Author/Authors :
A.Sasahara، نويسنده , , T.Matsumura، نويسنده ,
Abstract :
Post-irradiationexaminations(PIEs)ofspentBWR-MOXandPWR-UO2fuelrodsirradiatedincommercialLWRsandstoredfor20yearswerecarriedouttoevaluatefuelintegrityduringstorage.Averageburn-upoffivefuelrodsoftheBWR-MOXfuelwasabout20MWd/kgHMandthatofthePWR-UO2fuelwas58MWd/kgHM.ThePIEitemsincluded:(a)visualinspectionofthecladdingsurface,(b)puncturetest,(c)ceramographicobservationonthepelletandcladding,(d)pelletdensity,(e)electronprobemicroanalysisofthepellet,(f)claddingtensiletest,(g)hydrogencontentandhydrideorientationinthecladding,and(h)hydrogenredistributioninthecladdingundertemperaturegradient.ThePIEresultsshowednomarkeddifferenceinthevisualinspection,fissiongasrelease,oxidelayerthickness,pelletmicrostructure,andcladdingmechanicalpropertiesorhydrideorientationafterstorage.Theresultofthehydrogenredistributionexperimentshowedthathydrogenmigrationhadlittleeffectonthefuelintegrityduringdrystorage.Hydrogenmigrationonthefuelrodfor40yearsofstoragewasevaluatedusingtheheatoftransportobtainedinthehydrogenredistributionexperimentandcalculatedresultshowedthathydrogenmigrationhadlittleeffectonthefuelintegrityduringdrystorage.
