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{{#Wiki_filter:8REGOg~oCyAO+~O~+*+<<IUNITEDSTATESNUCLEARREGULATORYCOMMlsslONWASHINGTON,D.C.20555February28,1978AllOperatingBWRLicensees(ExceptforHumboldt)Gentlemen:TheNRCstaffhascompleteditsreviewofthegenericMarkIContainmentShortTermProgramconductedbytheMarkIOwnersGroup'ndtheassociatedplant-uniqueinformationwhichyouprovidedwithrespecttoyourfacility'scontainmentsystem.Theresultsofourreviewaredocumentedinthestaff's"MarkIContainmentShortTermProgramSafetyEvaluationReport,"NUREG-0408,December1977.Acopy.ofthisdocumentisenclosedforyourinformation.Baseduponourreview,wehaveconcludedthatlicensedMarkIBWRfacilitiescancontinuetooperatesafely,withoutunduerisktothehealthandsafetyofthepublic,duringaninterimperiodofapproximatelytwoyearswhileamethodical,comprehensiveLonqTermProgram(LTP)isconducted.Thisconclu-sionhasbeenmadebasedonourdetermination(1)thatthemagnitudeandcharacterofeachofthehydrodynamicloadsresultingfromapostulatedde-signbasislossofcoolantaccident(LOCA)havebeenadequatelydefinedforuseintheShortTermProgram(STP)structuralassessmentoftheMarkIcontainmentsystem;and(2)that,forthemostprobableloadsinducedbyapostulateddesignbasisLOCA,asafetyfactortofailureofatleasttwoexistsfortheweakeststructuralormechanicalcomponentinthecontain-mentsystemforeachoperatingMarkIBWRfacility.AsdescribedinSectionIVofNUREG-0408,ourevaluationofthecapabilityofyourfaci'lity'sMarkIcontainmentsystemtowithstandtherecentlyidentified'OCA-relatedhydrodynamicsuppressionpoolloadsindicatesthat,althougheachofthestructuralandmechanicalcomponentsofyourcontain-mentsystemmeettheSTPstructuralacceptancecriteria(i.e.,asafetyfactortofailureofatleasttwo),thedemonstratedsafetymarginsofcertaincomponentsundertheseloadingconditionsislessthan.thatwhichisnecessarytosatisfytherequirementsofSectionIIIoftheASMEBoilerandPressureVesselCode.Consequently,wehaveconcludedthatthe | |||
demonstratedsafetymarginofyourfacility'scontainmentsystemwithrespecttosuchloadingconditionsdoesnotcomplywithourcurrentinterpretationof"sufficientmargin"asprescribedinGeneralDesignCriterion(GDC)50,"ContainmentDesignBasis",ofAppendixAto10CFRPart50.Forlongtermoperationofyourfacility,wewillrequirethatthestructuralandmechanicalcomponents-ofyourfacility'scon-tainmentsystemmeettheacceptancecriteriaoftheASMEBoilerandPressureVesselCodetothemaximumextentpracticablefortheloadsandloadingcombinationsidentifiegjntheMarkIContainmentLongTermProgramandapprovedbytheNRCstaff.However,wefindthat:(1)yourfacility'scontainmentsystemdesignstillretainssufficientmarginunderpresentconditionstoprecludefailureandthusprovidesreasonableassuranceofnounduerisktothehealthandsafetyofthepublic,(2)theobjectiveoftheHarkICon-tainmentLTP,i.e.,torestoretheoriginallyintendeddesignsafetymarginsforeachHarkIcontainmentsystem,isacceptable,and(3)theHarkIOwner'sProgramActionPlanfortheLTPisreasonablydesignedtosatisfytheLTPobjectives.Therefore,wefindthatoperationofyourfacility,inconformancewiththeconditionsspecifiedinNUREG-0408,willnotendangerlifeorpropertyorthecommondefenseandsecurity.IntheabsenceofanysafetyproblemassociatedwithoperationofyourfacilityuntiltheLTPiscompleted,thereappearstobenopublicinterestconsiderationfavoringrestrictionoftheoperationofyourfacility.Accordingly,pursuantto10CFRPart50,Section50.12,you'rehereby.grantedanexemptionfromGDC-50,withrespecttoLOCA-relatedhydrodynamicsuppressionpoolloads,foraninterimperioduntilcompletionoftheLTP(approximatelytwoyears),providedthattheconditionsspecifiedinNUREG-0408andanyresultingTechnicalSpecificationrequirementsaremaintained.Tothisextent,thisexemp-tionencompassesanyrelatedrequirementsof10CFRPart50,Section50.55(a),andGDC-l.AsampleFEDERALREGISTERNoticerelatedtothisactionisalsoenclosedTheNoticethatisfiledwiththeOfficeoftheFederalRegisterforeachindividualplantwillbeprovidedatalaterdate.AsdiscussedinSectionIII.C.ofNUREG-0408,operatingandsurveillancerequirementsondrywe11/wetwelldiffere'ntialpressureandtoruswaterlevelswillbeincorporated,bylicenseamendment,intoyourfacilityTechnicalSpecificationsinthenearfuture | |||
