| 摘要 |
PROBLEM TO BE SOLVED: To combine effective use of recovered uranium with enhancement of safety at a cold temperature, without lowering an average enrichment of a fuel assembly, by using the recovered uranium obtained by reprocessing of spent nuclear fuel. SOLUTION: In this fuel assembly for a boiling water reactor, a fuel rod group filled with fuel pellets comprising a nuclear fuel material is arranged regularly as a square lattice array, a large-diametric water rod of a non-boiling area occupying an area corresponding to a plurality of fuel rods is provided in the substantially central position of the square lattice array, and the recovered uranium obtained by the reprocessing of the spent nuclear fuel is contained in one portion of the fuel pellet. When an axis-directional fuel effective area is partitioned into an upper area and a lower area in a position of about 2/3 position from its lower end, the number of the recovered uranium fuel rods in one cross-section in the upper area is larger than the number of the recovered uranium fuel rods in one cross-section in the other area. COPYRIGHT: (C)2004,JPO
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