Abstract

Recent interest in molten salt reactors (MSRs) has initiated research projects on their safety and performance compared to light water reactors. Maintaining the fuel salt in a molten state during reactor operation at all power levels is a significant safety concern for these reactors. Various strategies can be used to maintain the fuel salt temperature above its melting point during low-power reactor operation. This study analyzed the impact of using electric heaters on the stability and performance of an operating MSR. For this purpose, a simulation tool was developed for reactor dynamics and stability analysis studies. The simulation tool was validated against the Molten Salt Reactor Experiment reactivity insertion tests. The dynamics of an MSR with and without operating electric heaters at steady state and following initiated transients were investigated and compared. Simulation results showed that the usage of these heaters is more pronounced during transients rather than in the steady-state operation. The stability of the system degraded following transients due to the operation of heaters. However, using heaters remains an alternative strategy to maintain fuel salt molten at low power levels.

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