A molten salt reactor (MSR) is a type of nuclear fission reactor in which the primary coolant is a molten salt mixture, which can run at high temperatures (for higher thermodynamic efficiency) while staying at low vapor pressure for reduced mechanical stress and increased safety, and is less reactive than molten sodium coolant.
The nuclear fuel may be solid fuel rods, or dissolved in the coolant itself, which eliminates fuel fabrication, simplifies reactor structure, equalizes burnup, and allows online reprocessing. One kind of proposed MSR is a liquid fluoride thorium reactor (LFTR). Thorium is a naturally occurring radioactive chemical element estimated to be about three to four times more abundant than uranium in the Earth’s crust.
The Daily Omnivore 
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