Gabriel, S.

Gabrielli, F.

Imke, U.

Mercatali, L.

Ottenburger, S.

Steinbrück, M.

Stieglitz, R.

Stuckert, J.

Sánchez-Espinoza, V. H.

Tromm, W.

Zhang, K.

English

KITopen

KIT – The Research University in the Helmholtz Association www.kit.eduInstitute for Neutron Physics and Reactor Technology (INR)KIT Computational Route for the Safety Assessment and Radiological Risk Prediction of NPPsDr. V. H. Sánchez Espinoza, F. Gabrielli, K. Zhang, L. Mercatali, U. Imke, M. Steinbrück, J. Stuckert, S. Gabriel, S. Ottenburger, R. Stieglitz, W. Tromm Presented by L. MercataliINR, MACH, KIT CN2OutlineMotivation Challenges for the Computational Tools for Safety & Risk Assessment KIT Computational Route for Safety Assessment of NPPs• Multiphysiscs• Multi-scale KIT Computational Route for Estimation of radiological risk from NPPs Final remarks159. RSK-AST: Berichterstattung zur deutschen Rechenkette/Nutzung von Rechencodes12.06.2023INR, MACH, KIT CN3MotivationNuclear energy use for electricity generation ends April 2023159. RSK-AST: Berichterstattung zur deutschen Rechenkette/Nutzung von Rechencodes12.06.2023Dismantling of Nuclear Power Plants will last for decades• Expertise in nuclear power plants, reactor physics, radiation protection, etc.Many NPP under operation around Germany and worldwide• VVER-1200, AP-1000, EPR, LW-SMR, APR1400, research reactors, etc.  Germany: Keep expertise on Methodologies to assess  the hypothetical risk that may arise from the operation of NPPs   • One of the HGF mission Hypothetical severe accidents with FP-release cannot be excluded • National regulators: want to know reliable data about expected radiological risk (amount and timing of FP-releases around the NPP)  INR, MACH, KIT CN4Potential Risk from NPPs under operation around Germany12.06.2023 159. RSK-AST: Berichterstattung zur deutschen Rechenkette/Nutzung von Rechencodes2023 AprilRadiological consequences of hypothetical Severe Accidents AROUND GERMANY  Number of NPP around Germany:  5+58+7+15+1+10+6= 102 Fukushima: Cesium 137 Contamination (measured)INR, MACH, KIT CN5Challenges for the Computational Tools for Safety & Risk Assessment 159. RSK-AST: Berichterstattung zur deutschen Rechenkette/Nutzung von Rechencodes12.06.2023INR, MACH, KIT CN6Drivers for the continuos development of numerical toolsContinuous development of nuclear power plant technologyImprove economics, operational flexibility and safetystandardsAdvances in numerical algorithms and computer power• Availability of huge and cheap HPC-clusters• Pave the way to increase prediction accuracy, fidelity and spatialdiscretization of computational domains159. RSK-AST: Berichterstattung zur deutschen Rechenkette/Nutzung von Rechencodes12.06.2023INR, MACH, KIT CN7AP-1000NPP Technology Developments: Drivers SMR SMARTRR with MTR-Fuel12.06.2023 159. RSK-AST: Berichterstattung zur deutschen Rechenkette/Nutzung von RechencodesAPR1400VVER-1200/V-491EPR GE ABWR INR, MACH, KIT CN8KIT Computational Route for Safety Assessment ofNPPs159. RSK-AST: Berichterstattung zur deutschen Rechenkette/Nutzung von Rechencodes12.06.2023INR, MACH, KIT CN9KIT Computational Route for NPP Analysis159. RSK-AST: Berichterstattung zur deutschen Rechenkette/Nutzung von Rechencodes12.06.2023KIT computational tools for the analysis of Design Basis Accidents (DBA) KIT Strategy:• Development of in-house codes (Parafish, SCF, TPF, KATSA)• Use of international codes embedded in international co-operations ( USNRC CAMP)• Extend capability of international codes: multiphysics and multi-scale coupling • Validation using data from in-house tests (COSMOS-L /-H) and external data In-house codes:- PARAFISH- TWOPORFLOW- SUBCHANFLOW- KATUSAINR, MACH, KIT CN10KIT: Multi-physics Approach for Core AnalysisImproved core thermal hydraulics (in-house): • Subchannel codes: SUBCHANFLOW (SCF) • Porous-media two-phase flow 3D code: TWOPORFLOW (TPF)Improved neutronics: • Parallel finite element neutronic transport solvers e.g. PARAFISH (in-house) • Monte Carlo codes: MCNP, Serpent2 (external)Uncertainty & sensitivity analysis tools• KATUSA (KArlsruhe Tool for Uncertainty and Sensitivity Analysis) Coupling of in-house codes (TH, N) with external nodal Diffusion and Monte Carlo solvers: Flexible and modular approach (ICoCo) • SUBCHANFLOW/PARCS,  TWOPORFLOW/PARCS• PARAFISH/TWOPORFLOW• SUBCHANFLOW/Serpent2 (novel transient analysis based on