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LmfbrLMFBR (Liquid Metal Fast Breeder Reactor) is a type of nuclear reactor that uses liquid sodium as its coolant and Uranium-238 to absorb neutrons, which in turn will breed Plutonium-239, an element which can be used in nuclear fissions. U-238 does not produce a nuclear fission, so it is not used as the primary fuel source. If it absorbs a stray neutron from the nuclear fission, it will simply absorb it, which is why it is not used in other types of reactors. But it will decay to Pu-239 which is fissile. This is the primary fuel source in LMFBR. An example of this would be the "Super-Phonix" reactor in France. This type of reactor was banned in the United States up until recently, for the fear that the Plutonium that was created from the reactor could be used in a nuclear bomb (it was of very high purity.) Although the ban has been lifted, no LMFBR have been built in the United States.
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