公开(公告)号：US4777016A

公开(公告)日：1988-10-11

申请号：US870400

申请日：1986-06-04

申请人： Toshiro Yoshioka ,  Takao Igarashi ,  Takaaki Mochida ,  Michihiro Ozawa

发明人： Toshiro Yoshioka ,  Takao Igarashi ,  Takaaki Mochida ,  Michihiro Ozawa

IPC分类号： G21C3/326 ,  G21C3/322 ,  G21C3/32

CPC分类号： G21C3/322 ,  G21C2003/3225 ,  G21Y2002/201 ,  G21Y2004/30 ,  Y02E30/38 ,  Y10S376/904

摘要： A fuel assembly including a channel box, upper and lower tie plates, fuel rods inserted in the channel box and held at upper and lower end portions by the upper and lower tie plates, a water rod disposed among the fuel rods and spacers for keeping the fuel rods and the water rod spaced from one another. The water rod has a diameter larger than that of each of the fuel rods and the upper end of the water rod has a height substantially as high as an upper end of an effective enriched fuel section of each fuel rod.

摘要翻译： 一种燃料组件，包括通道箱，上下连接板，插入通道箱中的燃料棒，并通过上下连接板保持在上端和下端部，设置在燃料棒和间隔件之间的水杆，用于保持 燃料棒和水杆彼此间隔开。 水杆的直径大于每个燃料棒的直径，并且水杆的上端具有与每个燃料棒的有效富集燃料部分的上端大致相同的高度。

公开(公告)号：US4683113A

公开(公告)日：1987-07-28

申请号：US734604

申请日：1985-05-16

申请人： Takaaki Mochida ,  Junichi Yamashita ,  Toshiro Yoshioka ,  Michihiro Ozawa

发明人： Takaaki Mochida ,  Junichi Yamashita ,  Toshiro Yoshioka ,  Michihiro Ozawa

IPC分类号： G21C3/18 ,  G21C3/328 ,  G21C3/00

CPC分类号： G21C3/18 ,  G21C3/328 ,  Y02E30/38

摘要： A nuclear fuel assembly has a plurality of fuel rods each containing a multiplicity of fuel pellets. The fuel rods include a plurality of first fuel rods and a plurality of second fuel rods. Each of the first fuel rods contains a burnable poison over substantially the entire axial length thereof. The first fuel rod also has a greater means enrichment in the upper axial region thereof than that in the lower axial region thereof. Each of the second fuel rods contains no burnable poison and has a uniform enrichment distribution over substantially the entire axial length thereof. In each cross-section of the fuel assembly perpendicular to the axis thereof, the outer peripheral portion has a greater mean enrichment than the central portion. The first fuel rods are disposed in the peripheral portion except the outermost peripheral portion of the cross-section of the fuel assembly.

摘要翻译： 核燃料组件具有多个燃料棒，每个燃料棒包含多个燃料粒子。 燃料棒包括多个第一燃料棒和多个第二燃料棒。 每个第一燃料棒在其基本上的整个轴向长度上包含可燃的毒物。 第一燃料棒在其上轴向区域中具有比在其下轴向区域更大的装置富集。 每个第二燃料棒不含有可燃毒物并且在其基本上整个轴向长度上具有均匀的富集分布。 在垂直于其轴线的燃料组件的每个横截面中，外周部分具有比中心部分更大的平均富集度。 第一燃料棒设置在除了燃料组件的横截面的最外周部分之外的周边部分中。

公开(公告)号：US5631939A

公开(公告)日：1997-05-20

申请号：US521372

申请日：1995-08-31

申请人： Hiroko Haraguchi ,  Yoshihiri Iwashita ,  Toshiro Yoshioka ,  Junichi Koyama ,  Akihiro Yamanaka ,  Mitsunari Nakamura ,  Katsumasa Haikawa

发明人： Hiroko Haraguchi ,  Yoshihiri Iwashita ,  Toshiro Yoshioka ,  Junichi Koyama ,  Akihiro Yamanaka ,  Mitsunari Nakamura ,  Katsumasa Haikawa

IPC分类号： G21C5/00

CPC分类号： G21C5/00 ,  G21Y2002/201 ,  G21Y2004/30 ,  Y02E30/40

摘要： In an initial core constituted by various kinds of fuel assemblies having a different average enrichment of uranium 235 four fuel assemblies having the lowest average enrichment constitute a square shaped cell. Three fuel assemblies having the highest average enrichment constitute an L-shaped cell, and the L-shaped cell is arranged at corners of the square shaped cells, whereby each assembly of the L-shaped cell adjoins a square shaped cell. The ratio of the number of assemblies of the L-shaped cell to the total number of fuel assemblies in the core is 10% or more.

摘要翻译： 在由具有不同铀235的不同浓度的各种燃料组件构成的初始核心中，具有最低平均浓度的四个燃料组件构成一个正方形的电池。 具有最高平均浓度的三个燃料组件构成L形电池，并且L形电池被布置在方形电池的拐角处，由此L形电池的每个组件邻接正方形电池。 L形电池的组件数与芯中的燃料组件总数之比为10％以上。