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    Boiling water type nuclear reactor core and operation method thereof
    2.
    发明授权
    Boiling water type nuclear reactor core and operation method thereof 失效
    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。

    Nuclear reactor having an ascending cooling path much greater than the descending cooling path
    5.
    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。

    Nuclear fuel assembly
    6.
    发明授权
    Nuclear fuel assembly 失效
    核燃料组件

    公开(公告)号：US5272741A

    公开(公告)日：1993-12-21

    申请号：US782812

    申请日：1991-10-25

    申请人： Yasuhiro Masuhara ,  Yasunori Bessho ,  Yuichiro Yoshimoto

    发明人： Yasuhiro Masuhara ,  Yasunori Bessho ,  Yuichiro Yoshimoto

    IPC分类号： G21C3/322 ,  G21C3/344 ,  G21C3/34

    CPC分类号： G21C3/344 ,  G21C3/322 ,  G21Y2002/201 ,  G21Y2004/30 ,  Y02E30/31 ,  Y02E30/38

    摘要： A nuclear fuel assembly for a BWR comprises a plurality of fuel rods, a polygonal channel box surrounding the fuel rods, a plurality of spacers axially spaced from each other and each keeping the fuel rods laterally spaced from each other, and a plurality of vanes disposed only in a region at and around a corner within the channel box, for generating swirling flows in the region to thicken a liquid film on each fuel rod in the region.

    摘要翻译： 用于BWR的核燃料组件包括多个燃料棒，围绕燃料棒的多边形通道箱，多个彼此间隔开的间隔件，并且每个保持燃料棒彼此横向隔开，并且设置多个叶片 仅在通道箱内的拐角处和周围的区域中，用于在该区域中产生旋流以增加该区域中每个燃料棒上的液膜。

    Fuel assembly and fuel spacer
    7.
    发明授权
    Fuel assembly and fuel spacer 失效
    燃油组件和燃油间隔器

    公开(公告)号：US5112571A

    公开(公告)日：1992-05-12

    申请号：US510192

    申请日：1990-04-17

    申请人： Akihito Orii ,  Osamu Yokomizo ,  Yasuhiro Masuhara ,  Koji Nishida ,  Shigeto Murata ,  Shin-ichi Kashiwai ,  Kotaro Inoue ,  Yuichiro Yoshimoto

    发明人： Akihito Orii ,  Osamu Yokomizo ,  Yasuhiro Masuhara ,  Koji Nishida ,  Shigeto Murata ,  Shin-ichi Kashiwai ,  Kotaro Inoue ,  Yuichiro Yoshimoto

    IPC分类号： G21C3/322 ,  G21C3/344

    CPC分类号： G21C3/322 ,  G21C3/344 ,  Y02E30/38

    摘要： In a fuel assembly having fuel rods inserted into regularly arranged cells of a fuel spacer which keeps the fuel rods correctly spaced from one another and has spacer elements disposed in a plurality of stages in the longitudinal direction of the fuel rods, the fuel spacer comprises vanes formed on the cells in such a manner that each vane is bent from a cut formed in a part of the side wall of the cell. The vanes obliquely project into the corresponding spaces between adjacent fuel rods and allow a coolant flowing through the spaces and forming two-phase flows to generate swirling flows toward the fuel rods. The fuel spacer may alternatively comprise either thin-walled cylinders having built-in vanes or spiral vanes, which are fixed to the spacer that has not been subjected to any direct machining. Also disclosed is a fuel assembly provided with any of the above-described fuel spacers. The arrangement of the present invention enables, while assuring a sufficient strength for maintaining fuel rods in their correct position, the transfer of heat from the fuel rods to the coolant to be promoted so as to raise the allowable power level of the fuel assembly, and enables the void ratio to be lowered so as to increase the reactivity.

