'Medium' size

Electric output of between 100 MWe and 200 MWe

Molten high-temperature salt reactor

Various salts usable, often fluorides or eutectic mixtures

'Micro' size

Electric output of less than 10 MWe

Mixed-nitride (nuclear fuel)

Fuel made from a mix of uranium and plutonium nitrides

Molten salt reactor

Primary heat transport: molten salt - often F compounds

Mixed-oxide (nuclear fuel)

Fuel made from a mix of uranium and plutonium oxides

Mixed-oxide (nuclear fuel)

Fuel made from a mix of uranium and plutonium oxides

Molten salt fast reactor

Various salts usable, often fluorides or eutectic mixtures