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1. 发明授权

US5202085A Fuel assembly and reactor core 失效
标题翻译：燃料组件和反应堆堆芯
公开(公告)号：US5202085A
公开(公告)日：1993-04-13
申请号：US760964
申请日：1991-09-17
申请人： Motoo Aoyama , Taro Ueki , Akinobu Nakajima , Sadao Uchikawa , Junichi Yamashita
发明人： Motoo Aoyama , Taro Ueki , Akinobu Nakajima , Sadao Uchikawa , Junichi Yamashita
IPC分类号： G21C3/326 , G21C3/328
CPC分类号： G21C3/328 , Y02E30/38
摘要： A fuel assembly has a plurality of first fuel rods and a plurality of second fuel rods having a shorter length in an axial direction than the first fuel rods. The second fuel rod is loaded with natural uranium in full length of its effective fuel length portion. The fuel assembly has a water rod having a larger horizontal cross sectional area at the upper region than the area at the lower region. The second fuel rods are arranged downward of the upper region of the water rod and adjacent to the lower region of the water rod. The width of the horizontal cross sectional area of the lower region of the water rod is set so as to locate the minimum values of both thermal neutron flux and resonance neutron flux in the horizontal direction of the fuel assembly at an outer side with respect the location of the second fuel rod in the horizontal direction. In accordance with the present invention, the H/U ratio in the axial direction becomes close to the optimum value, and increment of the resonance neutron absorption and flattening of the thermal neutron flux in the horizontal direction are achieved.
摘要翻译：燃料组件具有多个第一燃料棒和多个第二燃料棒，其具有比第一燃料棒在轴向上更短的长度。第二个燃料棒在其有效的燃料长度部分的整个长度上装有天然铀。燃料组件具有在上部区域处具有比下部区域的区域更大的水平横截面面积的水杆。第二燃料棒布置在水杆的上部区域的下方并且靠近水杆的下部区域。设置水杆下部区域的水平横截面积的宽度，以将位于燃料组件的水平方向上的热中子通量和共振中子通量的最小值定位在相对于位置的外侧的第二燃料棒在水平方向上。根据本发明，轴向的H / U比变得接近最佳值，并且实现了热中子通量在水平方向上的共振中子吸收和平坦化的增加。

2. 发明授权

US5432829A Fuel assembly and reactor core 失效
标题翻译：燃料组件和反应堆堆芯
公开(公告)号：US5432829A
公开(公告)日：1995-07-11
申请号：US996774
申请日：1992-12-23
申请人： Motoo Aoyama , Taro Ueki , Akinobu Nakajima , Yoko Ishibashi , Kunitoshi Kurihara , Osamu Yokomizo , Yasuhiro Masuhara , Junichi Yamashita , Yasunori Bessho , Junjiro Nakajima
发明人： Motoo Aoyama , Taro Ueki , Akinobu Nakajima , Yoko Ishibashi , Kunitoshi Kurihara , Osamu Yokomizo , Yasuhiro Masuhara , Junichi Yamashita , Yasunori Bessho , Junjiro Nakajima
IPC分类号： G21C3/326 , G21C3/328 , G21C3/32
CPC分类号： G21C3/328 , G21Y2002/201 , G21Y2004/30 , Y02E30/38
摘要： A fuel assembly comprises fuel rods arrayed in a square lattice pattern of 10 rows and 10 columns, and three large-diameter water rods arranged along a diagonal line of the fuel assembly in such a region as able to accommodate 10 fuel rods. Partial length fuel rods are arranged in an outermost layer of the fuel rod array at fuel rod setting positions other than corners of the outermost layer. Ordinary fuel rods are arranged in a layer inside the outermost layer and adjacent to the outermost layer at positions adjacent to the partial length fuel rods in the outermost layer.The struction of the fuel assembly enables a reduction in the void coefficient and an improvement in the reactivity control capability. Also, the void coefficient can be reduced without lowering reactivity, and fuel economy is improved.
摘要翻译：燃料组件包括排列成10行10列的正方形格子图案的燃料棒和沿着能够容纳10个燃料棒的区域沿着燃料组件的对角线布置的三个大直径水棒。部分长度的燃料棒布置在燃料棒阵列的最外层的燃料棒设置位置，而不是最外层的角。普通燃料棒布置在最外层内的层中，并且与最外层中的部分长度燃料棒相邻的位置处邻近最外层。燃料组件的结构能够减小空隙系数并提高反应性控制能力。而且，可以降低空隙系数而不降低反应性，并且提高燃料经济性。

3. 发明授权

US5192496A Fuel assembly and upper tie plate thereof 失效
标题翻译：燃油组件及其上板
公开(公告)号：US5192496A
公开(公告)日：1993-03-09
申请号：US724168
申请日：1991-07-01
申请人： Hideo Soneda , Junichi Yamashita , Yukihisa Fukasawa , Taro Ueki , Sadayuki Izutsu
发明人： Hideo Soneda , Junichi Yamashita , Yukihisa Fukasawa , Taro Ueki , Sadayuki Izutsu
IPC分类号： G21C3/33 , G21C3/322 , G21C3/326 , G21C3/328
CPC分类号： G21C3/322 , G21C3/326 , Y02E30/38
摘要： The fuel assembly has fuel arrangement of a square lattice of 10 lines by 10 rows. Four water rods having a large diameter are arranged in central region of horizontal cross section wherein arrangement of 12 fuel rods is possible. The four water rods having a large diameter are so arranged adjacently in a circle as to form an internal between each other. First coolant flow path which is extended toward axial direction is formed by surrounded with the water rods having a large diameter. The first coolant flow path leads to third coolant flow path which is formed around the fuel rods through second coolant flow path which is the interval between the water rods having a large diameter.The fuel assembly is able to optimize the moderator to fuel atom number density ratio and to reduce the pressure loss because a portion to be an excessively moderated region is utilized as the first coolant flow path.
摘要翻译：燃料组件具有10行×10行的正方格子的燃料排列。具有大直径的四个水杆布置在水平横截面的中心区域，其中12个燃料棒的布置是可能的。具有大直径的四个水杆被以相邻的方式排列成彼此形成内部。朝向轴向方向延伸的第一冷却剂流动路径由具有大直径的水棒包围而形成。第一冷却剂流动路径通向第二冷却剂流动路径，该第三冷却剂流动路径通过作为具有大直径的水棒之间的间隔的第二冷却剂流动路径形成在燃料棒周围。燃料组件能够将减速器优化为燃料原子数密度比，并且由于将过度缓和区域的部分用作第一冷却剂流动路径，所以能够减小压力损失。

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