==Enclosures:== | |||
SeePage3VorStell,Jr.,rectorDivisionopenReactorsOfficeofNuclearReactorRegulation | |||
==Enclosures:== | |||
l.NUREG-0408,"NarkIContainmentShortTermProgramSafetyEvaluationReport"2.FederalReisterNotice | |||
+C SAMPLEFEDERALREGISTERNOTICEUNITEDSTATESNUCLEARREGULATORYCOMMISSIONDOCKETNO.LICENSEENOTICEOFGRANTINGANEXEMPTIONFROMTHEREUIREMENTSOFENERALDESIGNCRIER050CONTAINMENTDESIGNBASISOFAPPENDIATO1CFRPART5TheU.S.Nuclear.RegulatoryCommission(TheCommission)hasgrantedanexemptionfromtherequirementsofGeneralDesiqnCriterion50,"Contain-mentDesignBasis",ofAppendixAto10CFRPart50to(Licensee)(theLicensee).ThisexemptionrelatestothedemonstratedsafetymarginoftheMarkIcontainmentsystemfor(FacilitName)forrecentlyidentifiedhydrodynamicsupppressionpoolloadsassociatedwithapostulateddesignbasislossofcoolantacci.dentandprovidesforoperationundertheconditionsspecifiedintheNRCstaff's"MarkICon-tainmentShortTermProgramSafetyEvaluationReport"andunderanyresultingTechnicalSpecificationrequirements.Tothisextent,thisexemptionencompassesanyrelatedrequirementsof10CFRPart50,Sec-tion50.55(a),andGeneralDesignCriterion1.Thisexemptioniseffectiveasofthedateofitsissuance.TheCommissionhasevaluatedthedemonstratedsafetymarginofthecontainmentsystemfor(FacilitName)underpresent | |||
conditionsandhasconcludedthatsufficientmarginexiststoprecludeunduerisktothehealthandsafetyofthepublic.Thisevalua-tionisdocumentedinthestaff's"HarkIContainmentShortTermProgram.SafetyEvaluationReport,"NUREG-0408,Pecember1977.Thisexemptionisgrantedforaninterimperiodofapproximatelytwoyearswhileamoredetailedreviewi'sconducted.Attheconclusionofthisre-view,thedesignsafetymarginofthecontainmentsystemfor(FacilitNamewillberestoredtothatwhichwasoriginallyintendedatthetime(FacilitName)waslicensedforoperation.Thebasisforthisexemptionissetforthinthelettertothelicenseegrantingtheexemption,datedFebruary,1978.TheCommissionhasdeterminedthatthegrantingofthisexemptionwillnotresultinanysignificantenvironmentalimpactandthatpursuantto10CFRSection51.5(d)(4)anenvironmentalimpactstatementornegativedeclara-tionandenvironmentalimpactappraisalneednotbepreparedinconnectionwiththisaction.Forfurtherdetailswithrespecttothisaction,see(1)theCommission'slettertothelicenseedatedFebruary,1978,and(2)theCommission' | |||
)~H,~"1IllII "MarkIContainmentShortTermProgramSafetyEvaluationReport,"NUREG-0408,December1977.TheseitemsareavailableforpublicinspectionattheCommission'sPublicDocumentRoom,1717HStreet,N.W.,Washington,D.C.andatthe(LPDR)Acopyofitem(1)maybeobtaineduponrequestaddressedtotheU.S.NuclearRegulatoryCommission,Washinq-ton,D.C.20555,,Attention:Director,DivisionofOperatingReactors.Acopyofitem(2)maybeobtaineduponrequestaddressedtotheNationalTechnicalInformationService,Sprinqfield,Virginia22161.DatedatBethesda,MarylandthisFORTHENUCLEARREGULATORYCOMMISSION,ChiefOperatinqReactorsBranchDivisionofOperatingReactors Cl NiagaraMohawkPowerCorporationcc:EugeneB.Thomas,Jr.,EsquireLeBoeuf,Lamb,Leiby5MacRae1757NStreet,N.W.Washington,D.C.20036AnthonyZ.RoismanNaturalResourcesDefenseCouncil91715thStreet,N.W.Washington,D.C.20005OswegoCountyOfficeBuilding46E.BridgeStreetOswego,NewYork13126 | |||
}} | }} | ||
Revision as of 11:03, 30 April 2018
