公开(公告)号：US08681929B2

公开(公告)日：2014-03-25

申请号：US12014133

申请日：2008-01-15

申请人： Paul M. Evans ,  Harry A. Pearce ,  Michael A. Marzean ,  David A. Boatwright

发明人： Paul M. Evans ,  Harry A. Pearce ,  Michael A. Marzean ,  David A. Boatwright

IPC分类号： G21C3/34

CPC分类号： G21C3/356 ,  G21C3/334 ,  G21C3/352 ,  G21Y2002/303 ,  G21Y2002/304 ,  G21Y2004/30 ,  Y02E30/40

摘要： A fuel assembly for a nuclear reactor that employs dissimilar materials for the fuel assembly grid and the control rod guide thimbles. The guide thimbles are secured to the grid employing a through grid cell sleeve that is welded to the grid and spot weld rings that are secured over the sleeve and welded directly to the guide tube through windows in the sleeve.

摘要翻译： 用于核反应堆的燃料组件，其使用用于燃料组件网格和控制棒导向套管的不同材料。 引导套管固定在栅格上，采用通过格栅单元套管焊接到栅格上，点焊结合环固定在套筒上，并通过套管中的窗口直接焊接到引导管上。

公开(公告)号：US07623612B2

公开(公告)日：2009-11-24

申请号：US11389793

申请日：2006-03-27

申请人： Michael A. Marzean ,  Quang M. Nguyen

发明人： Michael A. Marzean ,  Quang M. Nguyen

IPC分类号： G21C3/34

CPC分类号： G21C3/3408 ,  G21C3/352 ,  G21C3/356 ,  Y02E30/40

摘要： A bi-alloy spacer grid (BASG) is provided with grid straps and springs made using different zirconium alloys. The grid straps are made from a relatively low growth zirconium alloy, and the springs are made from a relatively high growth zirconium alloy. The springs are coupled to the grid straps by welding, mechanical interference, or secondary forming in place. When subjected to irradiation, the springs grow relative to the grid straps thereby maintaining contact with the fuel rod cladding, while the grid straps resist growth to maintain structural stability of the entire fuel assembly. The optimized balance of the high growth springs and low growth grid straps mitigates the formation of gaps between the fuel rods and grid support structures). The growth properties of the grid straps and springs may be further controlled through optional different fabrication processes.

摘要翻译： 双合金间隔栅格（BASG）配有网格带和使用不同锆合金制成的弹簧。 网格带由相对低成长的锆合金制成，弹簧由较高生长的锆合金制成。 弹簧通过焊接，机械干涉或二次成形而与网格带相连。 当照射时，弹簧相对于格栅条生长，从而保持与燃料棒包层的接触，而网格带抵抗生长以保持整个燃料组件的结构稳定性。 高增长弹簧和低增长网格带的优化平衡减轻了燃料棒和电网支撑结构之间的间隙的形成）。 可以通过可选的不同制造工艺进一步控制网格带和弹簧的生长特性。

公开(公告)号：US07548602B2

公开(公告)日：2009-06-16

申请号：US11372431

申请日：2006-03-09

申请人： Levie D. Smith, III ,  Michael A. Marzean

发明人： Levie D. Smith, III ,  Michael A. Marzean

IPC分类号： G21C3/34

CPC分类号： G21C3/322 ,  G21C3/352 ,  G21Y2002/304 ,  G21Y2004/30 ,  G21Y2004/403 ,  Y02E30/38

摘要： A spacer grid having tunable mixing vanes for optimizing coolant flow is provided for a nuclear fuel assembly. The mixing vanes include an upper piece and a lower piece, which are coupled to a middle ligament that is coupled to the top or downstream portion of one or more of the grid straps forming the spacer grid. The upper piece, lower piece, and middle ligament are bent, rotated, and/or twisted into various positions to more effectively mix the coolant and affect the coolant's flow as it moves upwards through the fuel assembly. For example, in one embodiment, the mixing vane has an “S” shape wherein the middle ligament is positioned parallel to the longitudinal axes of the fuel rods of the fuel assembly, the upper piece bends towards one of the fuel rods, and the lower piece bends away from the fuel rod. In this manner, optimized even and sustained mixing of the coolant is provided.

摘要翻译： 为核燃料组件提供了具有用于优化冷却剂流动的可调谐混合叶片的间隔栅格。 混合叶片包括上部件和下部件，其联接到中间韧带，该中间韧带联接到形成间隔物网格的一个或多个网格带的顶部或下游部分。 上部件，下部件和中间韧带被弯曲，旋转和/或扭曲成各种位置，以更有效地混合冷却剂并且当其向上移动通过燃料组件时影响冷却剂的流动。 例如，在一个实施例中，混合叶片具有“S”形状，其中中间韧带定位成平行于燃料组件的燃料棒的纵向轴线，上部件向着一个燃料棒弯曲，下部 零件远离燃料棒弯曲。 以这种方式，提供了优化的均匀和持续的冷却剂混合。