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1. 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。

2. 发明授权

US5383229A 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：US5383229A
公开(公告)日：1995-01-17
申请号：US879
申请日：1993-01-05
申请人： Akinobu Nakajima , Yoko Ishibashi , Motoo Aoyama , Kunitoshi Kurihara , Junichi Yamashita , Junjiro Nakajima , Koji Nishida
发明人： Akinobu Nakajima , Yoko Ishibashi , Motoo Aoyama , Kunitoshi Kurihara , Junichi Yamashita , Junjiro Nakajima , Koji Nishida
IPC分类号： G21C3/328 , G21C3/32
CPC分类号： G21C3/328 , G21Y2002/201 , G21Y2004/30 , Y02E30/38
摘要： A second fuel rod positioned at each corner of a channel box and second fuel rods adjacent to the former are formed to have a smaller outer diameter than that of ordinary first fuel rods, so that a pitch between the second fuel rods is narrower than a pitch between the first fuel rods. Making the outer diameter of the second fuel rods smaller than that of the first fuel rods reduces the power per unit length of the second fuel rods. The narrower pitch between the second fuel rods than the pitch between the first fuel rods provides two effects. First, a unit lattice cell becomes so small as to avoid an increase in the H/U ratio. Secondly, a new moderator region is formed between the second fuel rods and the first fuel rods adjacent thereto, the moderator region acting to intensify thermal neutron flux around those first fuel rods. These two effects enable a further reduction in the power per unit length of the second fuel rods. As a result, a fuel assembly intended for higher burn-up can be realized by increasing enrichment, while suppressing an increase in the local power peaking factor at corners of the fuel assembly.
摘要翻译：定位在通道箱的每个角落处的第二燃料棒和与前者相邻的第二燃料棒形成为具有比普通的第一燃料棒小的外径，使得第二燃料棒之间的间距比间距窄在第一燃料棒之间。使得第二燃料棒的外径小于第一燃料棒的外径减小了第二燃料棒的每单位长度的功率。第二燃料棒之间的间距窄于第一燃料棒之间的间距，提供了两个效果。首先，单位晶胞变得如此小以避免H / U比的增加。其次，在第二燃料棒和与其相邻的第一燃料棒之间形成新的慢化剂区域，该慢化剂区域用于加强围绕这些第一燃料棒的热中子通量。这两个效果使得能够进一步降低第二燃料棒的每单位长度的功率。结果，可以通过增加浓缩来实现用于更高燃耗的燃料组件，同时抑制燃料组件的角落处的局部功率峰值因数的增加。

3. 发明授权

US5388132A Nuclear fuel assembly and core 失效
标题翻译：核燃料组件和核心
公开(公告)号：US5388132A
公开(公告)日：1995-02-07
申请号：US121898
申请日：1993-09-16
申请人： Motoo Aoyama , Yasunori Bessho , Junichi Yamashita , Katsumasa Haikawa , Hajime Umehara , Osamu Yokomizo , Hideo Soneda , Mitsunari Nakamura
发明人： Motoo Aoyama , Yasunori Bessho , Junichi Yamashita , Katsumasa Haikawa , Hajime Umehara , Osamu Yokomizo , Hideo Soneda , Mitsunari Nakamura
IPC分类号： G21C3/328 , G21C3/62
CPC分类号： G21C3/328 , G21Y2002/201 , G21Y2004/10 , G21Y2004/30 , Y02E30/31 , Y02E30/38
摘要： A mean uranium enrichment of fuel rods is set to not less than 4 wt% and preferably 4.25%, a percentage in number of Gd rods to all the fuel rods is set in the range of 20 to 30% and preferably 23%, and an enrichment 4.45 wt% of the Gd rods is between a pellet maximum uranium enrichment and a pellet minimum uranium enrichment. A percentage in number of those fuel rods having a maximum uranium enrichment of 5.0% to all the fuel rods except the Gd rods is set to not less than 75% and preferably 82%. A mean uranium enrichment in the enriched fuel section except blanket regions at upper and lower end portions is 4.75 wt% and a ratio e.sub.max /e.sub.mean of the pellet maximum uranium enrichment to that mean uranium enrichment is not larger than 1.16 and preferably 1.105. Accordingly, when the maximum uranium enrichment is limited to 5.0 wt%, the mean uranium enrichment can be raised to attain mean discharged exposure not less than 45 GWd/t without causing any problems in gadolinia containing fuel rods.
摘要翻译：将燃料棒的平均铀浓缩设定为不低于4重量％，优选为4.25％，将所有燃料棒的Gd棒的数量设定在20〜30％，优选为23％的范围内，富集4.45重量％的Gd棒是在颗粒最大铀浓缩和沉淀最小铀浓缩之间。对除了Gd棒以外的所有燃料棒，具有5.0％的最大铀浓缩的燃料棒的数量的百分比设定为75％以上，优选为82％。富集燃料部分的平均铀浓缩除上下部分的覆盖区域为4.75重量％，并且颗粒最大铀浓缩与该平均铀浓缩物的比例emax / emean不大于1.16，优选为1.105。因此，当最大铀浓缩限制为5.0重量％时，可以提高平均铀浓缩以达到不低于45GWd / t的平均排放暴露，而不会在含钆燃料棒中引起任何问题。

