| 摘要 |
PROBLEM TO BE SOLVED: To improve hydrogen absorption resistance and corrosion resistance under an environment in which hydrogen is injected into reactor water by arranging an excellently hydrogen absorption resistant material in at least a part of a one-phase area of a liquid phase consisting of high temperature water environment on the member surface and arranging an excellently corrosion resistant material in the other place. SOLUTION: In a fuel assembly used for a boiling water reactor, for example, in which hydrogen is injected into reactor water for the purpose of reducing corrosion, a Zr-Nb alloy is used as an especially excellent hydrogen absorption resistant material while a zircaloy alloy is used as an especially excellent corrosion resistant material. For example, a Zr-Nb alloy or the like is used for a spacer 2 arranged in a one-phase area of liquid phase consisting of high temperature water and for a member 6 securing a water flow passage, while a zircaloy alloy or the like is used for a spacer 2 arranged in a two-phase area constructed of a liquid phase consisting of high temperature water and a gas phase, a fuel rod 1, and a channel box 5. In an area having no temperature distribution in the member, an excellently hydrogen absorption resistant material is arranged.
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