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    Fuel assembly and reactor core
    1.
    发明授权
    Fuel assembly and reactor core 失效
    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。

    Fuel assembly
    2.
    发明授权
    Fuel assembly 失效

    公开(公告)号：US6061416A

    公开(公告)日：2000-05-09

    申请号：US22678

    申请日：1998-02-12

    申请人： Junichi Koyama ,  Motoo Aoyama ,  Koji Nishida ,  Junichi Yamashita

    发明人： Junichi Koyama ,  Motoo Aoyama ,  Koji Nishida ,  Junichi Yamashita

    IPC分类号： G21C3/328 ,  G21C3/32 ,  G21C3/00 ,  G21C3/30

    CPC分类号： G21C3/328 ,  Y02E30/38

    摘要： Each of short-length fuel rods 3 is arranged at a position other than in 3.times.3 corner regions 6 to 9 in such a manner as not to be simultaneously adjacent to a water rod 5 and others of the short-sized fuel rods. Gd fuel rods 4 are arranged at positions excluding the outer periphery, and the number of those of the Gd fuel rods 4 adjacent to the short-length fuel rods 3 is one-half or less the total number of the Gd fuel rods. At a transverse cross-section of a region upward from upper ends of the short-sized fuel rods 3, the amount of burnable poison contained in a polygonal region 10 whose vertexes are located at centers of those of the first fuel rods 3 arranged at the outermost layer is smaller than the amount of burnable poison outside the region 10. With this configuration, a critical power can be improved in consideration of both a distribution of the flow of coolant and a distribution of a thermal power in the fuel assembly.

    Fuel assembly
    3.
    发明授权
    Fuel assembly 有权
    燃油组件

    公开(公告)号：US06335956B1

    公开(公告)日：2002-01-01

    申请号：US09502334

    申请日：2000-02-11

    申请人： Junichi Koyama ,  Motoo Aoyama ,  Koji Nishida ,  Junichi Yamashita

    发明人： Junichi Koyama ,  Motoo Aoyama ,  Koji Nishida ,  Junichi Yamashita

    IPC分类号： G21C332

    CPC分类号： G21C3/328 ,  Y02E30/38

    摘要： Each of short-length fuel rods 3 is arranged at a position other than in 3×3 corner regions 6 to 9 in such a manner as not to be simultaneously adjacent to a water rod 5 and others of the short-sized fuel rods. Gd fuel rods 4 are arranged at positions excluding the outer periphery, and the number of those of the Gd fuel rods 4 adjacent to the short-length fuel rods 3 is one-half or less the total number of the Gd fuel rods. At a transverse cross-section of a region upward from upper ends of the short-sized fuel rods 3, the amount of burnable poison contained in a polygonal region 10 whose vertexes are located at centers of those of the first fuel rods 3 arranged at the outermost layer is smaller than the amount of burnable poison outside the region 10. With this configuration, a critical power can be improved in consideration of both a distribution of the flow of coolant and a distribution of a thermal power in the fuel assembly.

    摘要翻译： 短长度的燃料棒3中的每一个都配置在不同于3×3角区域6〜9的位置，不能与短棒燃料棒的水杆5等同时相邻。 Gd燃料棒4配置在除了外周的位置，并且与短长度燃料棒3相邻的Gd燃料棒4的数量是Gd燃料棒的总数的一半以下。 在从小型燃料棒3的上端向上方的区域的横截面上，包含在多边形区域10中的可燃毒物的量，其顶点位于布置在第一燃料棒3的第一燃料棒3的顶点的中心 最外层的面积小于区域10外部的可燃毒物的量。利用这种结构，考虑到冷却剂的流动分布和燃料组件中的火力分配两者，可以提高临界功率。

    Fuel assembly
    6.
    发明授权
    Fuel assembly 失效
    燃油组件

    公开(公告)号：US5528641A

    公开(公告)日：1996-06-18

    申请号：US357261

    申请日：1994-12-13

    申请人： Kenichi Takeuchi ,  Koji Nishida ,  Yasunori Bessho ,  Yukihisa Fukasawa ,  Junjiro Nakajima

    发明人： Kenichi Takeuchi ,  Koji Nishida ,  Yasunori Bessho ,  Yukihisa Fukasawa ,  Junjiro Nakajima

    IPC分类号： G21C3/326 ,  G21C3/322 ,  G21C7/27 ,  G21C3/32

    CPC分类号： G21C3/322 ,  G21Y2002/201 ,  G21Y2002/304 ,  G21Y2004/30 ,  G21Y2004/302 ,  G21Y2004/403 ,  Y02E30/38

    摘要： A fuel assembly is provided with a coolant ascending path for making coolant rise and a water rod having a coolant descending path for conducting the coolant.A ratio of a flow area in a coolant inlet port of the smallest in coolant ascending path 13 on the downstream side than large diameter tube portion 3E to a flow area of the largest in the axial direction of coolant ascending path 13 in large diameter tube portion 3E is set to be 0.2-20%.In the normal operation, the declination degree from the liquid level in the coolant ascending path, corresponding to the coolant flow rate of the liquid level formed in the coolant ascending path can be controlled. Further, at the time of the excess the change speed of the liquid level can also be controlled.

