ML18025A495

Susquehanna Units 1 and 2 - Letter Responding to the April 17, 1975 Letter Requesting Additional Information Relative to the Design of the Containment for SSES and Attaching the Mark Ii Containment Program and Schedule

ML18025A495
Person / Time
Site:	Susquehanna
Issue date:	06/05/1975
From:	Curtis N W Pennsylvania Power & Light Co
To:	Butler W R Office of Nuclear Reactor Regulation
References
Download: ML18025A495 (4)

Text

.NRCDISTRIBUTIONFORPART50DOCKETMATERIALi(TEMPORARYFORM)'MTrFILErrFROM.PennsylvaniaPer5LightAllentown,EhNWCurtisTO:Mr.WAButlerDATEOF.DOC6-5-75-ORIG1signedDATE.REC'D6=9-75CCOTHERLTRXXTWXRPTSENTtRCPDRSENTLOCALPDROTHERCLASSUNCLASSKQGKPROPINFOINPUTNOCYSREC'D.DOCKETNO:50-'388DESCRIPTION:Ltrwithattachmentreourlettersof4-17-75,end4-2Q-75~providesadd.infowithregardstotheLDCArelatedsuppressionpoolhydrodynamicphenomena...ENCLOSURES:PLANTNAME:Susquehana152FORACTION/INFORMATION~BUTLER(L)W/copies'LA'RK(L)Ml/Copi/s,PARR(L)Ml/CopiesKNIEL(L)'W/CopiesSCHWENCER(L)W/CopiesSTOLZ(L)W/CopiesVASSALLO(L)Ml/Copies.PURPLE(L)'/CopiesZIEMANN(L)Ml/CopiesDICKER(E)VI//CopiesKNIGHTON(E)W/CopiesYOUNGBLOOD(E)W/CopiesREGAN(E)W/CopiesLEAR(L)Ml/'opies.SPIESMl/CopiesLPHMl/opiesEGFILETECHRFVIEW~ASCHRQEDER'C,ROODP-506AMACCARYg~OSSICK/STAFFKNIGHTHASEPAWLICKIigCIAMBUSSOSHAQ~B('.~YD~STELI.OMO)ORE(L)HOUSTON~DFYOUNG(L)~OVAKQ)SKOVHOLT(L)~ROSSGQI.LER(L)(Ltr)IPPOLITOP.COLLINS~TEDESCODENilSELONGRF.GOPRQ.)LAINASFILEaiREGION(2)BENAROYAkiIPCVOLLMiERrINTERNALDISTRIBUTIONLICASSTDIGGS(L)GEARIN(L)GOULBQURNE(I)KREUTZER(E)LEE(L)MAIGRET(L)REED(E)SERVICE(L}SHEPPARD(L)SLATER(E)Sill1TH(L)TEETS(L)WlLLIASS(E)WILSON(L}INGRAM(L)DUNCANDENTONGRIMESR.GAMiMILLH.KASTNERE.BALLARDP.SPANGLERJ.~M.ENVIRO~S.MULLERM.DICKERS.KNIGHTONM.YOUNGBLOODH.REGANSiPROJECTLDRG./~]959'.HARLESSR.~H.EXlERNALDISTI-ilBUTIONA/TIND.BRAITT6ANSALTZMANMELTZPLAiIIS.~CDONALDCHAPiMANDUBE{Ltr'}~E.COUPEPETERSONHARTFIELD(2)'LECKER1LOCALPDRWi13sesBarre,~+~-TIC.{ABERNATHY)(1)(2)(10)-NATIONALLABS+-NSIC(BUCHANAN)1-W..PENNINGTQN,RmE-201GT1-ASLB1-CONSULTANTS1-NewtonAndersonNEWMARK/8LUME/AGGABIAN~jfACREI~XB-IRK/SENT.roASiG)E.T.u)1-PDR-SAN/LA/NY1-BRQQKHAVENNATLAB1-G.ULRIKSON0RNL 1TWONORTHNINTHSTREET,ALLENTOWN,PA.18101June5,1975Dr.h'alterR.Butler,ChiefLightllaterReactorsBranch1-2DivisionofReactorLicensingU.S.NuclearRegulatoryCommissionwashington,D.C.20555SUSQUEHANNASESADDITIONALINFORMATION-CONTAINKNTDESIGNER100450FILES840-2,170PLA-69