MC)12.06.2023 159. RSK-AST: Berichterstattung zur deutschen Rechenkette/Nutzung von RechencodesINR, MACH, KIT CN11KIT approach:Multiphysics coupling based on ICoCo159. RSK-AST: Berichterstattung zur deutschen Rechenkette/Nutzung von Rechencodes12.06.2023Multi-physics core analysisICoCo-Based CouplingPARCSPARCSTPFP Tm, Tf, ρmSS convergence?Steady-stateTransientTPFP Tm, Tf, ρmtn < t_end?startendKey features:• Flexible and modular • Domain overlapping: mesh to meshsuperposition (N  TH)• Automatic exchange of “Feedbackparameters”: MEDCoupling library• Inbuild interpolation methods (1D, 2D, 3D)Flowchart of PARCS/TPF Coupling(Explicit OS Picard Iteration)INR, MACH, KIT CN12REA at Hot zero power (HZP) CR worth of extracxted rod: 0.725 $KSMR: REA Analysis at HZP Parameter ValueInitial core power 1.0E-4 %Highest CR worth 1.45 $Ejection duration 0.05 sEnd of transientsimulation 1.0 sExtractedCR3D Core radial power distribution KSMR: Evolution of the total reactivity after the REA KSMR: Evolution of the total power after REA 12.06.2023 159. RSK-AST: Berichterstattung zur deutschen Rechenkette/Nutzung von RechencodesINR, MACH, KIT CN13Multi-physics /-scale Plant Analysis Methodologies159. RSK-AST: Berichterstattung zur deutschen Rechenkette/Nutzung von Rechencodes12.06.2023INR, MACH, KIT CN14Methods for Safety Evaluations of NPPs159. RSK-AST: Berichterstattung zur deutschen Rechenkette/Nutzung von Rechencodes12.06.2023ICoCo-Based CouplingMcSAFER Solution Approach: Industrial tools:• 1D / 3D coarse mesh TH codes: TRACE, RELAP5, etc. KIT research tools:• Multiscale coupling of system TH with subchannel-codes‣ TRACE/SCF/PARCS• Multiscale coupling of system TH with CFD-codes‣ TRACE/OpenFOAM/PARCSFrench NUWARD DesignIntegrated RPV• Pumps• HXs=>3D flowINR, MACH, KIT CN15KIT Analysis Approach: TRACE/PARCS/OpenFOAMOpenFOAM DomainTRACE Domain: Core + RPV + PlantTRACE Domain: Core + RPVICoCo-based TRACE-OpenFOAM and PARCS/TRACE coupling12.06.2023 159. RSK-AST: Berichterstattung zur deutschen Rechenkette/Nutzung von RechencodesINR, MACH, KIT CN16KIT Computational Route for Estimation ofradiological risk from NPPs  159. RSK-AST: Berichterstattung zur deutschen Rechenkette/Nutzung von Rechencodes12.06.2023INR, MACH, KIT CN17Predictionof the radiological risk of Severe Accidents159. RSK-AST: Berichterstattung zur deutschen Rechenkette/Nutzung von Rechencodes12.06.2023Required computational tools needed for reliable prediction of the radiological impact: Neutronic, system thermal hydraulic, severe accident codes, and radiological impact (dispersion of FP)Emergency TEAM main concern: Time and amount of FP-release to the ENV! PWR severe accident ASTEC: Time and amount of Activationincluding uncertainty bandINR, MACH, KIT CN18KIT Strategy for Severe Accident Research159. RSK-AST: Berichterstattung zur deutschen Rechenkette/Nutzung von Rechencodes12.06.2023EMUG User Group CommunityCooperative Severe Accident Research Program (CSARP)MELCOR Code Assessment Program (MCAP)- Many partners from EU, Asia, East Europe, etc.MELCORASTECEuropean Severe Accident Code (IRSN)ASTEC User Group: 40 organizations:- EU- Asia: China, India, Korea- East Europe: Russia, Lithuania, Belarus, Bulgaria, Romania, Hungary- America: Canada - KIT Experimental facilities e.g. MOCKA, BETA, LIVE, CORA, QUENCH - External data: PHEBUS, etc.ValidationASCOM User Group CommunityStrategic partnership with leading EU (France: IRSN) and international (US NRC) organizationsInternationalization and knowledge gain due to regular meetings around the worldRODOS/ JRODOSINR, MACH, KIT CN19Provide consistent and comprehensive information at local, regional and national levels, for all accident phases• During real event (housing and displaying of relevant information about the release, the weather, the contamination; forecast of health, agricultural and economic impacts with and without the application of countermeasure) • When preparing for a possible future event (creating scenarios and background material for planning, exercises and training)Assist  decision makers in evaluating different measures against a range of quantitative and qualitative criteriaPromote a common emergency management frame aiming to move away from national solutionsRODOS/JRODOSdecision support system for off-site nuclear emergency management12.06.2023 159. RSK-AST: Berichterstattung zur deutschen Rechenkette/Nutzung von