheatwhenthereactorisshutdown;eachhe attransportpumphassufficientrotationalin ertiasothattherateofcoolantflowreduction matchestherateofpowerreductionfollowingt hereactortripifpowertothepumpmotoris lost;allowsdecayheatremovalbynaturalcirc ulationundertotallossofpumpingpower;limi tstheeffectofpostulatedloss-of-coolantac cidentstowithinthecapabilityofthesafetys ystemsandprovidesa pathforemergencycoolantflowtothereactorf uelintheeventofsuchanaccident.
3 ProvidesCONTAINMENT forfissionproductsthatmaybereleasedfromd efectedfuelduringnormaloperatingconditio ns; theheattransportsystemis seismicallyqualifiedtothedesignbasiseart hquake. ,GeorgeBereznaipage4A- 4 Chapter4:HeatTransportSystemsModuleA:Mai nCircuitl~';="=>r-E:J(J/"-1I) ' ,.rhIf-c'""'-~I--!I-IL.~~~~ ~IIREACT""J:i~-~'"Ii-0_IiIi-~--~L~1+~ '='=~---,.. ::)~..,.. : twocross-connectedfigure-of-eightloops; 480pressuretubeswithindividualinletandou tletfeederpipes; fourreactorinletheaders; twoorfourreactoroutletheaders; fourmotordrivenpumps; foursteamgenerators; interconnectingpiping; ~earTechno~ 5 Chapter4: maincircuitpressuremustbemaintainedsotha t:~thereis adequatesaturationmarginin thereactoroutletheaders~therequirednetpo sitivesuctionheadforthecirculationpumpsi s provided themaincircuit mustbefilled,exceptunderspecificshutdown conditions.
4 Continuousflowtoprovidecoolingofthefueli s ~=~BoilerROH10 MPaeasttowestchannelsDepartment( :HeatTransportSystemsModuleA:MainCircuit 11I'IJ' "nHJSTD6C10 SPl\CERCOUf"lJlNQ;"'""""STAHO".. ' !ISPANARYMECHA." \".. "11 WIJ1 UPP AOILI"OTC(M!A2 UPPER8 EAAINGOILPOT3nRJSTl!lEAl'UNQ~4 DOWN'DAJCTBfNtNBII UPlIftJIT8 EAAlNQ UPPERKNI~ '"""" \~I"ES12 MAIN rewlNAL9CX13 AJROUCT14 IJRCUC'r15 FAHFWNQ11 SlATORCOFIf'AlSa&Y Thefourheattransportpumpsarevertical,sin gle-stage,single-suction,single-discharg ecentrifugalpumps. Thepumpbearingis ,abovethebearing, ,filtered, leakagerecoverycavity,locatedbetweentheu ppermostmechanicalsealandthebackupseal,r outesthenormalsealleakageandleakagefroma failureofallthreemechanicalseals, drivenbya vertical,totallyenclosed, ,supplementedbyinertiapacketsin themotorsothat,onlossofpower, :HeatTransportSystemsModule8:Pressureand InventoryControlCHAPTER4:HEATTRANSPORTSY STEMMODULEB:PRESSUREANDINVENTORYCONTROLS YSTEMMODULEOBJECTIVES:Attheendofthismodu le,youwillbeabletodescribethefollowingfe aturesofa.))
5 "normal"and"solid" : : Controlsthepressureandheavywaterinventor yin > >Accommodatesheattransportsystemcoolants wellandshrinkageassociatedwithwarmup,coo ldown, >Providesforsuitableheattransportsystemp ressurerecoveryfollowingsuddenpressurere ductionduetopowerreduction,suchasatripor a >Limitspressurereductionin >Providesoverpressureprotectionforthehea ttransportsystemforallmodesofoperationan dameansofcontaininganyrelieffromtheheatt ransportsystemin theshortterm. Providesadequatenetpositivesuctionheadfo rtheheattransportheavywaterfeedpumpsduri ngnormalreactoroperation.
6 Minimizesoutflowofheattransportcoolantdu etothefailureofassociatedval'/es. Providestheheattransportpurificationsyst emwitha coolheavywaterflow. Providesforthestorageofadequateamountsof heavywaterfornormaloperatingconditions. Providesa :HeatTransport::.ystemsModuleB:Pressurea ndInventoryControlMainHeatTransportCircu itSteamBleedValveHeatTransportPurificati onSystemBleedValveBleedCondLviControlVal veRefluxValveDirectFeedValveD20 FeedPumpBleedCondenserRV020 StorageTankSYSTEMCOMPONENTST hemaincomponentsofthepressureandinventor ycontrolsystemare:pressurizerbleedconden serbleedcoolerstoragetankpurificationcir cuitpressurizingpumpsfeed,bleedandrelief valvesconnectionstothemaincircuit pressure,levelandtemperaturecontrolcircu its :HeatTransportSystemsModuleB.
