| 摘要 |
A fuel assembly for use in a boiling water reactor has a multiplicity of fuel rods. In the fuel assembly, among the fuel rods located in the periphery (for example, the outermost periphery) of the cross section of the fuel assembly, the proportion of fuel rods whose enrichment in their respective lower regions are greater than the average enrichment in the lower region of the fuel assembly is less than the proportion of fuel rods whose enrichment in their respective upper regions are greater than the average enrichment in the upper region of the fuel assembly.
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