| 摘要 |
PROBLEM TO BE SOLVED: To suppress increase in the manufacturing cost of a reactor core fuel and at the same time, improve the average degree of combustion for taking out the reactor core fuel. SOLUTION: In the homogeneous reactor core of a fast reactor where an inner reactor core region 12 and an outer reactor core region 14 are composed of two types of MOX (a mixed oxide of uranium and plutonium) reactor core fuels with different degree of Pu enrichment and the degree of Pu enrichment of the outer reactor core region 14 is increased as compared with the degree of Pu enrichment of the inner reactor region 12, a fuel assembly where an MOX fuel element and an oxidation loss uranium fuel element coexist is loaded for providing a reactor core central region 10 at the central part of the inner reactor core region 12, thus constituting the reactor core of a fast reactor where the average degree of Pu enrichment of the fuel assembly gradually increases in the order of the reactor core central region 10, the inner reactor core region 12, and the outer reactor core region 14. In terms of the manufacturing cost of the reactor core fuel, the degree of Pu enrichment of an MOX fuel element that is used by the fuel assembly being loaded into the reactor core central region 10 should be preferably identical to the degree of Pu enrichment of the MOX fuel element being used by the fuel assembly being loaded into regions.
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