公开(公告)号：US09196386B2

公开(公告)日：2015-11-24

申请号：US13648322

申请日：2012-10-10

申请人： KEPCO NUCLEAR FUEL CO., LTD.

发明人： Sang Youn Jeon ,  Jung Min Suh ,  Kyong Bo Eom ,  Joon Kyoo Park ,  Dong Geun Ha ,  Jin Sun Kim ,  Seong Soo Kim ,  Joo Young Ryu ,  Oh Joon Kwon

IPC分类号： G21C3/356 ,  G21C3/322 ,  G21C3/34

CPC分类号： G21C3/356 ,  G21C3/322 ,  G21C3/352 ,  G21C3/3563 ,  G21C2003/3432 ,  Y02E30/38

摘要： Disclosed herein is a spacer grid for a nuclear fuel assembly which is formed from grid strips of an improved structure, thus reducing flow-induced high-frequency vibration. The spacer grid has dimples or grid springs for supporting fuel rods and is formed from a plurality of grid strips assembled in a lattice shape to form lattice cells. Each of the grid strips has at least one slot formed in a planar portion of the grid strip separately from the dimple or grid spring. Therefore, characteristics of the vibration of the spacer grid can be set in a variety of different manners so that flow-induced high-frequency vibration can be reduced.

摘要翻译： 本文公开了一种用于核燃料组件的间隔栅格，其由改进结构的栅格条形成，从而减少流动引起的高频振动。 间隔栅格具有用于支撑燃料棒的凹坑或栅格弹簧，并且由多个栅格条形成，栅格条以格子形状形成以形成晶格单元。 每个格栅条具有至少一个槽，其形成在格栅条的平面部分中，与凹坑或格栅弹簧分开形成。 因此，可以以各种不同的方式设置间隔栅格的振动特性，从而可以降低流动的高频振动。

公开(公告)号：US09171647B2

公开(公告)日：2015-10-27

申请号：US13648312

申请日：2012-10-10

申请人： KEPCO NUCLEAR FUEL CO., LTD.

发明人： Joo Young Ryu ,  Jung Min Suh ,  Sang Youn Jeon ,  Kyong Bo Eom ,  Joon Kyoo Park ,  Dong Geun Ha ,  Jin Sun Kim ,  Seong Soo Kim ,  Oh Joon Kwon

IPC分类号： G21C3/34 ,  G21C3/356 ,  G21C3/322

CPC分类号： G21C3/356 ,  G21C3/322 ,  G21C3/3563 ,  G21C2003/3432 ,  Y02E30/38

摘要： Disclosed herein is a spacer grid for a nuclear fuel assembly. The spacer grid has dimples for supporting fuel rods and is formed from grid strips which are assembled in a lattice shape to form lattice cells. Each grid strip has at least one hole which is formed separately from the dimples. Therefore, when coolant is drawn into the fuel assembly, a pressure difference between opposite sides of the holes is reduced, and friction generated between cut edges of the holes and the coolant reduces the magnitude of the vibration and causes a damping effect, thus reducing flow-induced vibration. The hole formed in the grid strip function to widen the range of the frequency of the flow-induced vibration caused by vortex sheddings formed around the edges of the grid strip, thus reducing the possibility of the generation of resonance with the natural frequency of the spacer grid.

摘要翻译： 本文公开了一种用于核燃料组件的间隔栅格。 间隔栅格具有用于支撑燃料棒的凹坑，并且由栅格条形成，栅格条以栅格形状组装以形成晶格单元。 每个网格条具有至少一个与凹坑分开形成的孔。 因此，当冷​​却剂被吸入燃料组件时，孔的相对侧之间的压力差减小，并且孔的切割边缘与冷却剂之间产生的摩擦力降低了振动的大小并且产生阻尼效应，从而减少了流动 引起的振动。 形成在格栅条中的孔用于扩大由形成在格栅条边缘周围的涡流脱落引起的流动振动频率的范围，从而降低了与间隔物的固有频率产生共振的可能性 格。