Title of article
Gas-cooledfastreactors—StatusofCEApreliminarydesignstudiesOriginalResearchArticle
Author/Authors
P. Dumaz، نويسنده , , P.Allègre، نويسنده , , C.Bassi، نويسنده , , T.Cadiou، نويسنده , , A.Conti، نويسنده , , J.C.Garnier، نويسنده , , J.Y.Malo، نويسنده , , A.Tosello، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2007
Pages
10
From page
1618
To page
1627
Abstract
Thegas-cooledfastreactor(GFR)isoneofthesixreactorconceptsselectedintheframeoftheGenerationIVinitiative.ThemostsignificantGFRoptionistheuseofaheliumhightemperatureprimarycoolant.Theheliumoptionisveryattractive(chemicalinertness,neutrontransparency,etc.)butitleadstoveryspecificthermal-hydraulicissues.
Asfarasthereactorcoredesignisconcerned,aceramicfuelconceptwithagoodthermalconductivityhasbeenchosen.Themainrequirementistoobtainanaverageexitcoretemperatureof850°C(energyconversionefficiency)withamaximumfueltemperatureofabout1200°Candwithalowcorepressuredrop(inordertoeasethedecayheatremoval).Themaincorecharacteristicshavebeendeterminedfortworeactorpowers:amediumone(600MWth)andalargeone(2400MWth).Forvariousreasons,thislatterbecametheCEAreferencechoice.Aconsistentsetofcoreparametershasbeendeterminedtakingintoaccountthedifferentconstraintsincludingthethermal-hydraulics.Thereferencearrangementproposedisbasedonplatefuelelements.
AsignificantissuefortheGFRisthedecayheatremoval.Aninnovativeapproachhasbeenchosenincaseoflossofcoolantaccidents(LOCAs).A“guardcontainment”enclosingtheprimarysystemisusedtomaintainamediumgaspressure(10bar)inordertoremovethedecayheatbylowpowerforcedconvectionsystemsintheshorttermandnaturalconvectionsystemsinthelongterm.Thisguardcontainmentisnotpressurizedduringnormaloperationsandcanbeametallicstructure.
Asfarastheenergyconversionsystemisconcerned,anindirect-combinedcyclehasbeenchosen.Thesignificantadvantagesofthischoiceare:amoderatecoreinlettemperature(400°Cinsteadof480°Cforthedirectcycle)andanattractivecompactnessoftheprimarysystem(facilitatingtheguardcontainmentdesign).
Duetothenoveltyoftheseoptions,asignificanteffortofcomponentspre-sizinganddesigncalculationshasbeenachieved.Followingthiseffort,aCATHAREmodelofthereactorsystemhasbeenmadeandthecalculationofthereactorsteady-stateconfirmstheconsistencyoftheoverallsystempre-sizing.Thismodelhasbeenusedforafirsttransientcalculation.Othertypesoftransientshavetobeanalyzed,however,itisthoughtthattheproposedGFRdesigncanreachthesafetyrequirementsofGenerationIVsystems.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2007
Journal title
Nuclear Engineering and Design Eslah
Record number
941346
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