公开(公告)号：US20120148012A1

公开(公告)日：2012-06-14

申请号：US12019103

申请日：2008-01-24

申请人： Takayuki ARAKAWA ,  Koichi Machida ,  Norio Kawashima ,  Kazuki Kobayashi ,  Yoshiharu Kikuchi

发明人： Takayuki ARAKAWA ,  Koichi Machida ,  Norio Kawashima ,  Kazuki Kobayashi ,  Yoshiharu Kikuchi

IPC分类号： G21C7/06

CPC分类号： G21C7/113 ,  G21C7/10 ,  Y02E30/39

摘要： A control rod includes a tie-rod, a handle mounted to an upper end portion of the tie-rod, either a connector plate or a fall velocity limiter mounted to a lower end portion of the tie-rod, sheaths having a U-shaped cross-section, welded intermittently to the tie-rod at a plurality of locations in the axial direction of the tie-rod, and having an upper end welded to the handle and a lower end welded to either the connector plate or the fall velocity limiter, and a neutron absorbing member disposed inside each of the sheaths. An upper end of a weld portion located at uppermost position in an axial direction of the tie-rod among a plurality of weld portions between the tie-rod and the sheath is disposed at a position within a range between 0.8 and 13% of total axial length Ls of the sheath below an upper end of the sheath.

摘要翻译： 控制杆包括拉杆，安装到拉杆的上端部分的手柄，安装到拉杆的下端部分的连接板或下落速度限制器，具有U形的护套 横截面，在连杆的轴向方向上的多个位置处间断地焊接到拉杆，并且具有焊接到手柄的上端，以及焊接到连接器板或下落速度限制器的下端 以及设置在每个护套内的中子吸收构件。 位于拉杆和护套之间的多个焊接部分中的位于拉杆的轴向方向上的最上位置处的焊接部分的上端设置在总轴向的0.8和13％之间的范围内的位置 在鞘的上端下方的鞘的长度Ls。