Fast-breeder reactors are a type of nuclear reactor that can produce more fissile material than they consume.

Pebble-bed reactors are a type of nuclear reactor that use spherical fuel elements called pebbles.

Pressurized water reactors are commonly used in nuclear power plants.

A fast-neutron reactor is a type of nuclear reactor that uses high-energy neutrons to sustain the nuclear fission chain reaction.

Fast-neutron reactors are a type of nuclear reactor that use high-energy neutrons to sustain the nuclear chain reaction.