ML17265A315

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Proposed Tech Specs Basis Re Main Steam Isolation Setpoint
ML17265A315
Person / Time
Site: Ginna Constellation icon.png
Issue date: 06/04/1998
From:
ROCHESTER GAS & ELECTRIC CORP.
To:
Shared Package
ML17265A313 List:
References
NUDOCS 9806100267
Download: ML17265A315 (4)


Text

ESFASInstrumentation B3.3.2BASESAPPLICABLE SAFETYANALYSES, LCO,andAPPLICABILITY c.SteamLineIsolation

-Containment Pressure-HihHih{continued)

Containment Pressure-HighHighmustbeOPERABLEinMODESI,2,and3,becausethereissufficient energyintheprimaryandsecondary sidetopressurize thecontainment following apipebreak.Thiswouldcauseasignificant increaseinthecontainment

pressure, thusallowingdetection andclosureoftheMSIVs.'he steamlineisolation FunctionmustbeOPERABLEinMODES2and3unlessbothMSIVsareclosedandde-activated..

InMODES4,5,and6thesteamlineisolation FunctionisnotrequiredtobeOPERABLEbecausethereisnotenoughenergyintheprimaryandsecondary sidestopressurize thecontainment totheContainment Pressure-HighHighsetpoint.

d.SteamLineIsolation

-HihSteamFlowCoincident WithSafetIn'ectionandCoincident WithT,-LowThisFunctionprovidesclosureoftheMSIV~~tap>c-duringanSLBorinadvertent openjggofGatmospheric relieforsafetyvalv~omaintainatleastoneunfaulted SGasaheatsinkforthereactor,andtolimitthemassandenergyreleasetocontainment.

~sp~gc4AOomoQLcValue<~a~4own~~hi~e~~Pc)~privyW~~Xou4~~~g~()oazpy'g)~R~%~~,R~~~~~+ime.)t~fog-rpg~c-~a+~(0(4P414~(Kf)~~~t~4~~s~~~lezi+~<8~~4%m~Qg~'g4ic~Q(~cL>>4~+'p~~~~~~~~K((p,o~~Ah~ca~hQ@oAi+<~tg~colLkpA.ug~g, u3ChLCM~~~i~~~i'll~~<~/~~~~~Q~~~~~~~'~M~~~~

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R.E.GinnaNuclearPowerPlantB3.3-82Revision69806i00267

'F80604PDRADOCK05000244P'DR rgJ ESFASInstrumentation B3.3.2BASESAPPLICABLE SAFETYANALYSES, LCO,andAPPLICABILITY d.SteamLineIsolation

-HihSteamFlowCoincident WithSafetInectionandCoincident Wi'thT-Low(continued) e.ThisFunctionmustbeOPERABLEinMODESI,2,and3whenasecondary sidebreakorstuckopenvalvecouldresultinrapiddepressurization ofthesteamlines.TheSteamLineIsolation Functionisrequiredtobe,OPERABLEinMODES2and3unlessbothMSIVsareclosedandde-activated.

ThisFunctionisnotrequiredtobeOPERABLEinMODES4,5,and6becausethereisinsufficient energyinthesecondary sideoftheplanttohaveanaccident.

SteamLineIsolation

-HihHihSteamFlowCoincident WithSafetIn'ectionThisFunctionprovidesclosureoftheIVsdurinateamlinebreaor>nartentopeninanSGatmoserrelicsafevalvoma)ntainateastoneunaultedSGasaeatsinkforthereactor,andtolimitthemassandenergyreleasetocontainment TwosteamlineflowchannelspersteamlinearerequiredtobeOPERABLEforthisFunction.

Thesearecombinedinaone-out-of-two logictoindicatehigh-highsteamflowinonesteamline.FT-464andFT-465arethetwochannelsrequiredforsteamlineA.FT-474andFT-475arethetwochannelsrequiredforsteamlineB.Eachsteamlineisconsidered aseparatefunctionforthepurposeofthisLCO.Thesteamflowtransmitters providecontrolinputs,butthecontrolfunctioncannotinitiateeventsthattheFunctionactstomitigate.

Therefore, additional channelsarenotrequiredtoaddresscontrolprotection inact'icsuKk(n~~u~mi~+~~(D~rWw'g~(>0W'l4o~s,~uv.~~~vsm~~~M%+iv~.g~nn~E~~,~g~~M~3tgmo3.+mMmg.~m~uv-i.'~~~

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