Title of article
Experimentsonin-vesselmeltcoolabilityintheEC-FOREVERProgramOriginalResearchArticle
Author/Authors
B.R.Sehgal، نويسنده , , A.Giri، نويسنده , , U.Chikkanagoudar، نويسنده , , A.Karbojian، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2006
Pages
12
From page
2199
To page
2210
Abstract
Thispaperreportstheresultsfromtheexperimentsconductedonthecoolabilityofcoriummeltduringasevereaccidentscenariowhenthebottomheadisfullofthecoremelt,undergoingnaturalcirculation.TheseexperimentsarepartoftheEC-FOREVERPrograminwhichvesselfailureexperimentshavealsobeenperformed.Theexperimentsareperformedina1/10thscalevessel(≅400mmdiameterand15mmwallthickness)andtheoxidicmeltemployedisthemixtureCaO+B2O3at≅1400K,representingthecoriummeltmixtureofUO2+ZrO2.
Theexperimentsemployedaninitialphase,duringwhichuniformvolumetricheatingofthemeltwasprovidedandthevesselwaspressurisedto≅25bar,forseveralhours,togeneratemaximumcreepdeformationof≅5%,inordertoprovidetheconditionsfortheformationofagapbetweenthemelt-poolcrustandthebottomheadwall.Afterthisphase,thevesselwasfloodedwithwater.
DatawereobtainedononlythevesselandthemeltpooltemperaturesinoneoftheEC-FOREVERexperimentsreportedhere.Inthesecondexperiment,however,besidesthetemperaturedata,additionaldatawereobtainedonthesteamflowrateandtheheattransfertothewater,attheupperfaceofthemeltpool,asafunctionoftime.
Itwasfoundthatthegapcoolingmechanismwasnoteffectiveinreducingthevesselwalltemperaturesafterwaterflooding.Post-testexaminationsrevealedthatthewateringressionextendedtothedepthofonly≅60mminthemeltpool.ThecharacteroftheheattransfertothewaterfromthemeltpooluppersurfacewasfoundtobesimilartothatobservedintheMACEtestsforthecoolabilityofanex-vesselmeltpoolfloodedbywateratthetop.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2006
Journal title
Nuclear Engineering and Design Eslah
Record number
941332
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