RG1.035.1 预应力混凝土安全壳检查的预应力大小确定 1990

A.INTRODUCTIONGeneralDesignCriterion53,ProvisionsforContainmentTestingandInspection,ofAppendixA,GeneralDesignCriteriaforNuclearPower-Plants,to10CFRPart50,DomesticLicensingofProductionandUtilizationFacilities,requires,inpart,thatthereactorcontainmentbedesignedtopermit(1)periodicinspectionofallimportantareasand(2)anappropriatesurveillanceprogram.RegulatoryGuide1.35,InserviceInspectionofUngroutedTendonsinPrestressedConcreteContainmentStructures,describesabasisacceptabletotheNRCstafffordevelopinganappropriateinserviceinspectionandsurveillanceprogramforungroutedtendonsinprestressedconcretecontainmentstructuresoflightwater-cooledreactors.ThisguideexpandsandclarifiestheNRCstaffpositionondeterminingprestressingforcestobeusedforinserviceinspectionsofprestressedconcretecontainmentstructures.TheAdvisoryCommitteeonReactorSafeguardshasbeenconsultedconcerningthisguideandhasconcurredintheregulatoryposition.Anyinformationcollectionactivitiesmentionedinthisregulatoryguidearecontainedasrequirementsin10CFRPart50,whichprovidestheregulatorybasisforthisguide.Theinformationcollectionrequirementsin10CFRPart50havebeenclearedunderOMBClearanceNo.3150-0011.USN-RCREGULATORYGUIDESRegulatoryGuidesareissuedtodescribeandmakeavailabletothepubIlemethodsacceptabletotheNRCstaffofImplementingspecificpartsoftheCommission'sregulations,todelineatetechniquesusedbythestaffInevaluatingspecificproblemsorpostulatedaccidents,ortoprovideguidancetoapplicants.RegulatoryGuidesarenotsubstitutesforregulations,andcompliancewiththemIsnotrequired.MethodsandsolutionsdifferentfromthosesetoutintheguideswillbeacceptableIftheyprovideabasisforthefindingsrequisitetotheissuanceorcontinuanceofapermitorlicensebytheCommission.ThisguidewasIssuedafterconsiderationofcommentsreceivedfromthepublic.CommentsandsuggestionsforImprovementsIntheseguidesareencouragedatalltimes,andguideswillberevised,asappropriate,toaccommodatecommentsandtoreflectnewinformationorexperience.WrittencommentsmaybesubmittedtotheRegulatoryPublicationsBranch,DFIPS,ADM,U.S.NuclearRegulatoryCommission,Washington,DC20555.July1990.UIDEB.DISCUSSIONTheinspectionsofprestressedconcretecontainmentstructures(withgreasedorgroutedtendons)areperformedwiththeobjectiveofensuringthatthesafetymarginspostulatedinthedesignofcontainmentstructuresarenotreducedunderoperatingandenvironmentalconditions.Ofparticularconcerninthecaseofprestressedconcretecontainmentstructuresisthepossibledegradationoftheprestressingtendonsystembycorrosion.TherecommendedinserviceinspectionprogramsofRegulatoryGuides1.35and1.90,InserviceInspectionsofPrestressedConcreteContainmentStructureswithGroutedTendons,areformulatedtoachievethisbasicobjective.Theextenttowhichtheprogramscanperformtheirintendedfunctiondependsonthemethodoftheirimplementation.Reviewofreportsofsomeoftheinspectionsperformedbylicenseesongreasedtendonsindicatesthattherearevariousways(simplebutimprecise)ofcombiningthelossesinprestressingforces,givingawidebandoftoleranceincomparingthemeasuredresults.SuchapracticeisnotacceptabletotheNRCstaffbecausearealandsubstantialdegradationofthetendonsystemmayremainundetected.RegulatoryGuide1.35recommendsthecomparisonofmeasuredprestressingforceswiththepredictedforcesofrandomlyselectedtendons.ThepredictedforcesatagiventimearebasedonthemeasurementofprestressingforcesduringinstallationminusthelossesintheprestressingforcesthatwerepredictedtoTheguidesareIssuedinthefollowingtenbroaddivisions:1.PowerReactors2.ResearchandTestReactors3.FuelsandMaterialsFacilities4.EnvironmentalandSiting5.MaterialsandPlantProtection6.Products7.Transportation8.OccupationalHealth9.AntitrustandFinancialReview10.GeneralCopiesofissuedguidesmaybepurchasedfromtheGovernmentPrintingOfficeatthecurrentGPOprice.InformationoncurrentGPOpricesmaybeobtainedbycontactingtheSuperintendentofDocuments,U.S.GovernmentPrintingOffice,PostOfficeBox37082,Washington,DC20013-7082,telephone[phone]or(202)275-2171.IssuedguidesmayalsobepurchasedfromtheNationalTechnicalInformationServiceonastandingorderbasis.DetailsonthisservicemaybeobtainedbywritingNTIS,5285PortRoyalRoad,Springfield,VA22161.U.S.NUCLEARREGULATORYCOMMISSIONREGULATORY(OFFICEOFNUCLEARREGULATORYRESEARCHREGULATORYGUIDE1.35.1(TaskSC807-4)DETERMININGPRESTRESSINGFORCESFORINSPECTIONOFPRESTRESSEDCONCRETECONTAINMENTShaveoccurredsincethattimebecauseofmaterialandstructuralcharacteristics.Asvariouscomplexinteractingphenomenaareinvolvedinthepredictionoftheselosses,thechanceissmallthatthemeasuredprestressingforcewillagreequitecloselywiththepredictedvalue.Hence,RegulatoryPosition2.2ofthisregulatoryguiderecommendsthedeterminationoflimits(upperandlower)ofprestressingforceasafunctionoftime.Revision1ofRegulatoryGuide1.90discussesthisaspectbriefly,asitisalsorelevanttotherecommendedinspectionalternativesinthatguide.ThissupplementaryguideisintendedtoclarifytheNRCstaff'spositionontheconstructionoftolerancebandsforgroupsandsubgroupsoftendonssothatthesmall-sampleinspectionprogramofRegulatoryGuide1.35canprovidebetterconfidenceintheintegrityofprestressingtendons.Theregulato