    摘要翻译： 在具有插入燃料间隔件的规则布置的单元中的燃料棒的燃料组件中，燃料棒将燃料棒彼此正确地间隔开并具有沿着燃料棒的纵向设置成多级的间隔元件，燃料间隔件包括叶片 形成在电池上，使得每个叶片从形成在电池的侧壁的一部分中的切口弯曲。 叶片倾斜地突出到相邻燃料棒之间的相应空间中，并允许冷却剂流过空间并形成两相流以产生朝向燃料棒的旋流。 燃料间隔器可以可选地包括具有内置叶片或螺旋叶片的薄壁圆柱体，其固定到未经受任何直接加工的间隔件。 还公开了一种具有任何上述燃料间隔件的燃料组件。 本发明的结构在确保足够的强度以保持燃料棒处于其正确位置的同时，能够将热量从燃料棒传递到冷却剂以提高燃料组件的允许功率水平， 使空隙率降低，从而提高反应性。

    Piping branch structure
    8.
    发明授权
    Piping branch structure 失效
    管道分支结构

    公开(公告)号：US4993454A

    公开(公告)日：1991-02-19

    申请号：US925907

    申请日：1986-11-03

    申请人： Yasuhiro Masuhara ,  Osamu Yokomizo ,  Koichi Kotani ,  Shinichi Kashiwai ,  Iwao Yokoyama

    发明人： Yasuhiro Masuhara ,  Osamu Yokomizo ,  Koichi Kotani ,  Shinichi Kashiwai ,  Iwao Yokoyama

    IPC分类号： F16L41/08 ,  F16L41/02 ,  G21C15/22

    CPC分类号： F16L41/021 ,  Y10T137/8593 ,  Y10T137/85938

    摘要： A piping branch structure includes a branch pipe distributing an inflowing fluid to pipes in at least three directions, and one of the pipes face a direction of flow of the fluid, wherein a fluid inlet of one of the pipes protrudes into the branch pipe. By protruding a fluid inlet of a pipe which faces a direction of flow of the fluid into the branch pipe, the protruding pipe act as obstacles, thus no vortex is generated and the non-vortex flow state can be maintain. In case of piping of recirculating system of a reactor, an inner pipe, whose structure is integral with that of a riser pipe, is provided so that the inner pipe extends toward a master tube side in a cross branch pipe. The inner pipe is provided holes and a flow-regulating plate. The quantity of cooling water circulating through the core of the reactor and the flow state of the cooling water in the pressure vessel are stabilized and balanced.

    摘要翻译： 管道分支结构包括：分支管道，其至少在三个方向上将流入流体分配给管道，并且一个管道面对流体的流动方向，其中一个管道的流体入口突出到分支管中。 通过将与流体的流动方向相对的管的流体入口突出到分支管中，突出管作为障碍物，因此不会产生涡流，并且可以维持非涡流状态。 在反应堆的再循环系统的配管的情况下，设置与管道整体结构一体的内管，使内管在横支管中向主管侧延伸。 内管设有孔和流量调节板。 通过反应器的核心循环的冷却水的量和压力容器中的冷却水的流动状态被稳定和平衡。

    Fuel assembly
    9.
    发明授权
    Fuel assembly 失效
    燃油组件

    公开(公告)号：US4914679A

    公开(公告)日：1990-04-03

    申请号：US223639

    申请日：1988-07-25

    申请人： Akio Tomiyama ,  Osamu Yokomizo ,  Yasuhiro Masuhara ,  Toshitsugu Nakao ,  Shin-ichi Kashiwai ,  Yoshishige Kawada ,  Hiromasa Hirakawa ,  Shigeto Murata

    发明人： Akio Tomiyama ,  Osamu Yokomizo ,  Yasuhiro Masuhara ,  Toshitsugu Nakao ,  Shin-ichi Kashiwai ,  Yoshishige Kawada ,  Hiromasa Hirakawa ,  Shigeto Murata

    IPC分类号： G21C3/10 ,  G21C3/33

    CPC分类号： G21C3/3315 ,  Y02E30/40

    摘要： A fuel assembly according to the present invention is formed in such a manner that the small diameter portion of an upper end plug of a fuel rod is inserted into a boss of an upper tie-plate. The upper end plug includes a small diameter portion and a large diameter portion which is disposed below the former. An expansion spring in disposed in the small diameter portion of the upper end plug. A cover member surrounding this expansion spring is disposed in the large diameter portion of the upper end plug, and extends upwardly. Since the cover member surrounds the expansion spring, pressure loss caused by the expansion spring can be reduced.

    摘要翻译： 根据本发明的燃料组件形成为使得燃料棒的上端塞的小直径部分插入上连接板的凸台中。 上端塞包括一个小直径部分和一个大直径部分，该部分设置在前者的下方。 膨胀弹簧设置在上端塞的小直径部分中。 围绕该膨胀弹簧的盖构件设置在上端塞的大直径部分中并向上延伸。 由于盖构件围绕膨胀弹簧，所以可以减小由膨胀弹簧引起的压力损失。