BREST (or BREST-OD-300) is a type of nuclear reactor that belongs to the class of lead-cooled fast reactors. It is designed to use liquid lead or lead-bismuth as a coolant, which has several advantages, including a high boiling point and good neutron economy. The BREST reactor is notable for its use of fast neutrons, which allows it to efficiently utilize nuclear fuel, including mixed-oxide (MOX) fuel.
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