The 16th Meeting of the „European MELCOR and MACCS User Group“ EMUG was held in Brno, Czech Republic 7th – 11th April, 2025, and it was organized by the Brno University of Technology and TES in the Czech Republic, in support of the Cooperative Severe Accident Research Programme (CSARP).
Partners of the 16th EMUG 2025 meeting:
The golden partners
The silver partner
The EMUG 2025 conference was held under the auspices of the Ministry of Industry and Trade of The Czech Republic
Presentations:
| Title | Speaker |
| Day 1 | |
| 16th EMUG - WELCOME | MALICKI Mateusz (PSI) |
| Introduction of TES s.r.o. | TES s.r.o. |
| Introduction BUT | prof. Jaroslav Koton, Vice-Dean (BUT) |
| Capabilities of the Czech TSO | Alain Flores y Flores (SURO) |
| Introduction of ÚJV Řež | VÁCHA Petr (UJV Řež) |
| Session 1 CSARP program | |
| U.S. NRC Research Activities on Severe Accident Progression and Source Term Analysis | CAMPBELL Shawn (U.S. NRC) |
| Session 2: SNL introduction | |
| MELCOR Overview | HUMPHRIES Larry (SNL) |
Session 3: SNL updates | |
| CAV/CORQUENCH Update | BEENY Brad (SNL) |
| MELCOR/ORIGEN Update | BEENY Brad (SNL) |
| Fluid Fuel Point Kinetics Update | BEENY Brad (SNL) |
| Fusion I | BEENY Brad (SNL) |
| Fusion II | BEENY Brad (SNL) |
| Application/Demonstration – MSBR and gHPR I | DUCHNOWSKI, Ed (SNL) ONLINE |
| Application/Demonstration – MSBR and gHPR II | DUCHNOWSKI, Ed (SNL) ONLINE |
| Sodium Fire Validation Update (additional presentation) not presented at the meeting | BEENY Brad (SNL) |
Day 2 | |
| Session 4: Users - SA codes experience | |
| Latest Experiences with MELCOR 2.2: An Overview of Applications, Issues and Challenges | GARCIA Monica (Ciemat) |
| Brief MELCOR uncertainty and sensitivity analysis | KOTOUC Miroslav ((UJV Řež)) |
| Stability evaluations application to MAAP benchmarks | BITTAN Jeremy (EDF) |
| Stability techniques applied to SA codes | BAKOUTA Nikolai (EDF) |
| Implementation of Accident Tolerant Fuels in MELCOR: Stability, Performance, and Limitations | HAMŘÍK Lukáš (BUT) |
| Experience from MACCS Applications by the Slovak Regulator | Husarcek Jan (UJD SR) |
| Session 5: MACCS | |
| MACCS: Code Overview, US Regulatory Applications, and Status of Advanced Reactor Readiness. | AJ Nosek (U.S.NRC), Kyle Clavier (SNL) ONLINE |
| Day3 | |
| Session 7: SNL Workshop - Core Degradation, Lower Head/Plenum | |
| Core Degradation, Lower Head/Plenum – I | Larry Humphries (SNL) |
| Core Degradation, Lower Head/Plenum – II | Larry Humphries (SNL) |
| Core Degradation, Lower Head/Plenum – III | Larry Humphries (SNL) |
| Session 8: SNL Workshop - Core Degradation, Lower Head/Plenum | |
| Core Degradation, Lower Head/Plenum – IV | Larry Humphries (SNL) |
| Core Degradation, Lower Head/Plenum – V | Larry Humphries (SNL) |
| Core Degradation, Lower Head/Plenum – VI | Larry Humphries (SNL) |
| Session 9: SNL Workshop – SMR Containment | |
| SMR Containment Models I – HS | BEENY Brad (SNL) |
| SMR Containment Models II – SG, CND, and Rain | BEENY Brad (SNL) |
| SMR Containment Models III – Aerosol Dep/Resusp. | BEENY Brad (SNL) |
Session 10: SNL Workshop – Non-LWR Demo | |
| SMR Containment Models IV – Validation | BEENY Brad (SNL) |
| Third-Party Plug-ins | HASKIN Troy (SNL) ONLINE |
| Guest lecture | |
| ČNS – Expert’s View on MELCOR Code Applicability | Jiří Duspiva (Vice-president of Czech Nuclear Society) |
Day 4 | |
| Session 11: Users – NPP simulations | |
| Simultaneus SFP and open reactor calculations for VVER-1200 | NEMES András (NUBIKI) |
| Experience with MELCOR applications to the VVER-440 reactor equipped with IVR | POKORNÝ Jan (ÚJV Řež a.s.) |
| Analyzing Ex-Vessel Steam Explosions During Severe Accidents in Nordic BWRs | ACHARYA Govatsa (KTH) ONLINE |
Session 12: Users - SMR | |
| Status of SASPAM-SA EU project | MASCARI Fulvio (ENEA) ONLINE |
| Analysis of DBA and different BDBA scenarios in a generic iPWR-type SMR. | CILIA Erik (UNIBO) |
| In-vessel melt retention simulation in iPWR using MELCOR | GIANNETTI Fabio (Sapienza University of Rome) ONLINE |
| LDR Lite district heating reactor benchmark with MELCOR | SEVÓN Tuomo (VTT) |
Day 5 | |
Session 15: Users - fusion | |
| Loss of cryostat vacuum in DEMO fusion reactor due to large ingress of He gas | Leskovar Matjaž (JSI) |
| Emergency draining strategies for lithium systems at the IFMIF-DONES facility | VALVERDE Jaime (Universidad Politécnica de Madrid) |
| Development of an external routine using EDF for fusion modeling needs | GLINGLER Tommaso (Sapienza University of Rome) ONLINE |
Session 16: Users – safety systems | |
| Development of the MELCOR input deck of the PANDA facility – TEMPEST 1.1 experiment | KELK Rainer (PSI) |
| NPP Krsko limiting SBO Accident Radiological consequences | GRGIC Davor (University of Zagreb) ONLINE |
| Hydrogen Distribution and Mitigation Modelling | BRAUN Matthias (Framatome GmbH) |
| I2 scrubbing Simulations with Modified SPARC/MELCOR | RYDL Adolf (INSET) |
| Application of the REPAS methodology with MELCOR code to analyse the reliability of a passive emergency heat removal system | GRIPPO Gianmarco (UNIBO) |
| 16th EMUG conclusion | MALICKI Mateusz (PSI) |
| 17th EMUG announcement | SEVÓN Tuomo (VTT) |