4. 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。

5. 发明授权

US5207979A Nuclear fuel assemblies and reactor cores including them 失效
标题翻译：核燃料组件和反应堆核心，包括它们
公开(公告)号：US5207979A
公开(公告)日：1993-05-04
申请号：US496309
申请日：1990-03-20
申请人： Junichi Koyama , Motoo Aoyama , Akinobu Nakajima , Yasunori Bessho , Junichi Yamashita , Sadao Uchikawa , Hiromi Maruyama , Michihiro Ozawa , Mitsunari Nakamura
发明人： Junichi Koyama , Motoo Aoyama , Akinobu Nakajima , Yasunori Bessho , Junichi Yamashita , Sadao Uchikawa , Hiromi Maruyama , Michihiro Ozawa , Mitsunari Nakamura
IPC分类号： G21C3/326
CPC分类号： G21C3/326 , G21Y2002/201 , G21Y2004/30 , Y02E30/38
摘要： A nuclear fuel assembly has an array of fuel rods comprising a plurality of first fuel rods each containing nuclear fuel material but not containing burnable poison and a plurality of further fuel rods each containing both nuclear fuel material and burnable poison. The further fuel rods comprise second fuel rods and third fuel rods, and each second fuel rod has at a lower region of the fuel assembly a burnable poison concentration which is a minimum burnable poison concentration in the further fuel rods. To increase the effectiveness of the second fuel rods in controlling axial power peaking, as seen in plan view on the array, the first fuel rods are the nearest neighbors of each further fuel rod.
摘要翻译：核燃料组件具有燃料棒阵列，其包括多个第一燃料棒，每个第一燃料棒包含核燃料材料但不含有可燃毒物，以及多个另外的燃料棒，每个燃料棒同时包含核燃料材料和可燃毒物。另外的燃料棒包括第二燃料棒和第三燃料棒，并且每个第二燃料棒在燃料组件的较低区域处具有在另外的燃料棒中是可燃毒物浓度的可燃毒物浓度。为了提高第二燃料棒在控制轴向功率峰化方面的有效性，如在阵列的平面图中所见，第一燃料棒是每个另外的燃料棒的最邻近的。

6. 发明授权

US5176877A Nuclear fuel assembly and nuclear reactor core containing said assembly 失效
标题翻译：核燃料组件和核反应堆核心含有组装
公开(公告)号：US5176877A
公开(公告)日：1993-01-05
申请号：US584745
申请日：1990-09-19
申请人： Akinobu Nakajima , Yasunori Bessho , Motoo Aoyama , Junichi Koyama , Hiromasa Hirakawa , Junichi Yamashita , Tatsuo Hayashi
发明人： Akinobu Nakajima , Yasunori Bessho , Motoo Aoyama , Junichi Koyama , Hiromasa Hirakawa , Junichi Yamashita , Tatsuo Hayashi
IPC分类号： G21C3/328 , G21C3/326
CPC分类号： G21C3/326 , G21Y2002/201 , G21Y2004/30 , Y02E30/38
摘要： A nuclear fuel assembly for a nuclear reactor has a plurality of vertically extending fuel rods arranged side by side in a square array and containing fissile material. The array has two adjacent first sides which are next to a control rod region of the core and two adjacent second sides which are next to a non-control rod region of the core. When the rods of the array as seen in horizontal cross section, excluding the rods lying on the diagonal line joining the opposite corners of the array at which the control rod region meets the non-control rod region, is divided into four regions which area: the rods in the row and column of said array adjoining said first sides;b: the rods lying between said region a and said diagonal line;c: the rods lying between said region d and said diagonal line,d: the rods in the row and column of said array adjoining said second sides and; over at east part of the height containing fissile material, the average concentration of fissile material per fuel rod is higher in said region b than said region c and by at least 5% and, among all said regions a, b, c, d, is a minimum in said region a. This provides good control rod worth and low local power peaking.

