公开(公告)号：US6005905A

公开(公告)日：1999-12-21

申请号：US664663

申请日：1996-06-17

申请人： Akihiro Yamanaka ,  Katsumasa Haikawa ,  Akiko Kanda ,  Takaaki Mochida ,  Junichi Yamashita ,  Motoo Aoyama ,  Yoko Yuchi ,  Junichi Koyama

发明人： Akihiro Yamanaka ,  Katsumasa Haikawa ,  Akiko Kanda ,  Takaaki Mochida ,  Junichi Yamashita ,  Motoo Aoyama ,  Yoko Yuchi ,  Junichi Koyama

IPC分类号： G21C3/30 ,  G21C3/326 ,  G21C3/328 ,  G21C3/62 ,  G21C5/00 ,  G21C7/02 ,  G21C19/00

CPC分类号： G21C5/00 ,  G21C7/02 ,  G21Y2002/201 ,  G21Y2004/30 ,  G21Y2004/402 ,  Y02E30/39

摘要： In an arrangement of an initial core, the core is loaded with 572 high enrichment fuel assemblies H with 4.2 wt % average enrichment and 300 low enrichment fuel assemblies L with 1.5 wt % average enrichment. The average enrichment of the core is about 3.3 wt %. In this core, only the low enrichment fuel assemblies are loaded into the most outer position of the core and the high enrichment fuel assemblies are loaded into an area other than the most outer position. In this arrangement, the average enrichment of reload fuel assemblies is 3.7 wt %.

摘要翻译： 在初始核心的布置中，核心装载有572个高浓缩燃料组件H，4.2重量％的平均浓缩物和300个低富集燃料组件L，具有1.5重量％的平均富集度。 核心的平均富集度约为3.3重量％。 在该核心中，只有低浓度燃料组件被装载到核心的最外部位置，而高浓缩燃料组件被装载到除了最外部位置之外的区域中。 在这种布置中，重新加载燃料组件的平均富集为3.7重量％。

公开(公告)号：US5781604A

公开(公告)日：1998-07-14

申请号：US727008

申请日：1996-10-08

申请人： Katsumasa Haikawa ,  Akihiro Yamanaka ,  Akiko Kanda ,  Motoo Aoyama ,  Yoko Yuchi ,  Junichi Yamashita

发明人： Katsumasa Haikawa ,  Akihiro Yamanaka ,  Akiko Kanda ,  Motoo Aoyama ,  Yoko Yuchi ,  Junichi Yamashita

IPC分类号： G21C5/12 ,  G21C3/32 ,  G21C3/326 ,  G21C3/328 ,  G21C3/62 ,  G21C5/00 ,  G21C5/02 ,  G21C7/113 ,  G21C3/00

CPC分类号： G21C5/02 ,  G21C3/328 ,  Y02E30/38

摘要： In an initial core of the present invention, a low enrichment fuel assembly having the lowest average enrichment factor and three fuel assemblies having a higher average enrichment factor than that of the low enrichment fuel assembly are arranged in a square shape, control rods of a cross shape are arranged at each of four corners of the square shape to constitute a unit loading pattern, and a plurality of the unit loading patterns are provided in the central region of the core, the fuel assemblies having the higher average enrichment factor are divided by a diagonal line into a first region of the side of the control rods and a second region of the side opposite to the control rods, and the number of the gadolinia-containing fuel rods is greater in the second region by at least two than in the first region. The initial core having an enhanced average enrichment factor for accomplishing a high exposure, makes it possible to maintain thermal margin, to suitably suppress the excess reactivity and to improve fuel economy.

摘要翻译： 在本发明的初始核心中，具有最低平均富集因子的低富集燃料组件和具有比低浓度燃料组件更高的平均富集因子的三个燃料组件布置成正方形，十字形控制棒 形状被布置在方形的四个角中的每一个角上以构成单元加载模式，并且在芯的中心区域中设置多个单元加载模式，具有较高平均富集因子的燃料组件被除以 对角线插入到控制棒的一侧的第一区域和与控制棒相对的一侧的第二区域，并且含氧化钆的燃料棒的数量在第二区域中比在第一区域中的至少两个更大 地区。 具有增强的平均富集因子的初始核心用于实现高暴露，使得可以保持热裕度，以适当地抑制过量反应性并提高燃料经济性。