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2. 发明授权

US6141396A Initial loading core 有权
标题翻译：初始加载核心
公开(公告)号：US6141396A
公开(公告)日：2000-10-31
申请号：US254183
申请日：1999-03-02
申请人： Akiko Kanda , Katsumasa Haikawa , Akihiro Yamanaka , Kenmi Narita , Junichi Yamashita , Junichi Koyama
发明人： Akiko Kanda , Katsumasa Haikawa , Akihiro Yamanaka , Kenmi Narita , Junichi Yamashita , Junichi Koyama
IPC分类号： G21C3/326 , G21C5/02
CPC分类号： G21C5/02 , G21C3/326 , Y02E30/38
摘要： Several unit loading patterns are arranged in the central area of an initial core to which the present invention is applied. The unit loading pattern is composed of one square-shaped unit cell and four cross-shaped control rods 3 which surround the unit cell. The unit cell is composed of one low enrichment fuel assembly 7, two high enrichment fuel assemblies 8 and one high enrichment fuel assembly 9. The low enrichment fuel assemblies 7 of each unit loading pattern adjoin each other and are arranged to constitute the first control cell 2a being square-shaped. The high enrichment fuel assemblies 9, obliquely adjoining the low enrichment fuel assembly 7 in each unit loading pattern, adjoin each other and are arranged to constitute the second control cell 2b being square-shaped. The high enrichment fuel assembly 9 constituting the unit loading pattern is divided into a control rod side area and an anticontrol rod side area by a diagonal line L1, and the number of Gd fuel rods in the control rod side area is 2 or more than the number in the anticontrol rod side area. By providing this structure, the increase of the local peaking factor on the control rod side can be suppressed and the thermal margin can be sufficiently secured, even if the control rod 3 of the second control cell 2b is extracted after the second operation cycle.
摘要翻译： PCT No.PCT / JP96 / 02501 Sec。 371日期1999年3月2日 102（e）1999年3月2日PCT PCT 1996年9月4日PCT公布。公开号WO98 / 10426 日期1998年3月12日几个单元加载模式布置在应用本发明的初始核心的中心区域中。单元加载模式由一个方形单位单元和围绕单位单元的四个十字形控制杆3组成。单元电池由一个低浓度燃料组件7，两个高浓缩燃料组件8和一个高浓缩燃料组件9组成。每个单元装载模式的低浓缩燃料组件7彼此邻接并且被布置成构成第一控制单元 2a为方形。在每个单元装载模式中与低浓缩燃料组件7倾斜相邻的高浓缩燃料组件9相互邻接并被布置成构成正方形的第二控制单元2b。构成单元装载图案的高浓缩燃料组件9通过对角线L1分为控制棒侧区域和反向推杆侧面区域，控制棒侧区域中的Gd燃料棒的数量为2个以上抗电极杆侧面的数量。通过提供这种结构，即使在第二操作周期之后提取第二控制单元2b的控制棒3，也可以抑制控制棒侧的局部峰值系数的增加，并且可以充分确保热裕度。

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