7. 发明授权

US06510192B1 Boiling water type nuclear reactor core and operation method thereof 有权
标题翻译：沸水型核反应堆堆芯及其运行方法
公开(公告)号：US06510192B1
公开(公告)日：2003-01-21
申请号：US09703933
申请日：2000-11-02
申请人： Junichi Yamashita , Kumiaki Moriya , Katsumasa Haikawa , Yasuhiro Masuhara , Taichi Takii , Akihiro Yamanaka , Takao Kondo , Motoo Aoyama , Masao Chaki
发明人： Junichi Yamashita , Kumiaki Moriya , Katsumasa Haikawa , Yasuhiro Masuhara , Taichi Takii , Akihiro Yamanaka , Takao Kondo , Motoo Aoyama , Masao Chaki
IPC分类号： G21C334
CPC分类号： G21C7/113 , Y02E30/31 , Y02E30/39
摘要： A boiling water type nuclear reactor core, in which a plurality of fuel assemblies, each enclosed in a channel box, are loaded and a plurality of control rods, each having control blades, are arranged between the channel boxes. Long blade control rods, each having control rod blades which extend in four directions, are arranged between channel boxes on diagonals of square bundle regions each formed by a plurality of fuel assemblies, and short blade control rods, each having a control rod blade length of about half of the width of one of the square bundle regions, are arranged between the channel boxes in the center of each of the square bundle regions.
摘要翻译：沸水型核反应堆核心，其中装有封闭在通道箱中的多个燃料组件，并且在通道箱之间设置有多个控制杆，每个控制杆具有控制叶片。每个具有四个方向延伸的控制杆叶片的长叶片控制棒布置在每个由多个燃料组件形成的方形束区域的对角线上的通道箱之间，以及短叶片控制棒，每个叶片控制棒的控制杆叶片长度其中一个平方束区域的宽度的大约一半被布置在每个平方束区域的中心的通道盒之间。

8. 发明授权

US4926450A Fuel assembly 失效
标题翻译：燃油组件
公开(公告)号：US4926450A
公开(公告)日：1990-05-15
申请号：US171452
申请日：1988-03-21
申请人： Yasuhiro Masuhara , Soamu Yokomizo , Kotaro Inoue , Sadao Uchikawa , Motoo Aoyama , Junichi Yamashita , Yuichiro Yoshimoto , Tetsuo Yasuda , Hiromasa Hirakawa
发明人： Yasuhiro Masuhara , Soamu Yokomizo , Kotaro Inoue , Sadao Uchikawa , Motoo Aoyama , Junichi Yamashita , Yuichiro Yoshimoto , Tetsuo Yasuda , Hiromasa Hirakawa
IPC分类号： G21C3/326 , G21C3/322 , G21C3/328
CPC分类号： G21C3/322 , G21C2003/3225 , G21Y2002/201 , G21Y2004/30 , Y02E30/38
摘要： A fuel assembly including a plurality of fuel rods and water rods. The fuel rods are arranged with a predetermined pitch and two water rods are disposed adjacent to each other in a diagonal direction of the fuel assembly. More particularly, the fuel rods are arranged in a lattice of nine rows by nine columns and the two water rods are disposed inside a region corresponding to a space sufficient for disposing seven fuel rods at the center of the fuel assembly. Each of the water rods has an outer diameter greater than the pitch of the fuel rods.

