Title of article
Neutrontransportbenchmarkexampleswithweb-basedAGENTOriginalResearchArticle
Author/Authors
TatjanaJevremovic، نويسنده , , ShanjieXiao، نويسنده , , NaderSatvat، نويسنده , , GodfreeGert، نويسنده , , JohnHopkins، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2008
Pages
12
From page
1975
To page
1986
Abstract
TheAGENT(ArbitraryGEometryNeutronTransport)anopen-architecturereactormodelingtoolisdeterministicneutrontransportcodefortwo-orthree-dimensionalheterogeneousneutronicdesignandanalysisofthewholereactorcoresregardlessofgeometrytypesandmaterialconfigurations.TheAGENTneutrontransportmethodologyisapplicabletoallgenerationsofnuclearpowerandresearchreactors.Itcombinesthreetheories:(1)mathematicaltheoryofR-functionsthatisusedtogeneraterealthree-dimensionalgeometriesofsquareorhexagonalheterogeneousgeometries,(2)thex–ymethodofcharacteristics(MOC)usedtosolveisotropicneutrontransportinnon-homogenized2Dreactorslices,and(3)theone-dimensionaldiffusiontheoryorMOCtheoryusedtocouplethex–yandzneutrontracksthroughthetransverseleakageandangularmesh-wisefluxvalues.TheR-functiongeometricalmoduleallowsasequentialbuildingofthelayersofgeometryandautomaticsubmeshingbasedonthenetworkofgeometricdomainfunctions.ThesimplicityofgeometrydescriptionandselectionofparametersforaccuratetreatmentofneutronpropagationisachievedthroughtheBooleanalgebraichierarchicallyorganizedsimpleprimitivesintocomplexdomains(bothbeingrepresentedwithcorrespondingdomainfunctions).AGENTmethodologiesandnumericalsolutionsareapplicableinvalidatingneutronicanalysisforGenIVreactordesignswhiletheeffectofdoubleheterogeneityinveryhightemperaturereactors(VHTRs)isunderdevelopment.TheaccuracyiscomparabletoMonteCarlocodesandisobtainedbyfollowingneutronpropagationthroughrealgeometricaldomainsthatdoesnotrequirehomogenizationorsimplifications.Theefficiencyismaintainedthroughsetofaccelerationtechniquesintroducedatallimportantcalculationlevels.Thefluxsolutionincorporatespoweriterationwithtwodifferentaccelerationtechniques:coarsemeshrebalancing(CMR)andcoarsemeshfinitedifference(CMFD).Thestand-aloneoriginallydevelopedgraphicaluserinterfaceoftheAGENTcodedesignenvironmentallowstheusertoviewandverifyinputdatabydisplayingthegeometryandmaterialallocation.Theusercanalsoviewtheoutputdatasuchasthree-dimensionalmapsoftheenergy-dependentmesh-wisescalarflux,reactionratesandpowerpeakingfactors.TheAGENTcodeisinaprocessofanextensiveandrigoroustestingforvariousreactortypesthroughtheevaluationofitsperformance(abilitytomodelanyreactorgeometrytype),accuracy(incomparisonwithMonteCarloresultsandotherdeterministicsolutionsorexperimentaldata)andefficiency(computationalspeedthatisdirectlydeterminedbythemathematicalandnumericalsolutiontotheraytracinganditerativeapproachofthefluxconvergence).ThispaperoutlinesmainaspectsofthetheoriesunifiedintotheAGENTcodeformalismanddemonstratesthecodeperformance,accuracyandefficiencyusingfewrepresentativeexamples.TheAGENTcodeisamainpartofthevirtualreactorsystemdevelopedfornumericalsimulationsofresearchreactors.Fewillustrativeexamplesofthewebinterfacearebrieflyoutlined.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2008
Journal title
Nuclear Engineering and Design Eslah
Record number
895152
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