unit 20 auxiliary feedwater system辅助给水系统

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1、UNIT20AUXILIARYFEEDWATERSYSTEM辅助给水系统1.     Theauxiliaryfeedwatersystemsupplieswatertothesteamgeneratorsinordertomaintainawaterinventoryforremoval-oftheheatenergyfromthereactorcoolantsystembysecondarysidesteamreleaseintheeventofinoperabilityofthemainfeedw

2、atersystemorduringstartupandshutdown.在失去主给水或电站启动、停堆期间，辅助给水系统向SG提供给水，即导出一回路热量而所需的二回路给水量。2.     Theauxiliaryfeedwatersystemhasadequatecapacitytomaintainthereactorathotstandardandthencoolthereactorcoolantsystemtothetemperatureatwhichtheresidualheatremovalsy

3、stemmaybeplacedinoperation.辅助给水系统具有足够的能力来维持热停堆，然后冷却主系统直至停冷系统可以投入。3.     Theauxiliaryfeedwatersystemprovidescompleteredundancyinpumpcapacityandwatersupplyforallcaseforwhichthesystemisrequired.任何时候，当系统需要时，辅助给水系统都具有足够的冗余(泵和供水管线)。4.     Theauxiliaryfeedwater

4、systemnormallyhastwomotor-drivenpumpsandoneturbine-drivenpump.辅助给水系统通常有2台电动泵和1台汽动泵。5.     Theelectric-motor-drivenpumpsarepoweredbyoffsiteandonsitesource,theturbine-drivenpumptakessteamfrommainsteamline.电动辅助给水泵由厂外和厂内电源供电，汽动泵的蒸汽来自主蒸汽管道。6.     Thepreferred

5、sourcesofwaterforallauxiliaryfeedwaterpumpsarethecondensatestoragetanksfromwhichwaterisfedtothesteamgeneratorbygravity.所有辅助给水泵的第一水源为凝结水箱，通过重力流向辅助给水泵后再向SG供水。7.     Intheeventthatcondensatestoragetankisnotseismicallyqualified,anemergencywatersupplytankbepr

6、ovidedasabackup.由于凝结水箱的抗震能力不够，配置应急给水箱作为备用。8.     Anunlimitedbackupwatersupply,essentialrawcoolingwatersystem(orcalledservicewatersystem)issuppliedtotheauxiliaryfeedwatersystem.另一路的备用水来自原水系统（或称为厂用水），当需要时可以不间断地向辅助给水系统供水。9.     Sincetheessentialrawcoolingwa

7、tersystemsuppliespoorqualitywater,itisnotusedexceptinemergencywhenthecondensatesupplyisunavailable.由于原水系统的水质得不到保证，除非在凝结水不可用的紧急情况下才使用。10. Inaddition,thefireprotectionsystemmaybeconnecteddownstreamofeachmotordrivenpumptoprovideanunlimitedsupplyofrawwaterdi

8、rectlytothesteamgeneratorsintheunlikelyeventofthesitebeingflooded.另外，在每台电动辅助给水泵的下游可联接火灾保护系统(指消防水系统)，当现场被水淹的时候，仍能不断向SG提供原水。11. Theauxiliaryfeedwaterisdesignedtostartautomaticallyanditwillsupplysufficientfeedwatertopreventth