公开(公告)号：US4451428A

公开(公告)日：1984-05-29

申请号：US222060

申请日：1981-01-02

申请人： Eiichi Nishimura ,  Shunsuke Uchida ,  Masao Kitamura ,  Koichi Saito ,  Eishi Ibe ,  Tatsuo Hayashi

发明人： Eiichi Nishimura ,  Shunsuke Uchida ,  Masao Kitamura ,  Koichi Saito ,  Eishi Ibe ,  Tatsuo Hayashi

IPC分类号： G21C7/10 ,  G21C7/113 ,  G21C7/24

CPC分类号： G21C7/113 ,  G21Y2002/206 ,  G21Y2004/10 ,  G21Y2004/30 ,  Y02E30/31 ,  Y02E30/39

摘要： A control rod for a boiling-water reactor having blades arranged in the form of a cross in transverse cross section includes a plurality of poison tubes disposed therein. Boron carbide powder which is a neutron absorbing material causing an (n, .alpha.) reaction to take place is charged in the poison tubes. The control rod has plates of Hf-Zr alloy arranged in the blades in a position nearer to a forward end of the control rod at which the control rod is inserted in a reactor core than the poison tubes. The plates of Hf-Zr alloy are formed of an alloy of Hf having a large neutron absorption cross section and Zr having a small neutron absorption cross section. The concentration of Hf in the plates of Hf-Zr alloy is successively reduced in going from an end thereof adjacent the poison tubes toward and end thereof at the inserting end of the control rod. The plates of Hf-Zr alloy and the poison tubes have the same neutron absorbing capacity at the boundary therebetween at which they are in contact with each other.

摘要翻译： 一种沸水反应器的控制棒，其具有以十字横截面形式布置的叶片，其中包括多个设置在其中的毒药管。 将引起（n，α）反应的中子吸收材料的碳化硼粉末装入毒药管中。 控制杆具有在叶片中布置在更靠近控制棒的前端的位置的Hf-Zr合金板，在该位置控制杆插入反应堆芯中而不是毒药管。 Hf-Zr合金的板由具有大的中子吸收截面的Hf的合金和具有小的中子吸收截面的Zr形成。 Hf-Zr合金板中Hf的浓度从控制棒插入端的毒药管附近的端部朝向其末端逐渐减小。 Hf-Zr合金板和毒药管在它们彼此接触的边界处具有相同的中子吸收能力。

公开(公告)号：US5084235A

公开(公告)日：1992-01-28

申请号：US554158

申请日：1990-07-19

申请人： Eishi Ibe ,  Hidetoshi Karasawa ,  Maroto Nagase ,  Masaharu Sakagami ,  Shunsuke Uchida ,  Minoru Miki ,  Yamato Asakura ,  Motoaki Utamura ,  Fumio Kawamura ,  Katsumi Ohsumi ,  Yoshinori Chiba

发明人： Eishi Ibe ,  Hidetoshi Karasawa ,  Maroto Nagase ,  Masaharu Sakagami ,  Shunsuke Uchida ,  Minoru Miki ,  Yamato Asakura ,  Motoaki Utamura ,  Fumio Kawamura ,  Katsumi Ohsumi ,  Yoshinori Chiba

IPC分类号： G21C1/08 ,  G21C19/30

CPC分类号： G21C19/30 ,  G21C1/084 ,  Y02E30/31

摘要： A direct cycle type atomic power plant provided with a means for suppressing transfer of radioactive nitrogen compounds generated by nuclear reaction in the core from the reactor water to steam, where an increase in the dose rate in the main steam system and the turbine system due to carry-over of radioactive nitrogen atom, .sup.16 N, generated in the core can be suppressed, and the radioactivity therein can be reduced.

摘要翻译： 一种直接循环型原子能发电厂，其设置有用于抑制由核反应堆中的核反应产生的放射性氮化合物从反应器水转移到蒸汽的装置，其中主蒸汽系统和涡轮系统中的剂量率由于 可以抑制在核心中产生的放射性氮原子16N的转移，并且可以降低其中的放射性。