Title of article
Impurityconcentrationbehaviorsinaboilingtubesheetcrevice:PartI.OpencreviceOriginalResearchArticle
Author/Authors
ChiBumBahn، نويسنده , , SiHyoungOh، نويسنده , , ByungGiPark، نويسنده , , IlSoonHwang، نويسنده , , InHyoungRhee، نويسنده , , UhChulKim، نويسنده , , JungWonNa، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2003
Pages
16
From page
129
To page
144
Abstract
Inalocallyrestrictedgeometryonthesecondarysideofsteamgenerator(SG)inapressurizedwaterreactor(PWR),impuritiesinbulkwatercanconcentratebyboilingprocessestoextremepHthatmaythenacceleratethecorrosionoftubingandadjacentmaterials.TosimulatearealSGtubesheetcrevice,ahightemperature/highpressure(HT/HP)crevicesimulationsystemwasconstructed.Thesimulatedcreviceareawasmonitoredwiththermocouplesandelectrodesforthemeasurementoftemperatureandelectrochemicalcorrosionpotential(ECP),respectively,inthecreviceaswellasatthefreespan.Asecondarysolutioncomposedof50ppmNaand200ppbhydrogen(H2)wassupplied.Inanopentubesheetcrevicewith0.15mmradialgap,axialdistributionoftemperatureandECPweremeasuredasafunctionoftimeandavailablesuperheat,ΔT.Thesodiumhydroxide(NaOH)concentrationprocessinthecrevicewascharacterizedwithtemperatureandECPdata.ItwasobservedfromtemperatureresultsthattheliquidpenetrationdepthdecreasedandthedryregionexpandedfromthebottomofthecreviceasΔTincreased.MeasuredECPdatashowedabehaviorsimilartothehydrogenelectrodepotentialbehaviorpredictedbytheNernstequation.Frommeasuredvaluesofboilingpointelevation,themaximumcreviceconcentrationfactorwasestimatedtobeabout500atΔT=20°Candabout1000atΔT=25°Cacrossthetubingwall.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2003
Journal title
Nuclear Engineering and Design Eslah
Record number
894602
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