9. 发明授权

US06205196B1 Boiling water type nuclear reactor core and operation method thereof 失效
标题翻译：沸水型核反应堆堆芯及其运行方法
公开(公告)号：US06205196B1
公开(公告)日：2001-03-20
申请号：US09048994
申请日：1998-03-27
申请人： Junichi Yamashita , Kumiaki Moriya , Katsumasa Haikawa , Yasuhiro Masuhara , Taichi Takii , Akihiro Yamanaka , Takao Kondo , Motoo Aoyama , Masao Chaki
发明人： Junichi Yamashita , Kumiaki Moriya , Katsumasa Haikawa , Yasuhiro Masuhara , Taichi Takii , Akihiro Yamanaka , Takao Kondo , Motoo Aoyama , Masao Chaki
IPC分类号： G21C334
CPC分类号： G21C7/113 , Y02E30/31 , Y02E30/39
摘要： A boiling water type nuclear reactor core, in which a plurality of fuel assemblies, each enclosed in a channel box, are loaded and a plurality of control rods, each having control blades, are arranged between the channel boxes. Latitudinal long blade control rods, each having control rod blades which extend latitudinally in four directions, are arranged between channel boxes on diagonals of square bundle regions each formed by a plurality of fuel assemblies, and latitudinal short blade control rods, each having control rod blades which extend latitudinally in four directions with each control rod blade having a latitudinal length of about half of the width of one of the square bundle regions, are arranged between the channel boxes in the center of each of the square bundle regions. The long blade control rods have a latitudinal blade length which is about twice as long as the latitudinal blade length of the short blade control rods.
摘要翻译：沸水型核反应堆核心，其中装有封闭在通道箱中的多个燃料组件，并且在通道箱之间设置有多个控制杆，每个控制杆具有控制叶片。横向长叶片控制棒，每个具有沿四个方向纬向延伸的控制杆叶片，布置在每个由多个燃料组件形成的方形束区域的对角线上的通道箱和纬向短叶片控制棒之间，每个具有控制杆叶片每个方形束区域的中心处的通道箱之间布置有横截面在四个方向上的横截面，每个控制杆叶片具有约一个平方束区域的宽度的大约一半的纬度长度。长叶片控制杆具有纬度叶片长度，其长度为短叶片控制棒的纬向叶片长度的两倍。

10. 发明授权

US5023047A Nuclear reactor having an ascending cooling path much greater than the descending cooling path 失效
标题翻译：核反应堆具有比下降冷却路径大得多的上升冷却路径
公开(公告)号：US5023047A
公开(公告)日：1991-06-11
申请号：US284345
申请日：1988-12-14
申请人： Koji Nishida , Osamu Yokomizo , Yasuhiro Masuhara , Toshitsugu Nakao , Shin-ichi Kashiwai , Akio Tomiyama , Junichi Yamashita , Tatsuo Hayashi
发明人： Koji Nishida , Osamu Yokomizo , Yasuhiro Masuhara , Toshitsugu Nakao , Shin-ichi Kashiwai , Akio Tomiyama , Junichi Yamashita , Tatsuo Hayashi
IPC分类号： G21C3/328 , G21C7/26 , G21C7/32
CPC分类号： G21C3/328 , G21C7/26 , G21C7/32 , Y02E30/38 , Y02E30/39
摘要： A fuel assembly has a water rod which consists of a coolant ascending path and a coolant descending path, the coolant ascending path opening below a fuel support of a lower tie plate, the coolant descending path opening above the fuel support and adapted to guide downwardly the coolant that has flowed up the coolant ascending path to the upper portion of the water rod. The lateral cross section of the coolant ascending path is more than 25 times that of the coolant descending path.The nuclear reactor with these fuel assemblies loaded in the core is operated as follows. After startup of the reactor when the reactor power is low, all the control rods inserted in the core are withdrawn completely. Then, the reactor power is controlled by regulating a liquid level formed in the water rods. This reactor operation method prolongs the lifetime of the control rods, thereby reducing the number of times they have to be replaced.
摘要翻译：燃料组件具有由冷却剂上升路径和冷却剂下降路径组成的水杆，所述冷却剂上升通道在下部接合板的燃料支撑件下方开口，所述冷却剂下降通道在所述燃料支撑件上方开口并适于向下引导已经将冷却剂上升通道流到水杆上部的冷却剂。冷却剂上升路径的横截面大约是冷却剂下降路径的25倍。装载在核心中的这些燃料组件的核反应堆如下操作。当反应堆功率低时，反应堆启动后，插入核心的所有控制棒全部撤出。然后，通过调节在水棒中形成的液面来控制反应堆功率。该反应器操作方法延长了控制棒的寿命，从而减少了它们必须更换的次数。

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