| ML17037B598 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 02/28/1978 |
| From: | Stello V Office of Nuclear Reactor Regulation |
| To: | Niagara Mohawk Power Corp |
| References | |
| NUREG-0408 | |
| Download: ML17037B598 (14) | |
Text
8REGOg~oCyAO+~O~+*+<<IUNITEDSTATESNUCLEARREGULATORYCOMMlsslONWASHINGTON,D.C.20555February28,1978AllOperatingBWRLicensees(ExceptforHumboldt)Gentlemen:TheNRCstaffhascompleteditsreviewofthegenericMarkIContainmentShortTermProgramconductedbytheMarkIOwnersGroup'ndtheassociatedplant-uniqueinformationwhichyouprovidedwithrespecttoyourfacility'scontainmentsystem.Theresultsofourreviewaredocumentedinthestaff's"MarkIContainmentShortTermProgramSafetyEvaluationReport,"NUREG-0408,December1977.Acopy.ofthisdocumentisenclosedforyourinformation.Baseduponourreview,wehaveconcludedthatlicensedMarkIBWRfacilitiescancontinuetooperatesafely,withoutunduerisktothehealthandsafetyofthepublic,duringaninterimperiodofapproximatelytwoyearswhileamethodical,comprehensiveLonqTermProgram(LTP)isconducted.Thisconclu-sionhasbeenmadebasedonourdetermination(1)thatthemagnitudeandcharacterofeachofthehydrodynamicloadsresultingfromapostulatedde-signbasislossofcoolantaccident(LOCA)havebeenadequatelydefinedforuseintheShortTermProgram(STP)structuralassessmentoftheMarkIcontainmentsystem;and(2)that,forthemostprobableloadsinducedbyapostulateddesignbasisLOCA,asafetyfactortofailureofatleasttwoexistsfortheweakeststructuralormechanicalcomponentinthecontain-mentsystemforeachoperatingMarkIBWRfacility.AsdescribedinSectionIVofNUREG-0408,ourevaluationofthecapabilityofyourfaci'lity'sMarkIcontainmentsystemtowithstandtherecentlyidentified'OCA-relatedhydrodynamicsuppressionpoolloadsindicatesthat,althougheachofthestructuralandmechanicalcomponentsofyourcontain-mentsystemmeettheSTPstructuralacceptancecriteria(i.e.,asafetyfactortofailureofatleasttwo),thedemonstratedsafetymarginsofcertaincomponentsundertheseloadingconditionsislessthan.thatwhichisnecessarytosatisfytherequirementsofSectionIIIoftheASMEBoilerandPressureVesselCode.Consequently,wehaveconcludedthatthe
demonstratedsafetymarginofyourfacility'scontainmentsystemwithrespecttosuchloadingconditionsdoesnotcomplywithourcurrentinterpretationof"sufficientmargin"asprescribedinGeneralDesignCriterion(GDC)50,"ContainmentDesignBasis",ofAppendixAto10CFRPart50.Forlongtermoperationofyourfacility,wewillrequirethatthestructuralandmechanicalcomponents-ofyourfacility'scon-tainmentsystemmeettheacceptancecriteriaoftheASMEBoilerandPressureVesselCodetothemaximumextentpracticablefortheloadsandloadingcombinationsidentifiegjntheMarkIContainmentLongTermProgramandapprovedbytheNRCstaff.However,wefindthat:(1)yourfacility'scontainmentsystemdesignstillretainssufficientmarginunderpresentconditionstoprecludefailureandthusprovidesreasonableassuranceofnounduerisktothehealthandsafetyofthepublic,(2)theobjectiveoftheHarkICon-tainmentLTP,i.e.,torestoretheoriginallyintendeddesignsafetymarginsforeachHarkIcontainmentsystem,isacceptable,and(3)theHarkIOwner'sProgramActionPlanfortheLTPisreasonablydesignedtosatisfytheLTPobjectives.Therefore,wefindthatoperationofyourfacility,inconformancewiththeconditionsspecifiedinNUREG-0408,willnotendangerlifeorpropertyorthecommondefenseandsecurity.IntheabsenceofanysafetyproblemassociatedwithoperationofyourfacilityuntiltheLTPiscompleted,thereappearstobenopublicinterestconsiderationfavoringrestrictionoftheoperationofyourfacility.Accordingly,pursuantto10CFRPart50,Section50.12,you'rehereby.grantedanexemptionfromGDC-50,withrespecttoLOCA-relatedhydrodynamicsuppressionpoolloads,foraninterimperioduntilcompletionoftheLTP(approximatelytwoyears),providedthattheconditionsspecifiedinNUREG-0408andanyresultingTechnicalSpecificationrequirementsaremaintained.Tothisextent,thisexemp-tionencompassesanyrelatedrequirementsof10CFRPart50,Section50.55(a),andGDC-l.AsampleFEDERALREGISTERNoticerelatedtothisactionisalsoenclosedTheNoticethatisfiledwiththeOfficeoftheFederalRegisterforeachindividualplantwillbeprovidedatalaterdate.AsdiscussedinSectionIII.C.ofNUREG-0408,operatingandsurveillancerequirementsondrywe11/wetwelldiffere'ntialpressureandtoruswaterlevelswillbeincorporated,bylicenseamendment,intoyourfacilityTechnicalSpecificationsinthenearfuture
