ML17244A863

Forwards 30-day Response to IE Bulletin 79-17.No Leaks Found in safety-related Stainless Steel Piping Sys

ML17244A863
Person / Time
Site:	Ginna
Issue date:	08/24/1979
From:	WHITE L D ROCHESTER GAS & ELECTRIC CORP.
To:	GRIER B H NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
NUDOCS 7910030590
Download: ML17244A863 (12)

Text

ROCHESTERGASANDELECTRICCORPORATION0z-::89EASTAVENUE,ROCHESTER,N.Y.I4649LEOND.WHITE.JR.VICEPIISSIDCHTtSI.SPECIEASSACOCCtla546-2700August24,1979Mr.BoyceH.Grier,DirectorU.S.NuclearRegulatoryCommissionOfficeofInspectionandEnforcementRegionI631ParkAvenueKingofPrussia,PA19406

Subject:

I8EBulletin79-17Thirty(30)DayResponseR.E.GinnaNuclearPowerPlant,Unit1DocketNo.50-244

DearMr.Grier:

InaccordancewiththerequirementsofI6EBulletin79-17,wehavepreparedathirty(30)dayresponseonthestagnantboratedwatersystemsatR.E.GinnaNuclearPowerPlant,Unit.1.Stagnantportionsofsystemsthatareaccessibleduringnormalreactoroperation,wheresurfaceandvolumetricexaminationshavenotbeenpreviouslyperformed,shallbeexaminedwithinthenextsixty(60)daysinaccordancewiththerequirementsofItem2oftheBulletin.Ifyouhaveanyfurtherquestionsdonothesitateincontactingus~Verytrulyyours,IIL.D.Whie,Jr.AEC:dmaF4xc:DirectorDivisionofOperatingReactorsU.S.NuclearRegulatoryCommissionOfficeofInspectionandEnforcementWashington,D.C.20555 ll R.E.GinnaNuclearPowerPlant,Unit1DocketNo.50-244Thirty(30)DayResponsetoI6EBulletin79-17PipeCracksinStagnantBoratedWaterSystemsatPWRPlantAugust24,19791.ThefollowingsafetyrelatedstainlesssteelpipingsystemsasdelineatedbytheRochesterGas&ElectricCorporationQualityAssuranceManualcontainstagnantoxygenatedboratedwater.a.SafetyInjectionSystem-ThisincludestheSafetyIn-jection(SI)PumpsuctionfromtheBoricAcidStorageTanksandtheSIPumpsdischargefromvalves888A&Band871AGBtotheReactorCoolantSystemLoopsAGBHot,andColdLegs.b.ContainmentSpraySystem-ThisincludestheContainmentSprayPumpsdischargefromvalves868AGBtothespraypipinginsidecontainmentattheelevationoftheCharcoalDousingSystemcheckvalves.c~ResidualHeatRemovalSystem-ThisincludestheResidualHeatRemovalPumpssuctionfromtheReactorCoolantSystemLoopAHotLegandContainmentSumpBandtheRHRpumpsdischargeaftertheRHRHeatExchangerstothesuctionoftheSIPumps,fromPenetrationP-111totheReactorCoolantSystemLoopBColdLegandtheSafetyInjectionNozzlesontheReactorVessel.AlsofromthedischargepipingarebranchconnectionsfortheResidualHeatRe-movalsampleandtotheLetdownsystem.d.Chemical6VolumeControlSystem-ThisincludestheportionofthissystemwhichprovideflowpathsforboricacidfromtheBoricAcidStorageTankstotheChargingPumpsuctionthroughvalvesV-350andV-356.e.RefuelingWaterCirculatingSystem-ThisincludespipingfromtheLetdownSystemtovalvesV-820andV-821.f.ReactorCoolantSystem-ThisincludesonlythePressurizerCodeSafetyValveloopseals.1a.Systempressuretests(hydro)andvisualexaminationsinaccordancewiththeASMEBGPVCode1974EditionSectionXIArticleIWA-5000havebeenperformedforallsystemsidenti-fiedabove.Thefollowingisalistingofthesesystemsandthedateofthetests.a.SafetyInjectionSystem:*SuctionpipingDischargepiping5/13/775/6/77Page1of5

