Multiphysics simulations of Self-Regulating performance of an optimized molten metal fuel microreactor design

•Established Multiphysics models for a molten metal fuel heat-pipe microreactor.•Calculated the steady state neutronics and thermal behavior of the microreactor.•Demonstrated microreactor’s self-regulating feature under transient conditions.•Evaluated the heat-pipe cascade failure when the microreactor is overpowered.