Fast Breeder Reactor (FBR)

A Fast Breeder Reactor (FBR) is a type of nuclear reactor that generates more fissile material than it consumes. It uses fast neutrons, without a moderator, to sustain the chain reaction and converts non-fissile material like uranium-238 into more usable fuel such as plutonium-239. This process "breeds" fuel, making FBRs efficient in utilizing nuclear resources and reducing nuclear waste. They are considered advanced reactors with the potential to extend uranium supplies and improve nuclear sustainability, though they require complex technology and safety measures.