BOILING WATER REACTOR

To improve channel box (fuel assembly) supporting performance.SOLUTION: A boiling water reactor 11 comprises square cylinder-shaped channel boxes 22 disposed to surround side faces of respective fuel assemblies 20, and a disk-like grid plate 17 supporting upper side faces of the channel boxes. The g...

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Hauptverfasser:	OTAKI KENTO, AKAIKE MASANORI, KIKUCHI YOSHIHARU, MIURA HIROKI, SETO TAKEHIRO, UCHIYAMA KOJI, KUROITA SHO, YOSHIDA KEITA
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	NUCLEAR ENGINEERING NUCLEAR PHYSICS NUCLEAR REACTORS PHYSICS
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Zusammenfassung:	To improve channel box (fuel assembly) supporting performance.SOLUTION: A boiling water reactor 11 comprises square cylinder-shaped channel boxes 22 disposed to surround side faces of respective fuel assemblies 20, and a disk-like grid plate 17 supporting upper side faces of the channel boxes. The grid plate 17 is shaped such that an outer peripheral portion over an entire circumference or part thereof is higher than an inner peripheral portion 30 provided with multiple holes 33 for allowing upper portions of the channel boxes 22 to be inserted.SELECTED DRAWING: Figure 5 【課題】チャンネルボックス（燃料集合体）の支持性能（サポート性能）を向上させる。【解決手段】沸騰水型原子炉１１は、燃料集合体２０の側面を囲むように配置された四角筒状のチャンネルボックス２２と、チャンネルボックスの側面上部を支持する円板状の格子板１７と、を備えている。格子板１７は、チャンネルボックス２２の上部が挿入される複数の孔３３が設けられた内周部３０に対し、外周部の全周又は一部の上面の高さが高い。【選択図】図５