ML17319A960

Pressurizer Venting Operation.

ML17319A960
Person / Time
Site:	Cook
Issue date:	03/31/1981
From:	INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:
Shared Package
ML17319A959	List: ML17319A958 ML17319A960 ML17319A961 ML17319A962 ML17319A963 ML17331A772
References
AEP-AMP, PROC-810331-01, NUDOCS 8107210420
Download: ML17319A960 (18)

Text

-PRESSURIZERVENTINGOPERATIONAEP/AMPREYISION0MARCH19818107210420810715PDRADOCK05000315F'DR

~1 PRESSURIZERVENTINGOPERATIONA.PURPOSETheobjectiveofthisinstructionistospecifytherequiredoperatoractionsandprecautionsnecessarytoventnon-condensiblegasesfromthepressurizervaporspace.Thisinstructionmayalsobeusedasanalternatemethodofdepressurizing'thereactorcoolantsystemwhichmayberequiredbytheactionsofanotheroperatinginstruction.B.INITIALCONDITIONSCAUTION:Thepressurizerventshouldrot'beusedastheprimarymeansofdepressurizingtheRC$duringaninadequatecorecoolingevent.RefertoInadequateCoreCoolingGuidelines-forappropriateoperatoractionsandprecautions.NOTE:Thisguidelineassumesthatthereactorcontainmentconditionsarenearnormal"nd:anaccuratepressurizerpressureandlevelindication<isavailable.CAUTION:DonotopenthepressurizerventwhilethesafetyinjectionsystemisinoperationunlessanRCSdepressurizationisrequiredbyanEmergencyOperatingInstruction.1.Samplinghasindicatedthepresenceofasignificantquantityofnon-condensiblegasesinthepressurizervaporspace.2.Abnormal'onditionshavebeenexperiencedwiththepressurizerlevelandpressurecontrolsystems3.Pressurizersprayis-ineffectiveinreducingthepressurizerpressure.March,1981Revision0Page1 4.Planteventshaveoccurred(suchasinadvertentgasaddition,accumulatortankdischarge,coreuncovery,etc.)thatmayresultinnon-condensiblegasesbeingcollectedinthepressurizer.5.AnRCSdepressurizationisrequired.byanotheroperatinginstructionandpressurizersprayis~notavailableand/ortheuseofthepoweroperatedrelief~valvesisnotdesirable.6.Thereactorvesselheadhasbeenvented,ifrequired,priortoventingthepressurizer.,C.IMMEDIATEACTIONSNoneKttE'PiNOTE:Ifthepressurizerisbeingventedbecauselargequantitiesofnon-condensiblegasesarepreventingadepressurization,thentheactionsofstepsmarkedbyanasteriskarenotapplicable.1.TerminateanychangestothereactorcoolantsystemthatmaybeinprogressandbringtheRCStoas-closetoasteady-statecondition.aspossible.*2.Ifnotalreadyperformed,samplethepressurizervaporspaceforthepresenceofnon-condensiblegases.Ifasignficantquantityofnon-condensiblegasesisnotfound,thenreturntotheappropriateoperatinginstruction.March,1981Revision0Page2

!.'1 l~g~3.Inpreparationforventing;isolatethecontainmentpurgeandexhaustsystemsandthepressurevacuumrelieflineandstartallavailablecontainmentaircirculationequipment4.IncreasetheRCSsub-coolingto(insertplantspecificvaluewnichis50'Fabovethevaluewhichisthesumoftheerrorsforthetemperaturemeasurementsystemused,andforthepressuremeasurementsystemtranslatedintotemperatureusingthesat-urationtables)byeitherinitiatinganRCSpressurizationorbydumpingsteamfromthenon-faultedsteamgenerators.NOTE:IfthepressurizerisbeingventedforthepurposeofinitiatingRHRoperationandtheRCStemperatureislessthan350'F,thenadditionalsub-coolingmarginisnotrequired.5.PerformtheactionsofAppendixAtodeterminethemaximumallowabletimeperiodorventing.6.Ifno+alreadyperformed,manuallyblockthelowpressureSI-initiationifthepermissiveisenergized.CAUTION:-TheventingoperationmayresultinpressuredecreasingbelowtheSIsetpoint.ActionshouldbetakentomanuallyblocktheautomaticSIsignalwhenthepermissiveisenergized.*7.Increasechargingflowtomaximumtolimitthedepressurizationrateduringtheventingperiod.Pressurizerlevelwilltrendupwardduringtheventingoperation.March,1981Revision0Page3 0IE 8.Opentheventisolationvalvesinonepressurizerventflowpath.NOTE'foneorbothvalvesfailtoopen,closebothvalvesandopentheisolationvalvesintheparallelflowpath.9.Closebothventisolationvalveswhen:a)ThetimeperioddeterminedinStep5ismet,OR*b)Pressurizerpressuredecreasesby200psi,ORc)Pressurizerlevelincreasesabove80ofspan,ORd)Reactorcoolantsub-coolingdeerasesbelow(insertplantspecificvalvewhichisthesumoftheerrorsforthetemperaturemeasurementsystemused,andforthepressuremeasurementsystemtranslatedintotemperatureusingthe'aturationtables).I10.Re-establishnormalchargingflowandrestorethepressurizerwaterleveltothenormaloperatingrange.ll.Iftheventingwasterminatedpriortoremovingenoughofthenon-condensiblegasestorestorenormalpressurizercontrolortoreducepressuretotherequiredcondition,thenreturntoStep4.NOTE:Ifmultipleventingoperationsarerequiredandthecontainmenthydrogenconcentrationisequaltoorgreaterthan3volumepercent,theprovisionsmustbemadetoMarch,1981Revision0Page4 5BESSURIZERFl&IJRE2I'ateJa/a%iDONALDC.COO<NUCLEARrLANTuNITNOS.1AND.Z

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