公开(公告)号：US5384814A

公开(公告)日：1995-01-24

申请号：US44687

申请日：1993-04-12

申请人： Bruce Matzner ,  Eric B. Johansson ,  Richard A. Wolters, Jr. ,  Thomas G. Dunlap ,  Robert B. Elkins ,  Harold B. King ,  Paul W. Sick

发明人： Bruce Matzner ,  Eric B. Johansson ,  Richard A. Wolters, Jr. ,  Thomas G. Dunlap ,  Robert B. Elkins ,  Harold B. King ,  Paul W. Sick

IPC分类号： G21C3/33 ,  G21C1/08 ,  G21C3/30 ,  G21C3/32 ,  G21C1/04

CPC分类号： G21C3/3206 ,  G21C1/086 ,  G21Y2002/104 ,  G21Y2002/201 ,  G21Y2004/30 ,  G21Y2004/302 ,  G21Y2004/303 ,  Y02E30/40

摘要： In a boiling water reactor fuel bundle, a three dimensional debris catching grid construction is placed within the flow volume defined by the lower tie plate assembly between the inlet nozzle and upper fuel rod supporting grid. A perforated plate is utilized having round holes as small consistent with the prevention of inadvertent closure due crudding and a hole pitch consistent with mechanical integrity requirements. The perforated plate is placed in a three dimensional construction such as a dome, cylinder, pyramid, inverted pyramid or corrugated construction spanning the flow volume of the lower tie plate assembly. As a consequence of this three dimensional grid construction, the total flow through area of the perforations in the metal plate does not introduce appreciable pressure drop in the lower tie plate assembly between the inlet nozzle and the rod supporting grid. Fluid movement at the debris restraining holes of the grid construction has a low flow velocity and a change in flow direction before passing through the holes to discourage debris from finding its way through the grid holes. Finally, it is possible to incorporate debris traps within the flow volume of the lower tie plate assembly that can cause trapping and subsequent removal of trapped debris upon fuel bundle replacement.

摘要翻译： 在沸水反应堆燃料束中，三维碎屑捕获栅格结构放置在由入口喷嘴和上燃料棒支撑栅之间的下连接板组件限定的流动体积内。 使用多孔板，其圆形孔小，防止由于粗糙度而导致的无意闭合，以及与机械完整性要求一致的孔间距。 多孔板被放置在三维结构中，例如圆顶，圆柱体，金字塔，倒金字塔或波纹结构，跨越下拉板组件的流动体积。 作为这种三维格栅结构的结果，金属板中的穿孔面积的总流量不会在入口喷嘴和支撑杆之间的下连接板组件中引入明显的压降。 格栅结构的碎屑限制孔处的流体运动在通过孔之前具有低流速和流动方向的变化，以阻止碎屑通过栅格孔。 最后，可以将碎屑收集器结合在下连接板组件的流动体积内，这可以导致在燃料束更换时捕获和随后的捕获的碎屑的去除。

公开(公告)号：US5483564A

公开(公告)日：1996-01-09

申请号：US196738

申请日：1994-02-15

申请人： Bruce Matzner ,  Eric B. Johansson ,  Richard A. Wolters, Jr. ,  Thomas G. Dunlap ,  Robert B. Elkins ,  Harold B. King ,  Paul W. Sick ,  Kevin L. Ledford

发明人： Bruce Matzner ,  Eric B. Johansson ,  Richard A. Wolters, Jr. ,  Thomas G. Dunlap ,  Robert B. Elkins ,  Harold B. King ,  Paul W. Sick ,  Kevin L. Ledford

IPC分类号： G21C3/33 ,  G21C1/08 ,  G21C3/30 ,  G21C3/32 ,  G21C1/04

CPC分类号： G21C3/3206 ,  G21C1/086 ,  G21Y2002/104 ,  G21Y2002/201 ,  G21Y2004/30 ,  G21Y2004/302 ,  G21Y2004/303 ,  Y02E30/40

摘要： In a boiling water reactor fuel bundle, a three dimensional debris catching grid construction is placed within the flow volume defined by the lower tie plate assembly between the inlet nozzle and upper fuel rod supporting grid. A perforated plate is utilized having round holes as small consistent with the prevention of inadvertent closure due crudding and a hole pitch consistent with mechanical integrity requirements. The perforated plate is placed in a three dimensional construction such as a dome, cylinder, pyramid, inverted pyramid or corrugated construction spanning the flow volume of the lower tie plate assembly. As a consequence of this three dimensional grid construction, the total flow through area of the perforations in the metal plate does not introduce appreciable pressure drop in the lower tie plate assembly between the inlet nozzle and the rod supporting grid. Fluid movement at the debris restraining holes of the grid construction has a low flow velocity and a change in flow direction before passing through the holes to discourage debris from finding its way through the grid holes. Finally, it is possible to incorporate debris traps within the flow volume of the lower tie plate assembly that can cause trapping and subsequent removal of trapped debris upon fuel bundle replacement. A double corrugated plate having large holes in the lower plate and smaller holes in the upper plate is utilized to trap debris.

摘要翻译： 在沸水反应堆燃料束中，三维碎屑捕获栅格结构放置在由入口喷嘴和上燃料棒支撑栅之间的下连接板组件限定的流动体积内。 使用多孔板，其圆形孔小，防止由于粗糙度而导致的无意闭合，以及与机械完整性要求一致的孔间距。 多孔板被放置在三维结构中，例如圆顶，圆柱体，金字塔，倒金字塔或波纹结构，跨越下拉板组件的流动体积。 作为这种三维格栅结构的结果，金属板中的穿孔面积的总流量不会在入口喷嘴和支撑杆之间的下连接板组件中引入明显的压降。 格栅结构的碎屑限制孔处的流体运动在通过孔之前具有低流速和流动方向的变化，以阻止碎屑通过栅格孔。 最后，可以将碎屑收集器结合在下连接板组件的流动体积内，这可以导致在燃料束更换时捕获和随后的捕获的碎屑的去除。 在下板中具有大孔的双层波纹板和上板中的较小孔用于捕集碎屑。