NUCLEAR FUEL COMPOSITION, ATOMIC REACTOR AND METHOD FOR SETTING NUCLEAR FUEL IN SPECIFIC SUBCRITICA

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PROBLEM TO BE SOLVED : To provide a nuclear fuel composition for setting nuclear fuel in a specific subcritical state. SOLUTION : Nuclear fuel 20 includes a nuclear fission material 22 and a neutron absorbing material 24 adjacent to the nuclear fission material. The neutron absorbing material includes samarium. The nuclear fuel composition is used in an atomic reactor such as a thermal neutron reactor. For example, the neutron absorbing material includes 25 wt.% to 75 wt.% of samarium and residual rare earth elements. The rare earth elements are gadolinium. COPYRIGHT : (C)2012, JPO&INPIT