公开(公告)号：US4655999A

公开(公告)日：1987-04-07

申请号：US622727

申请日：1984-06-20

申请人： Hiromi Maruyama ,  Tadahiro Ohnishi

发明人： Hiromi Maruyama ,  Tadahiro Ohnishi

IPC分类号： G21C7/113 ,  G21C7/10

CPC分类号： G21C7/113 ,  G21Y2002/201 ,  G21Y2002/206 ,  G21Y2004/10 ,  G21Y2004/30 ,  G21Y2004/304 ,  Y02E30/39

摘要： A control rod for a nuclear reactor according to the present invention is such that neutron absorbing rods are surrounded with a second neutron absorber which differs in material from the neutron absorbing rods. In a case where the neutron absorbing rod is composed of boron carbide powder and a cladding for receiving the powder therein, the second neutron absorber is a sheet of a material having a neutron irradiation lifetime longer than that of boron carbide, for example, hafnium. In a case where the neutron absorbing rod is a round hafnium rod, the second neutron absorber having a neutron absorption worth higher than that of hafnium is located so as to surround the round hafnium rods. Thus, the neutron absorbing rods are effectively used, and the lifetime of the control rod can be prolonged in the former.

摘要翻译： 根据本发明的用于核反应堆的控制棒是这样的，即中子吸收棒被与中子吸收棒材料不同的第二中子吸收器包围。 在中子吸收棒由碳化硼粉末和用于接收粉末的包层构成的情况下，第二中子吸收体是具有比碳化硼例如铪的中子照射寿命长的材料的片材。 在中子吸收棒是圆形铪棒的情况下，具有比铪高的中子吸收的第二中子吸收体被定位成围绕圆形铪棒。 因此，有效地使用中子吸收棒，并且可以在前者中延长控制棒的寿命。

公开(公告)号：US4851181A

公开(公告)日：1989-07-25

申请号：US123542

申请日：1987-11-20

申请人： Renzo Takeda ,  Kanji Kato ,  Tadahiro Ohnishi ,  Sadao Uchikawa ,  Hiromi Maruyama ,  Motoo Aoyama ,  Kikuo Umegaki ,  Yasunori Bessho ,  Motomasa Fuse ,  Michiro Yokomi

发明人： Renzo Takeda ,  Kanji Kato ,  Tadahiro Ohnishi ,  Sadao Uchikawa ,  Hiromi Maruyama ,  Motoo Aoyama ,  Kikuo Umegaki ,  Yasunori Bessho ,  Motomasa Fuse ,  Michiro Yokomi

IPC分类号： G21C5/12 ,  G21C1/08 ,  G21C3/328 ,  G21C5/00 ,  G21C5/18

CPC分类号： G21C5/18 ,  Y02E30/40

摘要： In a light water moderation type nuclear reactor with the once-through method, the reactor core is divided into a central area and a peripheral area by a partition member, a first fuel assembly is arranged in the central area (high conversion area) and a second fuel assembly is arranged in the peripheral area. The ratio (r.sub.H/U) of the number of hydrogen atoms to that of uranium atoms in the central area is smaller than that of the ratio in the peripheral area and the second fuel assembly in the peripheral area is formed of fuel rods of the first fuel assembly having been previously burned in the central area and moved into the peripheral area. The plutonium production increases and uranium consumption is reduced during the first half of the lifetime of the fuel rods in the high conversion area with the take-up burn up increasing during the second half of the lifetime of the fuel rods in the burner area.

摘要翻译： 在具有一次通过方法的轻水调节型核反应堆中，反应堆堆芯通过分隔构件分成中心区域和周边区域，第一燃料组件布置在中心区域（高转化区域）和 第二燃料组件布置在周边区域中。 中心区域的氢原子数与铀原子数的比值（rH / U）小于外围区域的比例，并且周边区域中的第二燃料组件的比率（rH / U）由第一 燃料组件先前已经在中心区域燃烧并移动到周边区域。 在高转化率区域的燃料棒的寿命的前半期，钚的生产增加，铀的消耗减少，在燃烧器区域的燃料棒的寿命的后半期，吸收燃烧增加。