发明名称 |
Initial core and fuel assembly |
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.
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申请公布号 |
US5781604(A) |
申请公布日期 |
1998.07.14 |
申请号 |
US19960727008 |
申请日期 |
1996.10.08 |
申请人 |
HITACHI, LTD. |
发明人 |
HAIKAWA, KATSUMASA;YAMANAKA, AKIHIRO;KANDA, AKIKO;AOYAMA, MOTOO;YUCHI, YOKO;YAMASHITA, JUNICHI |
分类号 |
G21C5/12;G21C3/32;G21C3/326;G21C3/328;G21C3/62;G21C5/00;G21C5/02;G21C7/113;(IPC1-7):G21C3/00 |
主分类号 |
G21C5/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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