| 摘要 |
PROBLEM TO BE SOLVED: To provide a reactor core for a nuclear reactor unnecessitating a control rod for compensating burn up reactivity and adjusting an output distribution, facilitating an operation, having excellent safety and effectively utilizing natural uranium or deplete uranium. SOLUTION: The reactor core 1 for the nuclear reactor in which natural uranium 15 are regularly arranged as nuclear fuel materials for first loading and a nuclear fission chain reaction is maintained by using fast neutron is provided with a burn up starting means 16 which is provided at a reactor core lower end part or a reactor core upper end part and is composed of a burn up starting part 16 starting burn up due to the nuclear fission chain reaction of a fissile material generated by the natural uranium 15 and a nuclear transformation from the natural uranium 15 and a heat removing means for removing heat energy generated by nuclear fission by the fissile material generated by the natural uranium 15 and the nuclear transformation from the natural uranium 15.
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