公开(公告)号：US06445759B1

公开(公告)日：2002-09-03

申请号：US09689789

申请日：2000-10-13

申请人： Kouji Hiraiwa ,  Yamato Hayashi ,  Yasushi Hirano ,  Jun Saeki ,  Kazuki Hida ,  Junko Watanabe

发明人： Kouji Hiraiwa ,  Yamato Hayashi ,  Yasushi Hirano ,  Jun Saeki ,  Kazuki Hida ,  Junko Watanabe

IPC分类号： G21C300

CPC分类号： G21C7/04 ,  G21C3/326 ,  G21Y2002/201 ,  G21Y2004/10 ,  G21Y2004/30 ,  Y02E30/38 ,  Y02E30/39

摘要： A fuel assembly comprises a plurality of fuel rods bundled in grid pattern, a part of the fuel rods containing gadolinium as a burnable poison. At least one of the fuel rod having gadolinium contains gadolinium enriched in at least one kind of isotope of odd mass number more than an isotopic abundance of natural gadolinium. In the enriched gadolinium, a ratio of a content of Gd-155 to that of Gd-157 is 0.1 or less. An average concentration (wt %) G0 of enriched gadolinia is, with M denoting the number of month under rated power operation per one cycle of an equilibrium core, P power density of a nuclear reactor (kw/l unit) and W a sum of isotopic composition, is set in the range shown by the following expression. G0

摘要翻译： 燃料组件包括多个以栅格图案捆扎的燃料棒，燃料棒的一部分包含钆作为可燃毒物。 具有钆的燃料棒中的至少一个含有富含至少一种比天然钆的同位素丰度高的奇数质量的至少一种同位素的钆。 在富集的钆中，Gd-155与Gd-157的含有率为0.1以下。 富氧钆的平均浓度（wt％）G0，M表示平衡核心每一个循环的额定功率运行下的月数，核反应堆的功率密度（kw / l单位）和W是 同位素组成设定在由下式表示的范围内。因此，在燃料组件中，可以减少循环端的可燃毒物的残留反应性，并且可以提高热性能。在燃料组件的另一方面，a 设置在控制杆侧的区域中的钆氧燃料棒包含富含奇数质量数超过天然同位素丰度的同位素的钆。 富集钆的浓度设定为例如天然钆的一半以下。 因此，氧化钆燃料棒中的易裂变材料（铀）的富集可以大于现有的燃料组件中的裂变材料（铀）的浓缩，钚的平均浓度增加。

公开(公告)号：US5524033A

公开(公告)日：1996-06-04

申请号：US245667

申请日：1994-05-18

申请人： Kazuki Hida ,  Tadashi Ikehara ,  Koichi Nittoh

发明人： Kazuki Hida ,  Tadashi Ikehara ,  Koichi Nittoh

IPC分类号： G21C3/30 ,  G21C3/328 ,  G21C7/04 ,  G21C3/00

CPC分类号： G21C3/328 ,  G21C7/04 ,  G21Y2002/201 ,  G21Y2004/10 ,  Y02E30/38 ,  Y02E30/39

摘要： Gadolinium is provided which is adapted for nuclear fuel as a burnable poison, having a plurality of isotopes in an isotopic composition such that the content of at least one even mass numbered isotope is smaller than the content of the same isotope in natural gadolinium. A fuel assembly is also provided having a plurality of nuclear fuel rods arrayed as a lattice in which at least one of the fuel rods contains the gadolinium burnable poison of the present invention. Also, a fuel assembly is described which has a plurality of nuclear fuel rods arrayed as a lattice which includes at least a first group and a second group of nuclear fuel rods containing gadolinium. The content of Gd-157 in the gadolinium is larger than that found in natural gadolinium. Further, the gadolinium concentrations in the first and second groups are different from each other.

摘要翻译： 提供了适用于核燃料作为可燃毒物的钆，其具有同位素组合物中的多个同位素，使得至少一个偶数质谱号同位素的含量小于天然钆中同一同位素的含量。 还提供一种燃料组件，其具有排列为格子的多个核燃料棒，其中至少一个燃料棒包含本发明的钆可燃毒物。 另外，描述了一种燃料组件，其具有排列成格子的多个核燃料棒，其包括至少第一组和第二组含有钆的核燃料棒。 Gd-157在钆中的含量大于天然钆中的含量。 此外，第一组和第二组中的钆浓度彼此不同。

公开(公告)号：US5416813A

公开(公告)日：1995-05-16

申请号：US142052

申请日：1993-10-28

申请人： Kouji Hiraiwa ,  Yoshihira Ando ,  Koji Hirukawa ,  Kazuki Hida

发明人： Kouji Hiraiwa ,  Yoshihira Ando ,  Koji Hirukawa ,  Kazuki Hida

IPC分类号： G21C3/326 ,  G21C3/00

CPC分类号： G21C3/326 ,  G21Y2002/201 ,  G21Y2004/30 ,  Y02E30/38

摘要： A moderator rod provided with a burnable poison and disposed in a fuel assembly of a reactor core comprises an outer tube, an inner tube disposed in the outer tube, the outer and inner tubes constituting a double tube structure between which an annular section is formed, and a burnable poison charged in said annular section. A containing amount of the burnable poison per unit area of the annular section is distributed at least one of peripheral direction and axial direction of the double tube structure of the inner and outer tubes. A fuel assembly of a nuclear reactor comprises an upper tie plate, a lower tie plate, a number of fuel rods supported at their upper ends by the upper tie plate and at their lower ends by the lower tie plate and filled up in their inner spaces with a plurality of fuel pellets, at least one of moderator rods containing burnable poison in various states and a channel box. The moderator has an outer tube and an inner tube disposed coaxially in the outer tube. An area of a metal, ceramics or thermet containing the burnable poison is formed at a portion except for portions having axial length corresponding to 1/24 to 1/12 length of the fuel effective length from the upper and lower ends thereof.

摘要翻译： 设置有可燃毒物的调节杆，设置在反应堆堆芯的燃料组件中，包括外管，设置在外管中的内管，外管和内管构成双管结构，在其间形成有环形部， 以及在所述环形部分中装入的可燃毒物。 环状部的每单位面积的可燃性毒物的含量分布在内管和外管的双管结构的周向和轴向方向中的至少一个上。 核反应堆的燃料组件包括上连接板，下连接板，多个燃料棒，其上端由上连接板支撑，其下端由下连接板支撑并填充在其内部空间 多个燃料粒子，至少一个包含各种状态的可燃毒物的调节杆和通道箱。 调节剂具有外管和同轴地设置在外管中的内管。 除了具有与其上端和下端的燃料有效长度的1/24至1/12长度相对应的轴向长度的部分之外的部分，形成含有可燃毒物的金属，陶瓷或热电偶的区域。

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。