7 PressureandInventoryControl3. PRESSURIZERT hepressurizeris valveis 'sliquidandsteamarekeptatsaturation,anda t:apressurethatis slightlyhigherthanthesaturationcondition sinthereactoroutletheaderat100% (andhenceheattransport)pressurecanberais edbyaddingheattotheliquidviaelectricheat ers,andthepressurecanbereducedbybleeding steamoutofthe ~ $fROSTlAMBLEEDCV'sPRESSURIZERSPRAYVALVET OREACTOROUTLETHEADER,..".. ;D-ILI(TIU( ;i_Il~~_"IATm~--=.--=-Ifthepressureincre asesbeyondtherangeofpressurizerpressurec ontrolvalves,twosteamreliefvalvesdischar gesteamtothebleedcondenseruntilthepressu reis ,coolheavywaterIs reactorpowerincreasetheoutletheaderpress urerisesasa resultoftheswellin thepressurizerincreasesautomaticallysoth atalltheswellresultingfrompowerincreases is storedin thepressurizer(andhencetheheattransports ysteminventory)is normallycontrolledviathemaincircuitfeeda ndbleedvalves.))
8 :HeatTransportSystemsModuleB:Pressureand InventoryControl4. BLEEDCONDENSERU nderhighpressureconditionsinthepressuriz erand/orthemainheattransportcircuit,pres surereliefisviaflowintothebleedcondenser (alsoknownasthedegassercondenser). ,f,UM'OISCHAAO(Nil' :.:=n__Jfll:OMuun".. ,' 6 Chapter4:HeatTransportSystemsModuieB:Pre ssureandInventoryControlHeatTransportPre ssureControlk__ "normalmode"r--pressurizerlevel~,,,I ,,,, 'ROHpressureMainHeatTransportCircuit,IHe atTransportPressureControl"solidmode"III IIIFeedIValveI- - --~<--iIIIIIIIB leedIIValve____>~ Inventorycontrolfortheheattransportsyste mis achievedbyfeedandbleed,withtheexcessinve ntorybeingsuppliedfromorstoredin the020 Storagetank.)
9 In"normalmode", ,feedandbleedflowsarecontrolledbythepres surizerlevelcontroller; WhenthePressurizeris isolatedfromthemaincircuit,typicallyunde rwarm-upandcool-downconditions,heattrans portpressurecontrolis "solidmode".Compressibilityoftheheattran sportsystemat250 Cis in theorderof4 MPa/m3 Inthe"solidmode"feedandbleedflowsarecont rolledbytheheattransportreactoroutlethea derpressurecontroller;PressurizerDepartm entofNuc~arTechno~ : ,Pressurizersteambleed&reliefBCLevelCont rolValveMainHeatTransport1+---1~'I--ICir cuitBleedCoolerBleedCondenser 2 StorageTank11 BCSprat::ValveBCpressurecontrolvalves1-- -IBleedflowis condensedin providedbya refluxcoolingtubebundlecarryingfeedflow, thebleedcondenserat requiredflowthroughfeedcontrolvalvestoth eheattransportsystemviatheheattransportp umpsuctionline.
10 ;page4B-8 Chapter4:HeatTransportSystemsMOduleB:Pre ssureandInventoryControl Theheavywaterstoragetankservesastheheadt ankforthefeedpump$.Duringinitialwarmupto 100 C,theheavywaterswellfromtheheattransport systemis accommodatedin Thedownstreamheavywatertemperaturemustbe sufficientlylowtoensurefeedpumpnetpositi vesuctionheadandtoavoiddamagetotheionexc hangeresinin thepurificationcircuit. Over-temperatureprotectionis providedbyoverridecontrols,whichclosethe bleedcondenserlevelcontrolvalvesonhighte mperatureat :HeatTransportSystemsModuleB:Pressureand InventoryControlIl' ~ '- 'I~ '8 Beraznalpage4C- 1 ModuleC:Wann-upandC;ooldowhCHAPTER4: heat TRANSPORTSYSTEMMODULEC:WARM-UPANDCOOLDOW NMODULEOBJECTIVES:Attheendofthismodule, ; ; ( 2 Chapter4:HeatTransportSystemsModuleC:War m-upandCooldownSHUTDOWNCOOLINGSYSTEM Coo)
