公开(公告)号：US06721384B2

公开(公告)日：2004-04-13

申请号：US10281472

申请日：2002-10-25

申请人： Dongseok Oh ,  Taehyun Chun ,  Wangkee In ,  Keenam Song ,  Hyungkyu Kim ,  Heungseok Kang ,  Kyungho Yoon ,  Younho Jung

发明人： Dongseok Oh ,  Taehyun Chun ,  Wangkee In ,  Keenam Song ,  Hyungkyu Kim ,  Heungseok Kang ,  Kyungho Yoon ,  Younho Jung

IPC分类号： G21C334

CPC分类号： G21C3/322 ,  G21C3/3424 ,  Y02E30/38

摘要： A spacer grid for nuclear fuel assemblies is disclosed. This spacer grid has a plurality of side weld supports, that is, main supports, upper sub-supports and lower sub-supports, on its interlaced inner straps, with two flow mixing vanes integrally extending upward from each of the main supports. This spacer grid is fabricated by seam-welding the interlaced first and second inner straps to each other along the upper axial junction lines of the crossing main and upper sub-supports at the top of the intersections, and along the lower axial junction lines of the crossing lower sub-supports at the bottom of the intersections, thus forming side weld lines at the intersections. This spacer grid reduces the damage of fuel rod during a fuel rod insertion process by decreasing interference between flow mixing vanes and fuel rods, accomplishes a desired soundness by seam welding, improves the coolant mixing efficiency of the flow mixing vanes by excluding welding windows, and reduces hydraulic resistance caused by weld beads.

摘要翻译： 公开了用于核燃料组件的间隔栅格。 该间隔栅格在其交错的内带上具有多个侧面焊接支撑件，即主支撑件，上副支撑件和下副支撑件，其中两个流动混合叶片从每个主支撑件向上整体地延伸。 该间隔栅格是通过沿交叉的顶部与交叉主顶部和上部副支承件的上部轴向连接线将隔行的第一和第二内部带彼此沿缝合焊接而制造的， 在交叉点的底部交叉下部副支撑，从而在交叉点处形成侧面焊接线。 该隔离栅格通过减少流动混合叶片和燃料棒之间的干扰，通过缝焊实现所需的稳定性，从而减少了燃料棒插入过程中燃料棒的损坏，通过排除焊接窗口提高了流动混合叶片的冷却剂混合效率， 降低由焊缝引起的液压阻力。

公开(公告)号：US06714619B2

公开(公告)日：2004-03-30

申请号：US10215996

申请日：2002-08-07

申请人： Dongseok Oh ,  Taehyun Chun ,  Wangkee In ,  Keenam Song ,  Hyungkyu Kim ,  Heungseok Kang ,  Kyungho Yoon ,  Younho Jung

发明人： Dongseok Oh ,  Taehyun Chun ,  Wangkee In ,  Keenam Song ,  Hyungkyu Kim ,  Heungseok Kang ,  Kyungho Yoon ,  Younho Jung

IPC分类号： G21C334

CPC分类号： G21C3/322 ,  G21C3/352 ,  G21Y2002/201 ,  G21Y2002/303 ,  G21Y2004/302 ,  Y02E30/38

摘要： A spacer grid for use in a nuclear fuel assembly has double-deflected vanes that guide an axial flow of coolant around fuel rods and thereby generate swirl flow. The vanes each have a double bend projecting upwardly from first inner straps and projecting toward one fuel rod. The vanes are sufficiently wide at their bases to prevent inadvertent deformation due to contact with fuel rods during an insertion of fuel rods into the cells. The vanes also make a smooth variation in the cross-sectional area of the coolant channel at the outlet of the spacer grid, thus reducing a loss of pressure during reactor operation.

摘要翻译： 用于核燃料组件的间隔栅格具有引导冷却剂在燃料棒周围的轴向流动并由此产生涡流的双偏转叶片。 叶片各自具有从第一内带向上突出并向一个燃料棒突出的双重弯曲。 叶片在其底部足够宽，以防止在将燃料棒插入电池期间由于与燃料棒接触而导致的意外变形。 叶片还使得间隔栅格出口处的冷却剂通道的横截面积的平滑变化，从而减少了反应器操作期间的压力损失。

公开(公告)号：US06278759B1

公开(公告)日：2001-08-21

申请号：US09558043

申请日：2000-04-26

申请人： Kyungho Yoon ,  Heungseok Kang ,  Keenam Song ,  Youn Ho Jung ,  Taehyun Chun ,  Dongseok Oh ,  Wangkee In

发明人： Kyungho Yoon ,  Heungseok Kang ,  Keenam Song ,  Youn Ho Jung ,  Taehyun Chun ,  Dongseok Oh ,  Wangkee In