b.ContainmentSpraySystem:Suctionpiping(includingNaOH)Dischargepipingc.ResidualHeatRemoval:*SuctionpipingDischargepiping(includingsamplepiping)Tie-intotheLetdownSystemd.Chemical6VolumeControlSystem:ImmediateboratepathsV-350andV-356e.RefuelingWaterCirculatingSystem:Suction(letdowntoV-820)Discharge(V-821toletdown)5/13/775/16/773/5/793/5/795/7/773/18'/765/7/775/7/77f.ReactorCoolantSystem:PressurizerSafetyValveLoopSeals4/29/78*NOTE-ThoseportionsofthesesystemswhichtieintotheReactorCoolantSystem(RCS)wereisolatedfromtheRCSduringtheirhydrotest.TheremainingpipingtotheRCSwashydrotestedduringtheRCShydroteston4/29/78.InaccordancewiththeInserviceInspectionProgramfoundinRochesterGasandElectric'sQualityAssuranceManual,AppendixB,whichmeetstherequirementsof10CFR50.55a(g),surfaceandvolumetricexaminationshavebeenperformedontheSafetyIn-jectionSystem,ResidualHeatRemovalSystemandthePressurizerSafetyValveloopseals.SurfaceandvolumetricexaminationsarenotperformedontheContainmentSpraySystem,ChemicalandVolumeControlSystems,theRefuelingWaterCirculatingSystemandportionsoftheSafetyInjectionSystemforthefollowingreasons:a.ContainmentSpraySystems-ThisportionofthesystemareexemptedcomponentsasallowedbytheASMEBGPVCode1974EditionSectionXIArticlesIWC-1220.b.Chemical6VolumeControlSystem-TheportionsofthissystemareexemptedcomponentsasallowedbytheASMEB&PVCode1974EditionSectionXIArticlesIWC-1220andarenotwithinthescopeofArticleIWD-2600.c.RefuelingWaterCirculatingSystem-TheportionsofthissystemarenotwithinthescopeoftheASMEBGPVCode1974EditionSectionXIArticleIWD-2600.Page2of5

d.SafetyInjectionSystem-Theportionsincludethe3"and4"dischargepipingwhichareexemptedcomponentsbytheASMEBGPVCode1974EditionSectionXIArticleIWC-1220.Thefollowingisasummaryofinserviceinspection,visual,surfaceandvolumetricexaminationsperformedontheSafetyInjectionSystem,ResidualHeatRemovalSystemandthePressurizerSafetyValveLoopSealswithinthe10yearperiodfrom1970to1979.Theseexami-nationshavebeencategorizedbylowpressure/highpressure(suction/discharge)andbypipesize..a.SafetyInjectionLowPressure:8II10"HighPressure:2IIVisual20welds'1weld13weldsSurfaceandVolumetric65RT's,85weldsUT's9welds1weldb.ResidualHeatRemoval:LowPressure:6II8li10"HighPressure:41I6Tl8II10"Visual01weld14welds04welds1weld3weldsSurfaceandVolumetric2welds3welds28welds2welds15welds11welds12weldsc~SafetyLine4IIPressurizerSafetyValveLoopSeals:SurfaceandVisualVolumetric3welds.5weldsTheseinserviceexaminationswereconductedinaccordancewiththeASMEBoilerandPressureVesselCodeJuly1,1974,EditionsofSectionsVandXIthroughtheSummer1975Addenda.Thiswouldincludetheprocedurequalificationrequirementsandacceptancecriteria.However,onOctober8,1976aleakwasdetectedinasectionof8"Schedule10stainlesssteelpipeasreportedinLER76-24onOctober11,1976.Thisleakresultedinultrasonicexaminationbeingperformedon75weldsintheaffectedsystem.Theproceduresandtechniquesusedwerequalifiedandverifiedoncrackedpipingwhich'hadbeenremovedfromserviceandutilizedasatestmock-up.Severalotherweldsinrelatedsystemswerealsoexaminedwithnofurtherproblemsfound.Correctiveactiononthecracksfoundbothfromleakageandultra-sonicexaminationswerelistedinLER76-24onOctober11,1976andsupplementedreportsonOctober22,1979,December21,1976,February10,1977andJune8,1977.Page3of5

