Mercatali, Luigi

Sanchez, Victor

Zhang, Kanglong

English

KITopen

Institute for Neutron Physics and Reactor Technology (INR)KIT – The Research University in the Helmholtz Association www.kit.eduSMR-Core Analysis at pin-level using PARCS-SP3Kanglong Zhang; Victor Sanchez; Luigi MercataliSpring 2022 CAMP MeetingMay, 20222Presentation OutlinePin-wise TH FeedbackPin-wise Simulation with “ASSY_TYPE”Pin-wise XS OptimizationFunction Extension of PARCS V331 Steady State pin-by-pin Simulation for KIT-SMRTransient SimulationImplementation to PARCS-ICoCoCoupling with TH codeSMR-Core Analysis at pin-level using PARCS-SP3Motivation:Development:Verification:Sumarry and Outlook:Spring 2022 CAMP MeetingMay, 20223Motivation: Pin-wise Simulation, XS Optimization, TH FeedbackPin-wise results are importantThe discussion in this slide only concern Cartesian geometryPARCS V331 has two methods for pin-wise results:• Nodal + Pin power reconstruction• FMFD (Fine Mesh Finite Difference)Advantage:• Fast running.Limitation:• No Pin-wise TH coupling.• No Pin-wise XS optimization.Advantage:• SP3 Pin-wise simulation.Limitation:• Use “PLANAR_REG”, no “ASSY_TYPE”. PLANAR_REG PLANAR_LATIn KIT, we would like to do:• Pin-by-pin simulation in core-scale with “ASSY_TYPE”.• Enable pin-wise XS optimization and TH feedback.PARCS V331 can not do thisFunction extension is requiredSpring 2022 CAMP MeetingMay, 20224Development: Function Extension of PARCS V 331The discussion in this slide only concern Cartesian geometryWorkflow of PARCS V331:• Input processing• Calculation• Output processingFor pin-by-pin SP3 simulation with “ASSY_TYPE” activated:• the most straightforward way is to compose the input files as cases using traditional nodal solvers.• PARCS V331 has problems dealing with “big data”.Memory problemsFor exampleInput blocks:• CNTL• PARAM• GEOM• FDBK• TH• DEPLSmall Matrix OKLarge Matrix KOIn GEOM, the problem in • “RAD_CONF” • “BANK_CONF”Function extension:• 20 files related to input and output processing were modified.• PARCS V331 now works well with “big data”.Spring 2022 CAMP MeetingMay, 20225Verification: Steady State pin-by-pin Simulation for KIT-SMRCase Specification – KIT-SMR – assembly configuration:1 2 11 3 4 3 11 4 4 4 4 4 11 3 4 4 5 4 4 3 12 4 4 5 6 5 4 4 21 3 4 4 5 4 4 3 11 4 4 4 4 4 11 3 4 3 11 2 13 4 58217611101514182022252428 29333238 39 4037363491230353126 27232119171613Radial configuration40 radial reflectors57 fuel assemblies, 6 types, 2 poison types3.03.23.22.03.42.02.04.2P12.02.52.02.53.0P24.0P22.5 2.52.0 2.03.8P23.2P21 2 3 4 5 6A A A B B BBurnable Poison Rod: A‐20, B‐24Assembly TypeAxial configurationP1 – Type A 20 poison rods P2 – Type B 24 poison rods 236.5 cm21.5 cmActive200 cmSpring 2022 CAMP MeetingMay, 20226Verification: Steady State pin-by-pin Simulation for KIT-SMRCase Specification – KIT-SMR – control rod configuration:a ab a c a bb d b b b d ba a b e e e b a ac b e f e b ca a b e e e b a ab d b b b d bb a c a ba aaAICbB4CcSScAICcSSdAICdAICdSSeAIC fAICeAICfAICeSSfSSO OO O I O OO I O O O I OO O O I I I O O OI O I O I O IO O O I I I O O OO I O O O I OO O I O OO ORadial configuration• 6 typesAxial configuration• AIC – AgInCd• SS – Stainless Steel• B4CCritical configuration• I – fully inserted• O – fully withdrawSpring 2022 CAMP MeetingMay, 20227Verification: Steady State pin-by-pin Simulation for KIT-SMRModeling – KIT-SMR – PARCS:SERPENT6 fuel assembly types:6 control rod types:2 poison rod configurations:8 enrichments3 absorber materials2 materials35 material configurations for fuel assembliesPARCSInputs for35*n_branchInputs for35*n_branchpin-wise XSSPH systemOptimized pin-wise XS+Fuel PMAXS.CNTL file.PARAM file.FDBK file.TH file.GEOM file.DEPL fileReflectorPMAXS6948 XS definition corresponding to PMAXS files 187*187 pin matrix for:Core radial geometryCore radial control rod configurationOptional – Reflector rotation definition2900 definition of ASSY_TYPE PARCS TH codepin-wisefeedbackTo be verified:Pin-by-pin multi-physics coupling systemSpring 2022 CAMP MeetingMay, 20228Verification: Steady State pin-by-pin Simulation for KIT-SMRFirst Results – uniform fuel assembly (enrichment 2.0%, no CR):Axial power distributionRadial power distributionSpatial power distributionSpring 2022 CAMP MeetingMay, 20229Verification: Steady State pin-by-pin Simulation for KIT-SMRFirst Results – KIT-SMR – All Rods Out (AIO) – radial relative power distribution:Original pin-wise XS from SerpentSPH optimizedpin-wise XSHottest channelsLocal safety parametersHottest channelsLocal safety parametersSpring 2022 CAMP MeetingMay, 202210Verification: Steady State pin-by-pin Simulation for KIT-SMRFirst Results – KIT-SMR – All Rods Out (AIO) – spatial relative power distribution:Original pin-wise XS from SerpentSpring 2022 CAMP MeetingMay, 202211Verification: Steady State pin-by-pin Simulation for KIT-SMRFirst Results – KIT-SMR – All Rods Out (AIO) – spatial relative power distribution:SPH optimized pin-wise XSSpring 2022 CAMP MeetingMay, 202212Summary and OutlookPin-by-Pin Parcs SimulationPin-by-PinMulti-physics System Parcs-THWithASSY_TYPEenabledXS Optimizationpossible+Motivation 1Motivation 2Motivation 3ProblemParcs V331 can not process “big data”Development20 files related to input and output processing modifiedSteady State VerificationKIT-SMR large data sizeTransient VerificationKIT-SMR Rod Ejection AccidentOutlook 1Implementation toPARCS-ICOCOWithin the McSAFER packagePin-by-Pin Couplingwith TH codeSubChanFlow / TwoPorFlowOutlook 2Outlook 3Spring 2022 CAMP MeetingMay, 202213Questions and Problems1. PARCS V331 crash due to illegal operation when do the 3rd nodal update:• The reflector XS relates to the problem.• When the neutron leakage is not significant, PARCS runs well.• When the neutron leakage is significant, PARCS crash at the 3rd nodal updating.2. How to merge two PMAXS files into one single PMAXS file.• One file contain the XS data without CR, the other contain the XS with XR.• Use GenPMAXS to combine the two PMAXS files?

SMR-Core Analysis at pin-level using PARCS-SP3

https://publikationen.bibliothek.kit.edu/1000147676/148862988

SMR-Core Analysis at pin-level using PARCS-SP3

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