RechencodesINR, MACH, KIT CN20RODOS/JRODOS: Real-time On-line Decision Support system12.06.2023Environmental Contamination of Air, Ground, and Food,  Potential DosesAreas, Organ Doses, People affected by Countermeasures, Health Effects, Effort, CostsRanked List of Feasible Strategies of Long-Term Counter-measures (MAVT)Radiological Monitoring Data Meteorological and Release Data159. RSK-AST: Berichterstattung zur deutschen Rechenkette/Nutzung von RechencodesJRODOS tasks, input data, outputINR, MACH, KIT CN21RODOS/JRODOS: EMERGENCY chain models12.06.2023AccidentRelease of 52 hoursDose rate and dose, early countermeasures159. RSK-AST: Berichterstattung zur deutschen Rechenkette/Nutzung von RechencodesINR, MACH, KIT CN22RODOS/JRODOS: Real-time On-line Decision Support system159. RSK-AST: Berichterstattung zur deutschen Rechenkette/Nutzung von Rechencodes12.06.2023■ RODOS installation ■ RODOS local users ■ Ongoing Installations in West Balkan countries, GCC countries and IranWorld-wise installations (>40 countries, ongoing)INR, MACH, KIT CN23Examples: PWR Konvoi Radiological Consequences159. RSK-AST: Berichterstattung zur deutschen Rechenkette/Nutzung von Rechencodes12.06.2023JRODOS: Total dose from all exposure 10 days after a hypothetical MBLOCA accident in a generic KONVOI NPP at the Cattenom site: Winter time.JRODOS: Total dose from all exposure 10 days after a hypothetical MBLOCA accident in a generic KONVOI NPP at the Cattenom site: Summer time.ASTEC:  KONVOI PWR containment model ASTEC: Amount of Xe and I and Cs aerosols in containment as fraction of the initial fuel mass in the core in the MBLOCAKORIGENASTECJRODOSComputational tools:INR, MACH, KIT CN24Examples: VVER-1000 Radiological Consequences159. RSK-AST: Berichterstattung zur deutschen Rechenkette/Nutzung von Rechencodes12.06.2023JRODOS: Simulated maximum activity of cesium isotopes in the cow’s milk at the end of 10th day of radiological dispersion for the LBLOCA on the cold leg accident case with Station Black OutASTEC:  VVER-1000 Containment Model ASTEC:  VVER-1000 Primary and Secondary Plant Model KORIGEN ASTEC JRODOSComputational tools:INR, MACH, KIT CN25Final RemarksKIT computation route established at KIT thanks to the Helmholtz NUSAFE long- term research program (KIT, HZDR, FZJ)  • Allow safety assessment of different reactor designs and• Make possible the prediction of the radiological risk from severe accidents that mayhappen elsewhere in the worldKIT research activities are embedded in international co-operations with the US NRC and French IRSN • National: HZDR, FZJ, GRS, RUB, UNI STU, FRAMATOME, WED, PEL, etc.• International: VTT, CEA,UPM,, PSI, KTH, TRACTBEL, ENEA, CIEMAT, etc.• Active contribution to OECD/NEA, IAEA research projectsComputation route for safety and risk analysis is supported by KIT experimental research program (e.g. QUENCH, COSMOS facilities)Expertise on reactor physics and neutronics are highly relevant for safetyinvestigations of intermediate waste storage (inventories, decay heat) and forthe optimization of the decommissioning of NPPs 159. RSK-AST: Berichterstattung zur deutschen Rechenkette/Nutzung von Rechencodes12.06.2023INR, MACH, KIT CN26 159. RSK-AST: Berichterstattung zur deutschen Rechenkette/Nutzung von Rechencodes12.06.2023Back-up slidesINR, MACH, KIT CN27Multi-user operation in national/regional emergency centres for off-site nuclear emergency managementProvision of information for decision-making• on local / national / regional / European scales,• in the early and later phases of an accident,• for all relevant emergency actions and countermeasures.Wide IT applicability  - HP-UX and Linux (RODOS), Microsoft Windows and Linux (JRODOS)RODOS/JRODOS:Key features of Real-time On-line Decision Support system12.06.2023 159. RSK-AST: Berichterstattung zur deutschen Rechenkette/Nutzung von RechencodesINR, MACH, KIT CN28JRODOS:Hydrological models in (SSK group)12.06.2023Marine food chain and dose model42167 35Freshwater food chain and dose model159. RSK-AST: Berichterstattung zur deutschen Rechenkette/Nutzung von Rechencodes

KIT Computational Route for the Safety Assessment and Radiological Risk Prediction of NPPs

https://publikationen.bibliothek.kit.edu/1000159482/150861718

KIT Computational Route for the Safety Assessment and Radiological Risk Prediction of NPPs

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