Flibe Energy in the USA is studying a 40 MW two-fluid graphite-moderated thermal reactor concept based on the 1970s MSRE. I
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The Liquid Fluoride Thorium Reactor is a type of Molten Salt Reactor. Molten Salt Reactors are Generation IV nuclear fission reactors that use molten salt as either the primary reactor coolant or as the fuel itself; they trace their origin to a series of experiments directed by Alvin Weinberg at Oak Ridge National Laboratory in the ‘50s and ‘60s. The LFTR is differentiated from other variants of the MSR by the fact that it runs on thorium rather than uranium, thorium being an element that is fertile rather than fissile, and which will transmute to fissile uranium-233 upon exposure to neutrons.