| 摘要 |
PROBLEM TO BE SOLVED: To provide a boiling water reactor that can be loaded with fuel assemblies having a plurality of reactivity characteristics without increasing the kinds of fuel pellet and fuel rods. SOLUTION: This core has fuel assemblies which have fuel rods formed by loading uranium fuel or MOX fuel mixed with uranium fuel and plutonium fuel in cladding tubes, and fuel rods containing burnable poison formed by loading in cladding tubes fuel containing burnable poison in which burnable poison containing gadolinia is mixed, and stores the fuel rods and the fuel rods containing the burnable poison, in a channel box. The fuel assemblies are combined and loaded to have three or more kinds of adjacent index values of the fuel rods containing burnable poison, which are defined by the number of fuel rods containing burnable poison adjacently arranged to make the shortest the adjacent index values of fuel rods containing burnable poison = the distance between the fuel rods of the object fuel assembly/the number of all the fuel rods containing burnable poison of the object fuel assembly. COPYRIGHT: (C)2009,JPO&INPIT
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