BOILING-WATER REACTOR
PROBLEM TO BE SOLVED: To provide a boiling-water reactor provided with: densely arranged hexagonal columnar fuel assemblies; and Y-shaped control rods inserted among three fuel assemblies arranged adjacently to one another, and capable of smoothly carrying out initial fuel loading work and fuel exch...
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| Zusammenfassung: | PROBLEM TO BE SOLVED: To provide a boiling-water reactor provided with: densely arranged hexagonal columnar fuel assemblies; and Y-shaped control rods inserted among three fuel assemblies arranged adjacently to one another, and capable of smoothly carrying out initial fuel loading work and fuel exchanging work by preventing interference of the fuel assemblies and the Y-shaped control rods with each other.SOLUTION: The boiling-water reactor is provided with: densely arranged hexagonal columnar fuel assemblies 14; and Y-shaped control rods 15 inserted among three fuel assemblies 14 arranged adjacently to one another. This boiling-water reactor has vertical guides 24 that vertically extend among the three fuel assemblies 14 and on each horizontal extensions of three blades constituting the Y-shaped control rods 15, and have widths T1 larger than thicknesses T2 of the blades of the Y-shaped control rods.SELECTED DRAWING: Figure 6
【課題】稠密に配置された六角柱形状の燃料集合体と、互いに隣接した３体の燃料集合体の間に挿入されるＹ字型制御棒とを備えた沸騰水型原子炉において、燃料集合体とＹ字型制御棒との干渉を防止することにより、燃料初装荷作業又は燃料交換作業を円滑に行うことを可能とした沸騰水型原子炉を提供する。【解決手段】稠密に配置された六角柱形状の燃料集合体１４と、互いに隣接した３体の燃料集合体１４の間に挿入されるＹ字型制御棒１５とを備えた沸騰水型原子炉において、前記３体の燃料集合体１４の間でかつ前記Ｙ字型制御棒１５を構成する３枚の翼のそれぞれの水平方向延長上に鉛直方向に延び、前記Ｙ字型制御棒の翼の厚さＴ２よりも大きな幅Ｔ１を有する鉛直ガイド２４を設置する。【選択図】図６ |
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