ML17037A686
ML17037A686 | |
Person / Time | |
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Site: | Nine Mile Point ![]() |
Issue date: | 02/06/2017 |
From: | Niagara Mohawk Power Corp |
To: | Office of Nuclear Reactor Regulation |
References | |
Download: ML17037A686 (1) | |
Similar Documents at Nine Mile Point | |
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Category:Report
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NMPNS-2TABLE7.2-1(CO>VZ'D)LineIsolatedPrimarycontainmentsamplereturnMSLIVwatersealsystemNumberofLinesApproximat,ePipeSize,In.1/2ValvesPerLineGroupAAValveLocationRelativetoPrimaryContainmentInsideOutsideInsideOutsideValveand/orOperatorType(6)SOvalveSOvalveMOMOPowertoOpen(5,6)A-cD-cA-cD-cPowertoClose(5,6)SpringSpringA-cD-cIsolationSignalA,FA>FClosingTime(7,11,12)StandardStandardNormalStatus(9,10)OpenOpenCloseelClosedRemarksA5Thesenotesarekeyedbynumbertocorrespondtoparentheses.NOTES1,Mainsteamisolationvalveswillrequirethatbothsolenoidpilotsbede-energizedtoclosevalves.Accumujatorairpressureplusspringsettogethertoclosevalveswhenbothpilotsarede-energized.Voltagefailureatonlyonepilotwillnotcausevalveclosure.Thevalveswillbedesignedtofullycloseinlessthan10seconds.2.Containmentsprayandsuppressioncoolingvalveswillhaveinterlocksthatallowthemtobemanuallyreopenedafterautomaticclosure.Thissetupwillpermitcontainmentspray,forhighdrywellpressurecon-ditions,and/orsuppressionwatercooling.Whenautomaticsignalsarenotpresentthesevalvesmaybeopenedfortestoroperatingconvenience.3,Testablecheckvalveswillbedesignedforremoteopeningwithzerodifferentialpressureacrossthevalveseat.Thevalveswillcloseonreversefloweventhoughthetestswitchesmaybepositionedforopen.Thevalveswillopenwhenpumppressureexceedsreactorpressureeventhoughthetestswitchmaybeforclose.4.Controlrodhydrauliclinescanbeisolatedbythesolenoidvalvesoutsidetheprimarycontainment.Linesthatextendoutsidetheprimarycontainmentwillbesmalland.terminateinasystemthatisdesignatedtopreventout-leakage.Solenoidvalvesnormallywillbeclosecl,buttheywillopenonrodmovementandduringreactorscram.5.A-cmotoroperatedvalvesrequiredforisolationfunctionsshallbepoweredfromthea-cstand-bypowerbuses.D-coperatedisolationvalveswillbepoweredfromthestaticnbatteries.6.Allmotoroperatedisolationvalveswillremaininthelastpositionuponfailureofvalvepower.Allairoperatedvalveswillcloseonmotiveairfailure.7.Thestandardminimumclosingrateforautomaticisolationvalvesvillbebased.onanominallinesizeof12in.Usingthestandardclosingrate,-12in.linewillbeisolatedin60seconds.Con-versiontoclosingtimecanbemadeonthisbasisusingtheactualsizeofthelineinwhichthevalveisinstalled.[A5Ag9.Valvecanbeopenedorclosed,byremotemanualswitchforoperatingconvenienceduringanymodeofreactoroperationexceptwhenautomaticsignalispresent.10.Normalstatuspositionofvalve{openorclosed)isthepositionduringnormalpoweroperationofthereactor(see"NormalStatus"column).12.Minimumclosingrateisbasedonvalveandlinesize.11.Thespecifiedclosureratesareasrequiredforcontainmentisolationonly.5of6