What are molten salt reactors?

A molten salt (low-pressure) reactor uses uranium dissolved in a molten fluoride salt liquid mixture to generate heat through a controlled nuclear fission chain reaction in the core. The molten salt acts as a coolant and a moderator, sustaining the chain reaction. The heat is transferred to a working fluid. This heat can then be used for conversion to electrical power or direct thermal energy for heating purposes. Molten salt reactors are fuelled for life; therefore, no bunkering is required.