~~1b.Certainportionsofthosesystemidentifiedaboveareinter-mittentlystagnantandarerecirculatedonamonthlybasisorhaveflowoccuringonaquarterlybasiswithwaterfromtheRefuelingWaterStorageTank.Thesesystemsareasfollows:a.SafetyXnjectionSystem-ThisincludesthesuctionfromtheRefuelingWaterStorageTankthroughtheSlPumpstotheRefuelingWaterStorageTank,whichisrecirculatedonamonthlybasis.b.ContainmentSpraySystem-Thisincludesthesuctionfrom'heRefuelingWaterStorageTankthroughtheCSPumpstotheRefuelingWaterStorageTank,whichisrecirculatedonamonthlybasis.c.ResidualHeatRemovalSystem-ThisincludesthesuctionfromtheRefuelingWaterStorageTankthroughtheRHRPumpsandRHRHeatExchangerstotheRefuelingWaterStorageTank,whichisrecirculatedonamonthlybasis.d.Chemical8VolumeControlSystem-ThisincludesthepipingfromtheRefuelingWaterStorageTankthroughvalveAOV-112BtothesuctionogtheChargingPumps.whichreceivesflowduringthequarterlytestingofAOV-112B.ChemistrycontrolsfortheRefuelingWaterStorageTankandtheBoricAcidStorageTanksfollows:a.RefuelingWaterStorageTank(RWST):ThechemistryoftheRWSTiscontrolledbyuseofthespentfuelpitdemineralizer.PriortoandaftereachrefuelingtheRWSTisnormallyrecirculatedtobringtheCl6Fwithinspecification.TheWestinghousespecifi-cationswere0.5ppmC1and0.15ppmF.Thenewlimitsare0.15ppmforbothClSF.WehavenormallybeenwithinlimitsforFbutoccasionallythe0.5ppmlimitforchloridehasbeenexceeded.OxygenintheRWSTisnotsampledandtherearenoconcentrationrequirements.TheRWSTisopentoatmosphereandthereforewillabsorboxygen,soaconcentrationspecificationismeaningless.Boronismaintainedbetween2000-3000ppmandsampledmonthly.b.BoricAcidStorageTanks:Chloride,Flouride,OxygenandpHarenotnormallysampledforonthestoragetanks.Theonlycontrolfortheseimpuritiesisbydemineralizationofallprocessedboricacid(mixedbedandcationD.Z.'s).Boronconcentrationischeckedthreetimesperweek.Modificationspreviouslycompletedtoincreaserecirculationofthesetankshas.beenforwardedtotheNRCunderLER76-24.Referenceitem1dofthisbulletinresponse.'age4of5

~A 1c.Preservicenondestructiveexaminationsperformedontheweldjointsofthesepipingsystemswasvolumetricutilizingradiographicexaminations.Theseexaminationswereper-formedbytheM.W.KelloggCo.duringspoolpieceshopfabricationandbyPittsburghTestingLaboratoriesduringfieldinstallation.AllradiographywasperformedinaccordancewiththeAmericanNationalStandardCodeforPressurePipingANSIB-31.1.1d.RochesterGasandElectricCorporationreportedtotheUSNRConOctober8,1976byLicenseeEventReport76-24,informationregardingcracksintheSafetyInjectionPipingbetweentheBoricAcidStorageTanksandandtheSafetyInjectionPump.SupplementalreportswereforwardedtotheNRCon11/11/76,11/22/76,2/10/77and6/8/77regardingLER76-24.Alsoon12/21/76,RGGEprovidedtheNRCwithresponsetoI&ECircular76-06.AllcorrectiveactionsperformedasaresultofLER76-24andIGECircular76-06areincludedinthesecorre-spondences.Page5of5 I0III'g~~