    摘要翻译： 燃料组件设置有用于使冷却剂升起的冷却剂上升路径和具有用于导引冷却剂的冷却剂下降路径的水杆。 在大直径管部3E的下游侧的冷却剂上升路径13中的最小的冷却剂入口的流入面积与大径管部中的冷却剂上升路径13的轴向上最大的流动面积的比 3E设定为0.2〜20％。 在正常操作中，可以控制与冷却剂上升路径中形成的液面的冷却剂流量相对应的冷却剂上升路径中的液位的偏角度。 此外，在过量时，也可以控制液面的变化速度。

    Fuel assembly
    7.
    发明授权
    Fuel assembly 失效
    燃油组件

    公开(公告)号：US5490192A

    公开(公告)日：1996-02-06

    申请号：US247854

    申请日：1994-05-23

    申请人： Junjiro Nakajima ,  Koji Nishida ,  Satoshi Kanno ,  Tadashi Mizuno ,  Yasunori Bessho ,  Masahisa Inagaki ,  Yasuhiro Aizawa

    发明人： Junjiro Nakajima ,  Koji Nishida ,  Satoshi Kanno ,  Tadashi Mizuno ,  Yasunori Bessho ,  Masahisa Inagaki ,  Yasuhiro Aizawa

    IPC分类号： G21C3/344 ,  G21C3/34

    CPC分类号： G21C3/344 ,  G21Y2002/101 ,  G21Y2004/302 ,  Y02E30/40

    摘要： A fuel assembly comprises a plurality of fuel rods, tie plates for holding both ends of these fuel rods, and spacers which support these fuel rods. The spacer comprises a plurality of cells into which the fuel rods are inserted respectively, the adjacent cells being joined to each other at axial ends thereof, whereby a space between these cells being held or retained, and a plurality of loop springs held respectively on the cells. Each of the loop springs has a pair of resilient members which are located within the pair of adjacent cells and which urge the fuel rods in a radial direction, and a pair of connections which connect axial ends of the resilient members to each other. Each of the connections have a passage through which coolant flows axially and which is defined by a closed peripheral wall. The closed peripheral wall is not uniform in thickness. The pair of adjacent cells have at axial end portions of peripheral walls openings for accommodating or receiving the connections of the loop spring.

    摘要翻译： 燃料组件包括多个燃料棒，用于保持这些燃料棒的两端的连接板以及支撑这些燃料棒的间隔件。 间隔件包括分别插入燃料棒的多个单元，相邻的单元在其轴向端部彼此接合，由此保持或保持这些单元之间的空间，以及分别保持在该单元上的多个环形弹簧 细胞。 每个环形弹簧具有一对弹性构件，该弹性构件位于一对相邻的单元内并且沿径向推动燃料棒，以及将弹性构件的轴向端部彼此连接的一对连接件。 每个连接件都有一个通道，冷却剂通过该通道轴向流动，并由封闭的外围壁限定。 封闭的周边壁厚度不均匀。 一对相邻的单元具有用于容纳或接收环形弹簧的连接的外围壁开口的轴向端部。

    Fuel assembly and nuclear reactor
    8.
    发明授权
    Fuel assembly and nuclear reactor 失效
    燃料装配和核反应堆

    公开(公告)号：US5617456A

    公开(公告)日：1997-04-01

    申请号：US463828

    申请日：1995-06-05

    申请人： Hideki Kurosaki ,  Junjiro Nakajima ,  Hajime Umehara ,  Shozo Nakamura ,  Satoshi Kanno ,  Koji Nishida ,  Yasunori Bessho ,  Masahisa Inagaki ,  Osamu Yokomizo ,  Yuichiro Yoshimoto

    发明人： Hideki Kurosaki ,  Junjiro Nakajima ,  Hajime Umehara ,  Shozo Nakamura ,  Satoshi Kanno ,  Koji Nishida ,  Yasunori Bessho ,  Masahisa Inagaki ,  Osamu Yokomizo ,  Yuichiro Yoshimoto

