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The molten salt reactor (MSR), as one of the candidate reactors of Generation Ⅳ International Forum (GIF), offers significant advantages. The flow effects of the liquid fuel molten salt reactor introduce distinctive differences in both the theoretical models and solution methods compared to legacy reactors. In this study, a neutronics and thermal–hydraulics coupling analysis is conducted for the advanced molten salt reactor concept, MOSART, using the multi-physics coupling code GeN-FOAM. The transport effects of the fuel salt on delayed neutron precursor (DNP) are also considered. Specifically, this paper first presents a steady-state coupling calculation for MOSART and examines the influence of fuel salt residence time outside the reactor. Then, the transient characteristics of MOSART under a reactivity insertion accident are investigated, focusing on the distribution response of DNP with different lifetimes. This study holds broad significance for analysing MSRs and lays the groundwork for future work on structural optimization design and full-loop coupling calculations.

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Study on Neutronic and Thermal–Hydraulic Coupling of a Molten Salt Reactor Based on GeN-FOAM

  • 会议论文

  • 发表日期：

    2026年

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  • W. Wu,
  • D. Zhang,
  • X. Zhou,
  • W. Tian,
  • S. Qiu,
  • G. Su

摘要

The molten salt reactor (MSR), as one of the candidate reactors of Generation Ⅳ International Forum (GIF), offers significant advantages. The flow effects of the liquid fuel molten salt reactor introduce distinctive differences in both the theoretical models and solution methods compared to legacy reactors. In this study, a neutronics and thermal–hydraulics coupling analysis is conducted for the advanced molten salt reactor concept, MOSART, using the multi-physics coupling code GeN-FOAM. The transport effects of the fuel salt on delayed neutron precursor (DNP) are also considered. Specifically, this paper first presents a steady-state coupling calculation for MOSART and examines the influence of fuel salt residence time outside the reactor. Then, the transient characteristics of MOSART under a reactivity insertion accident are investigated, focusing on the distribution response of DNP with different lifetimes. This study holds broad significance for analysing MSRs and lays the groundwork for future work on structural optimization design and full-loop coupling calculations.