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 After startup of the reactor when the reactor power is low, all the control rods inserted in the core are withdrawn completely.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。

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。

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。

公开(公告)号：US5253278A

公开(公告)日：1993-10-12

申请号：US705723

申请日：1991-05-24

申请人： Toru Kanazawa ,  Osamu Yokomizo ,  Shin-ichi Kashiwai ,  Akihito Orii ,  Koji Nishida ,  Tatsuo Hayashi ,  Junjiro Nakajima

发明人： Toru Kanazawa ,  Osamu Yokomizo ,  Shin-ichi Kashiwai ,  Akihito Orii ,  Koji Nishida ,  Tatsuo Hayashi ,  Junjiro Nakajima

IPC分类号： G21C3/324 ,  G21C3/33 ,  G21C3/332 ,  G21C5/18 ,  G21C21/00 ,  G21C3/32

CPC分类号： G21C3/324 ,  G21C3/332 ,  G21Y2002/303 ,  G21Y2004/30 ,  Y02E30/40

摘要： A fuel assembly included a plurality of fuel rods, fuel spacers for maintaining gaps between the fuel rods and a channel box. The channel box includes spacer support portions projecting inwardly from an inner surface of the channel box and supporting the fuel spacer in a transverse direction and creep deformation inhibition portions disposed at the lower end portion of the channel box and projecting inwardly. The distance between the spacer support portions disposed to oppose one another in a horizontal direction is smaller than the distance between the creep deformation inhibition portions opposing one another in the horizontal direction.

公开(公告)号：US5386440A

公开(公告)日：1995-01-31

申请号：US675

申请日：1993-01-05

申请人： Shin-ichi Kashiwai ,  Osamu Yokomizo ,  Akihito Orii ,  Koji Nishida ,  Toru Kanazawa ,  Kumiaki Moriya

发明人： Shin-ichi Kashiwai ,  Osamu Yokomizo ,  Akihito Orii ,  Koji Nishida ,  Toru Kanazawa ,  Kumiaki Moriya

IPC分类号： G21C3/322 ,  G21C3/32

CPC分类号： G21C3/322 ,  G21Y2002/206 ,  G21Y2004/30 ,  G21Y2004/302 ,  Y02E30/31 ,  Y02E30/38

摘要： An object of the present invention is to provide a boiling water reactor wherein two phase flow instability in a fuel assembly occurs scarcely.A bottom flow path is formed beneath a partition plate which is supported by control rod driving mechanism housings in a reactor pressure vessel, and coolant guide tubes which open beneath the partition plate stands perpendicularly on the partition plate. An upper end portion of the coolant guide tube is restrained at outer periphery by a fixing portion of a square grid, and a coolant entrance of a fuel assembly is connected through to the coolant guide tube.Pressure loss of the coolant decreases and flow instability of the coolant in the fuel assembly occurs scarcely, lowering of a critical power ratio at a pump trip can be suppressed.

摘要翻译： 本发明的目的是提供一种沸水反应器，其中几乎不发生燃料组件中的两相流不稳定性。 在反应堆压力容器内由控制棒驱动机构壳体支撑的分隔板下方形成底部流路，并且在分隔板下方开口的冷却剂引导管垂直地放置在隔板上。 冷却剂引导管的上端部通过方格栅的固定部分被限制在外周，并且燃料组件的冷却剂入口连接到冷却剂引导管。 冷却剂的压力损失减少，并且几乎不发生燃料组件中的冷却剂的流动不稳定性，可以抑制泵脱扣时的临界功率比的降低。