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A liquid metal cooled nuclear reactor, liquid metal fast reactor or LMFR is an advanced type of nuclear reactor where the primary coolant is a liquid metal. Liquid metal cooled reactors were first adapted for nuclear submarine use but have also been extensively studied for power generation applications. A breeder reactor is a nuclear reactor that creates more fissile material than it consumes. It requires an initial charge of fissile material, such as highly enriched uranium or plutonium, and a supply of fertile material, such as natural uranium, depleted uranium or thorium. Excess neutrons generated in the fission reaction are absorbed by the fertile isotope, which is transmuted to a fissile isotope. As of 2006, all large-scale fast breeder reactor (FBR) power stations have been liquid metal fast breeder reactors (LMFBR) cooled by liquid sodium. When it comes to fast breeder reactors, molten sodium is the coolant of choice because it causes negligible moderation. Not only one of the cheapest available metals, liquid sodium is further advantageous because it carries a high power density and is non-corrosive to stainless steel.