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11. 发明授权

US5367547A Fuel assembly for boiling water reactor and core 失效
标题翻译：用于沸水反应堆和核心的燃料组件
公开(公告)号：US5367547A
公开(公告)日：1994-11-22
申请号：US79527
申请日：1993-06-22
申请人： Kazuki Hida , Yasushi Hirano , Koji Hirukawa , Tsuyoshi Nakajima
发明人： Kazuki Hida , Yasushi Hirano , Koji Hirukawa , Tsuyoshi Nakajima
IPC分类号： G21C3/328 , G21C3/32
CPC分类号： G21C3/328 , G21Y2002/201 , G21Y2004/30 , Y02E30/31 , Y02E30/38
摘要： A fuel assembly for a boiling water reactor comprising an upper and lower tie plates, a plurality of fuel rods filled therein with a plurality of fuel pellets, a fuel bundle comprising the fuel rods retained with a plurality of spacers in spaced relation and disposed between the upper and lower tie plates, and a polygonal tube-like channel box which encloses the fuel bundle and constitutes flow paths for coolant. The fuel rods comprise long fuel rods and short fuel rods which are each shorter in the effective portion than each of the long fuel rods. The concentration of fissile material in each of the short fuel rods is lower than the mean concentration of fissile material in the cross section of the fuel bundle. In the case the fuel bundle is vertically subdivided into two regions, an upper and lower one, with the upper end of the effective portion of each of the short fuel rods as a border, the mean concentration of fissile material in the cross section of the fuel bundle in the region lower than the border is lower than that in the cross section of the fuel bundle in the region above the border.
摘要翻译：一种用于沸水反应器的燃料组件，包括上和下连接板，多个燃料棒，其中填充有多个燃料颗粒，燃料束，包括燃料棒，所述燃料棒具有间隔开的多个间隔件并且设置在所述燃料棒之间上下连接板和封闭燃料束的多边形管状通道箱，并构成冷却剂的流动路径。燃料棒包括长燃料棒和短燃料棒，其有效部分比每个长燃料棒短。每个短燃料棒中的易裂变材料的浓度低于燃料束截面中易裂变材料的平均浓度。在燃料束垂直分为两个区域的情况下，上，下一个，短燃料棒的有效部分的上端作为边界，在该截面中的裂变材料的平均浓度在低于边界的区域中的燃料束比在边界上方的燃料束的横截面中低。

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