IPC分类号： G21C334

CPC分类号： G21C3/3566 ,  G21C3/352 ,  G21Y2002/201 ,  G21Y2002/206 ,  G21Y2002/303 ,  G21Y2004/30 ,  Y02E30/40

摘要： A nuclear fuel spacer grid, fabricated by intersecting a plurality of grid strips and used for placing and supporting a plurality of elongated fuel rods within a nuclear fuel assembly, is disclosed. The spacer grid of this invention has a plurality of dimple vanes on its grid strips. The dimple vanes are designed to guide the coolant from one cell to neighboring cells of the spacer grid, thus accomplishing a desired coolant mixing effect and increasing the thermal allowance of the fuel rods and accomplishing a high performance fuel assembly. The spacer grid also has a multi-spring structure, consist in of one arc-shaped main spring and two bow-shaped sub-springs. The main spring directly supports the fuel rod within the spacer grid, while the sub-springs have the same radius of curvature as that of the external surface of the fuel rod and effectively support the fuel rod when the main spring fails to support the fuel rod. The spacer grid of this invention thus accomplishes desired soundness of the fuel rods within the fuel assembly during an expected life span of the fuel rods.

摘要翻译： 公开了一种核燃料间隔栅格，其通过与多个栅格条相交并用于在核燃料组件内放置和支撑多个细长的燃料棒而制造。 本发明的间隔栅格在其栅格条上具有多个凹陷叶片。 凹坑叶片被设计成将冷却剂从一个池引导到间隔栅格的相邻单元，从而实现期望的冷却剂混合效果并且增加燃料棒的热容限并实现高性能燃料组件。 间隔网格还具有多弹簧结构，由一个弧形主弹簧和两个弓形副弹簧构成。 主弹簧直接支撑间隔栅格内的燃料棒，而副弹簧具有与燃料棒外表面相同的曲率半径，并且当主弹簧不能支撑燃料棒时有效地支撑燃料棒 。 因此，在燃料棒的期望寿命期间，本发明的间隔栅格实现了燃料组件内的燃料棒的期望的稳定性。

公开(公告)号：US06845138B2

公开(公告)日：2005-01-18

申请号：US10215997

申请日：2002-08-07

申请人： Taehyun Chun ,  Dongseok Oh ,  Wangkee In ,  Keenam Song ,  Hyungkyu Kim ,  Heungseok Kang ,  Kyungho Yoon ,  Younho Jung

发明人： Taehyun Chun ,  Dongseok Oh ,  Wangkee In ,  Keenam Song ,  Hyungkyu Kim ,  Heungseok Kang ,  Kyungho Yoon ,  Younho Jung

IPC分类号： G21C3/34 ,  G21C3/322 ,  G21C3/332

CPC分类号： G21C3/332 ,  Y02E30/40

摘要： A spacer grid with hybrid flow-mixing devices for nuclear fuel bundle is made up of an intersection of a plurality of thin straps at right angles to form a plurality of cells for receiving and supporting fuel rods. Each strap is composed of two types of strap units, called a primary strap unit and a secondary strap unit, which are alternately arranged along the strap. The primary strap unit is a strap section having a primary vane set, and a secondary strap unit is a strap section having a secondary vane set. The straps intersect such that, by primary and secondary strap units, each intersection forms a hybrid flow-mixing device around the top of each junction. The primary vane set, consisting of a trapezoidal primary vane stand and two bent primary mixing vanes on both sides, protrudes upwardly from the strap and is primarily for generating cross flow between channels. Meanwhile, the secondary vane set, consisting of a trapezoidal secondary vane stand and two bent primary mixing vanes on both sides, also protrudes upwardly from the strap, but is primarily for swirl flow generation within the channels. The hybrid flow-mixing device induces a complex but effective flow pattern in flow channels for fuel rod cooling.

摘要翻译： 具有用于核燃料束的混合流动混合装置的间隔栅格由多个薄带的交叉点成直角形成用于接收和支撑燃料棒的多个单元。 每个条带由两种类型的带单元组成，称为主带单元和次级带单元，其沿着带交替布置。 主带单元是具有主叶片组的带部分，并且次级带单元是具有次级叶片组的带部分。 带子相交，使得通过初级和次级带单元，每个交叉点在每个结点的顶部周围形成混合流动混合装置。 主叶片组由梯形主叶片架和两侧的两个弯曲的初级混合叶片组成，从带子向上突出，主要用于在通道之间产生交叉流。 同时，由梯形二级叶片支架和两侧的两个弯曲的主要混合叶片组成的次级叶片组也从带子向上突出，但主要用于在通道内产生涡流。 混合流动混合装置在用于燃料棒冷却的流动通道中引起复杂但有效的流动模式。

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。