公开(公告)号：US5515408A

公开(公告)日：1996-05-07

申请号：US352849

申请日：1994-12-02

申请人： Junichi Oyama ,  Akihiro Kato ,  Masaji Mori ,  Toshiyuki Kawagoe ,  Kazuichi Suzuki ,  Hitoshi Inada ,  Hiromasa Miyai

发明人： Junichi Oyama ,  Akihiro Kato ,  Masaji Mori ,  Toshiyuki Kawagoe ,  Kazuichi Suzuki ,  Hitoshi Inada ,  Hiromasa Miyai

IPC分类号： G21C3/33 ,  G21C3/322 ,  G21C3/34 ,  G21C3/352 ,  G21C7/00

CPC分类号： G21C3/322 ,  G21C3/352 ,  G21Y2002/101 ,  G21Y2002/207 ,  G21Y2004/302 ,  Y02E30/38

摘要： A fuel assembly is presented in which a plurality of support grids are disposed along the longitudinal direction of the fuel rods. The straps forming the grid cells of the support grids are provided with mixing vanes for generating turbulent flow of the cooling water passing through the grid cells. In a plan view of the support girds, each of the mixing vanes protrudes inwardly of the grid cells and is disposed along a positive diagonal direction and a negative diagonal direction. This configuration of the mixing vanes are effective in preventing the generation of systematic vibrations in the fuel assembly by canceling the effects of the turbulent flows of the cooling water. The direction of protrusion of the mixing vanes can be in two diagonal directions within one support grid, or it can be unidirectional along either diagonal direction within one support grid.

摘要翻译： 提出了一种燃料组件，其中沿着燃料棒的纵向方向设置有多个支撑格栅。 形成支撑网格的网格单元的条带设置有用于产生通过网格单元的冷却水的湍流的混合叶片。 在支撑线的平面图中，每个混合叶片向网格单元的内部突出并且沿着正的对角线方向和负的对角线方向设置。 混合叶片的这种构造通过消除冷却水的湍流的影响来有效地防止燃料组件中的系统振动的产生。 混合叶片的突出方向可以在一个支撑格栅内的两个对角线方向上，或者它可以在一个支撑格栅内的任一对角线方向上是单向的。

公开(公告)号：US5359633A

公开(公告)日：1994-10-25

申请号：US128138

申请日：1993-09-29

申请人： Junichi Oyama ,  Kazuichi Suzuki ,  Akhirio Kato ,  Hitoshi Inada ,  Masaji Mori ,  Hiromasa Miyai ,  Toshiyuki Kawagoe

发明人： Junichi Oyama ,  Kazuichi Suzuki ,  Akhirio Kato ,  Hitoshi Inada ,  Masaji Mori ,  Hiromasa Miyai ,  Toshiyuki Kawagoe

IPC分类号： G21C3/34 ,  G21C3/334 ,  G21C21/00

CPC分类号： G21C3/334 ,  Y02E30/40

摘要： In a method of assembling a nuclear fuel assembly, a deflecting jig is inserted into grid cells in each of a plurality of grids. The diameter of the deflecting jig is enlarged to urge a spring of at least one pair of dimples and spring associated with the grid cell to deflect the springs away from the dimple. A plurality of elongated key members are inserted into the grid cells through a plurality of openings defined at intersections between the straps forming walls of the grid cells. Each key member is rotated about its axis to cause hooks of the key member to project from a wall surface of the strap in a direction opposite to the projecting direction of the springs. The key member is then moved in a direction to engage the hooks with the wall surface of the strap. Urging of the spring by the deflecting jig is released to allow the same to be withdrawn from the grid cells and, subsequently, the fuel rods are inserted into the respective grid cells. The key member is then moved in a direction to bring the springs into pressure contact with the fuel rods. The key members are then withdrawn from the grid cells.

摘要翻译： 在组装核燃料组件的方法中，偏转夹具插入到多个网格中的每一个中的网格单元中。 偏转夹具的直径被扩大以促使与栅格单元相关联的至少一对凹坑和弹簧的弹簧使弹簧偏离凹坑。 多个细长的键构件通过限定在形成网格单元的壁的带的相交处的多个开口插入到网格单元中。 每个键构件围绕其轴线旋转，使得键构件的钩子沿着与弹簧的突出方向相反的方向从带的壁表面突出。 然后将键构件沿着将钩与带的壁表面接合的方向移动。 通过偏转夹具推动弹簧被释放以允许其从网格单元中取出，并且随后将燃料棒插入相应的格栅单元中。 然后将钥匙件沿一个方向移动以使弹簧与燃料棒压力接触。 然后将关键成员从网格单元中撤出。