DearDr.Butler:

R'BPIlÃAflff)nl!IPft-I[a;.".'-.'eLQtlgg"-.-Jgye)ci)IDocketNos.50-387Ic)50-388ggUNISlitnil)Aj)C~I]I,oilS'idioItW4igYourletterofApril17,1975indicatedthattheNRCrequiresadditionalinformationrelativetothedesignofthecontainmentfortheSusquehannaSteamElectricStation,Units1and2.Yourequestedthatwesubmittoyouwithinthirtydaysourprogramandscheduleforpromptresolutionofthepotentialproblem'sassociatedwiththeLOCArelatedsuppressionpoolhydro-dynamicphenomenaidentifiedbyGeneralElectricduringMarkIIItesting.YourletterofApril23,1975requestedadditionalinformationrelatedtotheeffectsofmainsteamreliefvalveoperation.Yourequestedthatwerespondwithin90daysorthatweadviseyouwithin15daysif>>ecannotmeetthisschedule.Subsequently,weinformedyouthat>>ewouldsubmitourproposedprogramandscheduleforresolvingtheseissuestheweekofJune2,1975.Sincetheinvestigationsofthephenomenadiscussedinyourlettersareinterr'elated,wehavechosentorespondtobothsubjectstogether.Priortoreceiptofyourletters,>>ehadbegunaprogramtoevaluatecer-tainsuppressionpoolphenomena.Thesephenomena,asidentifiedinourApril4,1975lettertoMr.J.P.O'Rei'lly,are:1.SuppressionPoolSwell2.ContainmentVentPipeHorizontalLoadsfromSteamCondensation.3.MainSteamSafety/ReliefValvedischargepipeairclearing.PENNSYLVANIAPOWERILLIGHTCOMPANY Page-2Theprogramtoinvestigatethesethreephenomena,andtheotherphenomenamentionedinyourletter,isdescribedintheattachmentandreflectsourlong-termapproachtoresolutionoftheseproblems.TheprogramandscheduleweredevelopedinconjunctionwithGeneralElectricbytheutilitiesowningplantswithMarkIIcontainments.Aspartofourneartermeffortstopermitrestartofcontainmentconstruction,wehavedoneasubstantialamountofworkintermsofdefiningboundingloads,basedoninformationsuppliedbyGeneralElectric,anddeterminingthecapa-bilityoftheexistingstructures.Basedonthiswork,wehaveconcludedthatsomeofthe"holds"placedoncontainmentconstructionactivitiescanbelifted.NehavescheduledameetingforJune17>>iththeNRCtodiscusstheboundingloads,methodsofstructuralanalysisusedtodeterminestructuralcapability,andourplansfortheresumptionofcontainmentconstruction.Verytrulyyours,N.N.CurtisVicePresident-Engineering5ConstructionCTC:NBc-Messrs.Mr.J.P.O'Reilly-USNuc.Reg.Com.Director-RegionIU.S,NuclearRegulatoryCommission951ParkAvenueKingofPrussia,PA19406 i~lARKllCUBI'A1NHLNTPROGRAMPgSCIIEDULE~ProramSubmitsuppressionpoolandreliefvalvedrawingsreflectingcurrentdesign.ScheduleJuly,1975LOCAguestions**SRVuestns**5*2.3.Submitageneric"ForcingFunctionReport"whichwillprovidethotimehistoryofpooldynamicforcingfunctionsandthemethodsforrelatingthesefunctionstothecontainmentstructuresandcomponents.Submitadescriptionofsuppressionpooltemperaturemonitoringsystem.(TemperaturelimitsandtransientswillbedescribedintheFinalSafetyAnalysisReport.)Sept.,1975Oct.,19752,7*NotAppl.1*24*/7,8,9,IOS.SubmitapreliminaryassessmentofcontainmentstructuresandcomponentsbasedontheForcingFunctionReport.Nov.,197S3,4,5,6,7*,83,4*,5S.Submitascheduleforthegenerictestprogramandmathematicalmodelswhichjustifytheforcingfunctionsusedtoassesscontainmentstructuresandcom-ponents.Dec.,19756.Submitascheduleforthefinalassess-mentofcontainmentstructuresandcomponents.FirstQuarter1976*PartialAnswerQuestionNumberscorrespondtotheadditionalinformationrequestscontainedinNRClettersdatedApril17andApril23,197S.