ML17037B534

Nine Mile Point Unit 1 - Letter Regarding NRC Staff Review of Addendum 3 to the Mark I Containment Evaluation Short Term Program Report Which Was Submitted on 08/17/1976 by GE Company on Behalf of the Mark I Owner'S Group

ML17037B534
Person / Time
Site:	Nine Mile Point
Issue date:	09/14/1976
From:	Lear G Office of Nuclear Reactor Regulation
To:	Rhode G K Niagara Mohawk Power Corp
References
Download: ML17037B534 (8)

Text

r,'SEP14576DocketNo.50-220-NiagaraMohawkPowerCorporation ATTN:Mr.GeraldK.RhodeVicePresident

-Engineering 300ErieBoulevard 1/estSyracuse, HewYork13202Gentlemen:

Dis&rbution NRCPDRLocalPDRORBk3FileKGollerTJCarterOELDOI8E(5)GLearJGuibertCParrishDEisenhut TBAbernathy JRBuchanan

'ACRS(16)DRossTheNRCstaffhascompleted itsreviewofAddendum3totheHarkIContainment Evaluation ShortTermProgramReport(NEDC-20989-P) whichwassubmitted totheNRConAugust17,1976byGeneralElectricCompanyonbehalfoftheMarkIOwner'sGroup.TheAddendum3reportdescribes themethodsusedtodetermine theventheaderandventpipepoolswellimpactloadswhichwereconsidered inthe"PlantUniqueAnalysisReportForTorusSupportSystemandAttachedPipingForNineMilePointNuclearPowerStation"datedJuly26,1976.'lfehaveconcluded thatthemethodsusedtodetermine plantuniquepoolswellvelocities fromthereference plantvelocity, asdescribed inAddendum3,are,acceptable; however,wehavefurtherconcluded thatthedetermination ofvent-header andventpipeimpactloadsusingimpulse/velocitydataobtainedfrom1/12scaletestfacilitystraingagemeasure-mentsisnotacceptable sincewebelievethesestraingagemeasurements domotprovideanadequatearidreliabledatabase.Consequently, werequirethatyouprovideasupplement totheNineMilePointUnitNo.1plantuniqueanalysisreportwhichconsiders ventheaderandventpipeimpactloadswhichhavebeendetermined usingtheimpulse/velocity relationship derivedfromtheMarkIII-PressureSuppression TextFacility(PSTF)data.Inorderforus'ocompleteourreviewoftheMarkIContainment ShortTerm-Program inatimelymanner,werequirethatyouprovideyourwrittenresponse'.,'y Octoberl.1976.Onesignedoriginaland39copiesofyourresponsewillbenecessary.

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'PRINTINO OPXICKIIOT4424!44 H~W",We)1ff!4~'uukkIJ\rI~1~4I)1'r~~334IIIIt,)lIkrr~r1!'44It4It4~rk4!1I~,W'4II4 NiagaraMohawkPowerCorporation SEPj.<816'IIfyouhaveanyquestions regarding therequested information, wewouldbepleasedtomeetwithyou.lSincerely, OriginalsignedbyGeorgeLear,Chief'perating ReactorsBranch83DivisionofOperating Reactorscc:ArvinE.Upton,EsquireLeBoeuf,Lamb,Leiby8MacRae1757NStreet,-N.W,Washington, D.C.20036AnthonyZ.Roisman,EsquireRoisman,KesslerandCashdan1712NStreet,N.W.Washington, D.C.20036OswegoCityLibrary120E.SecondStreetOswego,NewYork131260843CPa'sh9//OPPICE~SURNAME~DATE~PofsehEC-318(Rev.9.$3)CM0240.....O.RB:

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Niagarat5ohawkPowerCorporation ATTN:ter.GeraldK.RhodeVicePresident

-Engineering 300ErieBoulevard WestSyracuse, HewYork13202InaJune18,1976letterfromter.E.A.Ilughes,GeneralElectricCompany(GE),toftr.V.StellooftheNRCstaff,GE!providedresponses onbehalfoftheHarkIOwner'sGrouptoNRCstaffquestions ontheMarkIContainment Evaluation ShortTermProgramfinalreport.TheresponsetoContainment SystemsBranch(CSB)guestionNo.9providedinformation regarding potential damagetocriticaltorusinternalstructures andcomponents frommissilesgenerated asaresultofpost-LOCApoolswellimpactloadsonthesolidcatwaTk,insidethef<inetiilePointUnitNo.1(t<HP-1)suppression pool(torus).InyourletterofJuly23,1976youstatedthat,althoughcontainment integrity wouldbemaintained forthemostprobablemissileimpactorientations andtargetareas,NtlPCwouldremovethesolidcatwalkatNt<P-1andreplaceitwithagratingcatwalkduringthescheduled Spring1977refueling outageinordertoalleviate thepotential fordamage.Inordertocompleteourreviewandevaluation ofthecontinued useofasolidcatwalkatHtlP-1untilSpring1977,theHRCstaffrequiresthatyouprovideastudywhichdetermines theprobability oflossofcontain-mentintegrity atHMP-1duetoapostulated LOCAandsubsequent catwalkmissiledamage.Thestudyshouldconsidertheprobability ofapipebreakresulting inaLOCAwhichinturnresultsinthefailureofthesolidcatwalk.Itshouldalsoconsidertheorientations ofthecatwalkmissileswhichresultinfailureofthetoruswall,ventpipeandbellowsassembly.

Sincemuchofthecatwalkmayfail.thestudyshouldincludetheeffectsofmultiplemissiles.

InordertocompleteourreviewoftheMarkIContainttletft ShortTermProgi.aminatimelyfashion,werequirethattheabovementi edinformation beprovidedbyOctober1,1976.Onesignedoriginalandopiesofyourresponsewillbenecessary.

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4Niagaraf<ohawkPowerCorporation SEP14$76Ifyouhaveanyquestions regarding therequested information, wewouldbepleasedtomeetwithyou.Sincerely, Origina(signgi,yGeorgeLear,ChiefOperating ReactorsBranch83DivisionofOperating Reactorscc:ArvinE.Upton,EsquireLeBoeuf,Lamb,Leiby5HacRae1757NStreet,H.W..Washington, D.C.20036AnthonyZ.Roisman,'squire Roisman,KesslerandCashdan1712NStreet,N.W.Washington, D.C.,20036OswegoCityLibrary120E.SecondStreetOswego,NewYork13126RB83......CRa

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