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    Nuclear reactor having an ascending cooling path much greater than the descending cooling path
    2.
    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 After startup of the reactor when the reactor power is low, all the control rods inserted in the core are withdrawn completely.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。

    Fuel assembly
    4.
    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。