TY - GEN
T1 - MYRRHA Fast Reactor Am-Bearing Fuel Pins Modelling Using OFFBEAT
AU - Peng, Xinhang
AU - Zhang, Tian
AU - Zhang, Dalin
AU - Tian, Wenxi
AU - Qiu, Suizheng
AU - Su, Guanghui
N1 - Publisher Copyright:
© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2026.
PY - 2026
Y1 - 2026
N2 - Due to Fast Breeding Reactors’ (FBRs) higher power density and burn-up, FBR fuels have higher temperature, higher fission gas release rate, significant fuel and cladding deformation, and the formation of central voids. Therefore, modelling of FBR fuels present new challenges for fuel performance code development. The formation of central voids and the migration of nuclides are the most important phenomena in fast reactor MOX fuel, and correctly simulating the nuclide distribution and pore migration within the fuel pellets is the core issue in fast reactor fuel performance simulation. In this study, OFFBEAT was used to simulate the driver rod in the MYRRHA reactor, considering the effects of different Am content on the fuel rod irradiation behavior. By comparing the simulation results with TRANSURNUS in open literature, models in OFFBEAT for fast reactor simulations are verified and analyzed. Based on the verified model, the linear power of the rod was increased to extend the study of fuel rod irradiation behavior in the MYRRHA reactor at high power level, simulating and analyzing the nuclide redistribution and pore migration phenomena in the fuel. The results indicate that the temperature, gap width, and fission gas release rate in the fuel pellets calculated by OFFBEAT for the MYRRHA reactor are acceptable, with effect of different Am content on fuel behavior. Significant nuclide redistribution and void migration occurred at higher power level. The temperature gradient is the primary factor influencing nuclide redistribution and void migration, and both phenomena tend to transport toward the center of the fuel pellets. Therefore, OFFBEAT meets the simulation requirements for FBRs and the analysis demonstrates the suitability and safety of low Am-enriched MOX fuel under irradiation based on the current MYRRHA design.
AB - Due to Fast Breeding Reactors’ (FBRs) higher power density and burn-up, FBR fuels have higher temperature, higher fission gas release rate, significant fuel and cladding deformation, and the formation of central voids. Therefore, modelling of FBR fuels present new challenges for fuel performance code development. The formation of central voids and the migration of nuclides are the most important phenomena in fast reactor MOX fuel, and correctly simulating the nuclide distribution and pore migration within the fuel pellets is the core issue in fast reactor fuel performance simulation. In this study, OFFBEAT was used to simulate the driver rod in the MYRRHA reactor, considering the effects of different Am content on the fuel rod irradiation behavior. By comparing the simulation results with TRANSURNUS in open literature, models in OFFBEAT for fast reactor simulations are verified and analyzed. Based on the verified model, the linear power of the rod was increased to extend the study of fuel rod irradiation behavior in the MYRRHA reactor at high power level, simulating and analyzing the nuclide redistribution and pore migration phenomena in the fuel. The results indicate that the temperature, gap width, and fission gas release rate in the fuel pellets calculated by OFFBEAT for the MYRRHA reactor are acceptable, with effect of different Am content on fuel behavior. Significant nuclide redistribution and void migration occurred at higher power level. The temperature gradient is the primary factor influencing nuclide redistribution and void migration, and both phenomena tend to transport toward the center of the fuel pellets. Therefore, OFFBEAT meets the simulation requirements for FBRs and the analysis demonstrates the suitability and safety of low Am-enriched MOX fuel under irradiation based on the current MYRRHA design.
KW - Code verification
KW - Fast breeding reactor
KW - Fuel performance analysis
KW - OFFBEAT
UR - https://www.scopus.com/pages/publications/105028884423
U2 - 10.1007/978-981-95-2732-8_12
DO - 10.1007/978-981-95-2732-8_12
M3 - 会议稿件
AN - SCOPUS:105028884423
SN - 9789819527311
T3 - Springer Proceedings in Physics
SP - 133
EP - 147
BT - Proceedings of the 32nd International Conference on Nuclear Engineering—Volume 4; ICONE 2025, Nuclear Fuel and Materials, Transportation and Fuel Cycle, and Reactor Physics II
A2 - Tan, Sichao
A2 - Xu, Weiqiang
A2 - Zhu, Yanyan
PB - Springer Science and Business Media Deutschland GmbH
T2 - 32nd International Conference on Nuclear Engineering, ICONE 2025
Y2 - 22 June 2025 through 26 June 2025
ER -