Author/Authors :
B.R.Sehgal، نويسنده , , A.Karbojian، نويسنده , , A.Giri، نويسنده , , O.Kym?l?inen، نويسنده , , J.M.Bonnet، نويسنده , , K.Ikkonen، نويسنده , , R.Sairanen، نويسنده , , S.Bhandari، نويسنده , , M.Buerger، نويسنده , , J.Dienstbier، نويسنده , , Zsolt Téchy، نويسنده , , T.Theofanous، نويسنده ,
Abstract :
Theassessmentofreactorvesselintegrity(ARVI)projectinvolvedatotalofnineorganizationsfromEuropeandUSA.Theworkconsistedofexperimentsandanalysisdevelopment.ThemodelingactivitiesintheareaofstructuralanalyseswerefocusedonthesupportofEC-FOREVERexperimentsaswellasontheexploitationofthedataobtainedfromthoseexperimentsformodelingofcreepdeformationandthevalidationoftheindustrystructuralcodes.Workwasalsoperformedforextensionofmeltnaturalconvectionanalysestoconsiderationofstratification,andmixing(intheCFDcodes).Othermodelingactivitieswerefor(1)gapcoolingCHFand(2)developingsimplemodelsforsystemcode.Finally,themethodologyanddatawasappliedforthedesignofIVMRsevereaccidentmanagementschemeforVVER-440/213plants.
Theworkwasbrokenupintofivepackages.Theyweredividedintotasks,whichwereperformedbydifferentpartners.ThemajorexperimentalprojectcontinuedwasEC-FOREVERinwhichdatawasobtainedonin-vesselmeltpoolcoolability.InpreviousEC-FOREVERexperimentsdatawasobtainedonmeltpoolnaturalconvectionandlowerheadcreepfailureandrupture.Thoseresultsobtainedwererelatedtothefollowingissues:(1)multiaxialcreeplawsfordifferentvesselsteels,(2)effectsofpenetrations,and(3)modeandlocationoflowerheadfailure.ThetwoEC-FOREVERtestsreportedherearerelatedto(a)theeffectivenessofgapcoolingand(b)wateringressionforinvesselmeltcoolability.Twootherexperimentalprojectswerealsoconducted.OnewastheCOPOexperiments,whichwasconcernedwiththeeffectsofstratificationandmetallayeronthethermalloadsonthelowerheadwallduringmeltpoolconvection.ThesecondexperimentalprojectwasconductedatULPUfacility,whichprovideddataandcorrelationsofCHFduetotheexternalcoolingofthelowerhead.
