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1. 发明授权

US06650723B1 Double strip mixing grid for nuclear reactor fuel assemblies 失效
标题翻译：双层混合格栅用于核反应堆燃料组件
公开(公告)号：US06650723B1
公开(公告)日：2003-11-18
申请号：US09862383
申请日：2001-05-22
申请人： Heungseok Kang , Keenam Song , Kyungho Yoon , Hyungkyu Kim , Taehyun Chun , Dongseok Oh , Wangkee In , Yeonho Jung
发明人： Heungseok Kang , Keenam Song , Kyungho Yoon , Hyungkyu Kim , Taehyun Chun , Dongseok Oh , Wangkee In , Yeonho Jung
IPC分类号： G21C3352
CPC分类号： G21C3/352 , Y02E30/40
摘要： A double strip mixing grid for nuclear reactor fuel assemblies is disclosed. This grid is fabricated by intersecting at right angles a plurality of double strips, each fabricated by welding two thin sheets together into a single structure with coolant channels. The mixing grid, having the channels, effectively mixes low temperature coolant with high temperature coolant within a fuel assembly, thus improving the thermal efficiency of the fuel assemblies. This mixing grid also effectively prevents the coolant from being partially overheated, thus improving the soundness of nuclear reactors. This mixing grid also has swirling flow blades and/or lateral flow blades to further improve the thermal efficiency of the fuel assembly. This mixing grid elastically supports the fuel rods by the sheets of the double strips, collaterally acting as positioning springs. Each double strip also has a vertical slot at a position around each channel, and so the elastic range of the positioning springs of the grid is preferably enlarged. The slots also enlarge the fuel rod contact area of the grid, thereby effectively protecting the fuel rod from fretting corrosion. In addition, the intersecting strips are welded together at the intersections through a continuous welding process, thus improving the mechanical strength of the grid.
摘要翻译：公开了一种用于核反应堆燃料组件的双条混合格栅。该格栅是通过以直角相交的方式制造的，每条双重条带通过将两片薄片焊接在一起形成具有冷却剂通道的单一结构而制成。具有通道的混合格栅将低温冷却剂与燃料组件内的高温冷却剂有效地混合，从而提高燃料组件的热效率。该混合格栅还有效地防止了冷却液部分过热，从而提高了核反应堆的稳定性。该混合格栅还具有旋流流动叶片和/或侧向流动叶片，以进一步提高燃料组件的热效率。该混合格栅通过双重条带的片材弹性地支撑燃料棒，作为定位弹簧。每个双条带还在每个通道周围的位置具有垂直槽，因此优选地扩大栅格的定位弹簧的弹性范围。这些槽也扩大了电网的燃料棒接触面积，从而有效地保护了燃料棒免受磨损腐蚀。另外，交叉条通过连续焊接工艺在交点处焊接在一起，从而提高了电网的机械强度。

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