What are fast breedor reactors?

Fast breeder reactors (FBRs) are a type of nuclear reactor that generate more fissile material than they consume. They achieve this by using fast neutrons to convert non-fissile isotopes, such as uranium-238, into fissile isotopes like plutonium-239. FBRs have the potential to utilize nuclear fuel more efficiently and reduce nuclear waste, making them an important aspect of advanced nuclear technology and sustainable energy strategies. However, they also present challenges in terms of safety, proliferation risk, and cost.