    IPC分类号： G21C3/328 ,  G21C21/00

    CPC分类号： G21C3/328 ,  Y02E30/38

    摘要： The lower end of each of a plurality of fuel rods is supported by a fuel supporting portion of a lower tie plate. The fuel supporting portion includes a plurality of second coolant paths for supplying a coolant from below the fuel supporting portion to a first coolant path defined above the fuel supporting portion and between the fuel rods. The total cross-sectional area of all the second coolant paths is smaller than the cross-sectional area of the first coolant path. A water rod disposed between the fuel rods each includes an ascending tube path having therein a coolant ascending path having a coolant inlet port opening to a region below the fuel supporting portion, for guiding upward the coolant supplied through the coolant inlet port, and a descending tube having therein a coolant descending path having a coolant delivery port opening to said first coolant path, for guiding downward the coolant guided by said coolant ascending path and discharging the coolant through the coolant delivery port to the first coolant path. The descending tube path is so disposed outside the ascending tube path as to define a gap, through which the coolant inside the first coolant path flows, between it and the ascending tube path.

    摘要翻译： 多个燃料棒的每一个的下端由下连接板的燃料支撑部支撑。 燃料支撑部分包括多个第二冷却剂路径，用于将冷却剂从燃料支撑部分下方供应到限定在燃料支撑部分上方和燃料棒之间的第一冷却剂路径。 所有第二冷却剂通道的总截面积小于第一冷却剂通道的横截面面积。 设置在燃料棒之间的水杆各自包括上升管路，其中具有冷却剂上升路径，其具有通向燃料支撑部分下方的区域的冷却剂入口，用于向上引导通过冷却剂入口提供的冷却剂， 其中具有冷却剂下降路径，其具有通向所述第一冷却剂路径的冷却剂输送口，用于向下引导由所述冷却剂上升路径引导的冷却剂并将冷却剂通过冷却剂输送端口排出到第一冷却剂路径。 下降的管道设置在上升管道的外侧，以便限定第一冷却剂路径内的冷却剂在其与上升的管道之间流动的间隙。

    Fuel assembly and reactor core and fuel spacer and channel box
    9.
    发明授权
    Fuel assembly and reactor core and fuel spacer and channel box 有权
    燃油组件和反应堆核心和燃料间隔物和通道箱

    公开(公告)号：US06516043B1

    公开(公告)日：2003-02-04

    申请号：US09471606

    申请日：1999-12-23

    申请人： Masao Chaki ,  Koji Nishida ,  Motoo Aoyama ,  Junichi Koyama ,  Katsumasa Haikawa ,  Yasuhiro Aizawa

    发明人： Masao Chaki ,  Koji Nishida ,  Motoo Aoyama ,  Junichi Koyama ,  Katsumasa Haikawa ,  Yasuhiro Aizawa

    IPC分类号： G21C300

    CPC分类号： G21C3/324 ,  G21C3/328 ,  G21C3/332 ,  Y02E30/31 ,  Y02E30/38

    摘要： A fuel assembly includes a plurality of fuel rods placed in a square lattice array of 9-rows/9-columns and at least one water rod. In this fuel assembly, the fuel rod pitch of the plurality of fuel rods is in a range of 14.15 mm to 14.65 mm, and means for offsetting and holding a fuel bundle composed of the fuel rods and the water rod is provided in such a manner that the center in a cross section of the fuel bundle is offset from the center in a cross section of the lower tie plate toward the channel fastener side. With this configuration, it is possible to provide a fuel assembly for a D-lattice core, which is capable of achieving the fuel economy comparable to that of a C-lattice core without reducing the thermal margin, and of using the existing fuel spacers.

    摘要翻译： 一种燃料组件包括多个放置在9列/ 9列的正方形格子阵列和至少一个水杆中的燃料棒。 在该燃料组件中，多个燃料棒的燃料棒间距在14.15mm〜14.65mm的范围内，由燃料棒和水杆构成的燃料束的抵接和保持装置以这种方式 燃料束的横截面中的中心在下连接板的横截面中朝向通道紧固件侧偏离中心。 利用这种结构，可以提供一种用于D格子芯的燃料组件，其能够实现与C晶格铁芯的燃料经济性相当而不降低热裕度，并且使用现有的燃料间隔件。

    Nuclear reactor having an ascending cooling path much greater than the descending cooling path
    10.
    发明授权
    Nuclear reactor having an ascending cooling path much greater than the descending cooling path 失效
    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。