Fast Breeder Reactor (FBR)

The principal reactor cooling system design of a FBR is similar to a PWR. The major difference is that the coolant in a FBR is liquid sodium instead of water. there are 2 sodium circuits, where heat transfer is generated by a heat exchanger. The secondary sodium circuit transfer the heat to a steam generator.

FBRs have been designed not only to produce electricity, but also to generate (breed) fuel, namely plutonium out of uranium.

The FBR fuel is plutonium which needs fast neutrons to generate fission, therefore water cannot be used as a coolant, because of its moderating function.

FBRs are designed for on-load refuelling.