Enclosures:
SeePage3VorStell,Jr.,rectorDivisionopenReactorsOfficeofNuclearReactorRegulation
Enclosures:
l.NUREG-0408,"NarkIContainmentShortTermProgramSafetyEvaluationReport"2.FederalReisterNotice
+C SAMPLEFEDERALREGISTERNOTICEUNITEDSTATESNUCLEARREGULATORYCOMMISSIONDOCKETNO.LICENSEENOTICEOFGRANTINGANEXEMPTIONFROMTHEREUIREMENTSOFENERALDESIGNCRIER050CONTAINMENTDESIGNBASISOFAPPENDIATO1CFRPART5TheU.S.Nuclear.RegulatoryCommission(TheCommission)hasgrantedanexemptionfromtherequirementsofGeneralDesiqnCriterion50,"Contain-mentDesignBasis",ofAppendixAto10CFRPart50to(Licensee)(theLicensee).ThisexemptionrelatestothedemonstratedsafetymarginoftheMarkIcontainmentsystemfor(FacilitName)forrecentlyidentifiedhydrodynamicsupppressionpoolloadsassociatedwithapostulateddesignbasislossofcoolantacci.dentandprovidesforoperationundertheconditionsspecifiedintheNRCstaff's"MarkICon-tainmentShortTermProgramSafetyEvaluationReport"andunderanyresultingTechnicalSpecificationrequirements.Tothisextent,thisexemptionencompassesanyrelatedrequirementsof10CFRPart50,Sec-tion50.55(a),andGeneralDesignCriterion1.Thisexemptioniseffectiveasofthedateofitsissuance.TheCommissionhasevaluatedthedemonstratedsafetymarginofthecontainmentsystemfor(FacilitName)underpresent
conditionsandhasconcludedthatsufficientmarginexiststoprecludeunduerisktothehealthandsafetyofthepublic.Thisevalua-tionisdocumentedinthestaff's"HarkIContainmentShortTermProgram.SafetyEvaluationReport,"NUREG-0408,Pecember1977.Thisexemptionisgrantedforaninterimperiodofapproximatelytwoyearswhileamoredetailedreviewi'sconducted.Attheconclusionofthisre-view,thedesignsafetymarginofthecontainmentsystemfor(FacilitNamewillberestoredtothatwhichwasoriginallyintendedatthetime(FacilitName)waslicensedforoperation.Thebasisforthisexemptionissetforthinthelettertothelicenseegrantingtheexemption,datedFebruary,1978.TheCommissionhasdeterminedthatthegrantingofthisexemptionwillnotresultinanysignificantenvironmentalimpactandthatpursuantto10CFRSection51.5(d)(4)anenvironmentalimpactstatementornegativedeclara-tionandenvironmentalimpactappraisalneednotbepreparedinconnectionwiththisaction.Forfurtherdetailswithrespecttothisaction,see(1)theCommission'slettertothelicenseedatedFebruary,1978,and(2)theCommission'
)~H,~"1IllII "MarkIContainmentShortTermProgramSafetyEvaluationReport,"NUREG-0408,December1977.TheseitemsareavailableforpublicinspectionattheCommission'sPublicDocumentRoom,1717HStreet,N.W.,Washington,D.C.andatthe(LPDR)Acopyofitem(1)maybeobtaineduponrequestaddressedtotheU.S.NuclearRegulatoryCommission,Washinq-ton,D.C.20555,,Attention:Director,DivisionofOperatingReactors.Acopyofitem(2)maybeobtaineduponrequestaddressedtotheNationalTechnicalInformationService,Sprinqfield,Virginia22161.DatedatBethesda,MarylandthisFORTHENUCLEARREGULATORYCOMMISSION,ChiefOperatinqReactorsBranchDivisionofOperatingReactors Cl NiagaraMohawkPowerCorporationcc:EugeneB.Thomas,Jr.,EsquireLeBoeuf,Lamb,Leiby5MacRae1757NStreet,N.W.Washington,D.C.20036AnthonyZ.RoismanNaturalResourcesDefenseCouncil91715thStreet,N.W.Washington,D.C.20005OswegoCountyOfficeBuilding46E.BridgeStreetOswego,NewYork13126