公开(公告)号：US5280508A

公开(公告)日：1994-01-18

申请号：US18476

申请日：1993-02-16

申请人： Bob Y. Okashima ,  Gary I. Borchardt ,  Peter A. Peterson ,  Russell P. Higgins

发明人： Bob Y. Okashima ,  Gary I. Borchardt ,  Peter A. Peterson ,  Russell P. Higgins

IPC分类号： G21C3/10 ,  G21C3/326 ,  G21C3/335 ,  G21C19/105 ,  G21C19/19 ,  G21C19/10

CPC分类号： G21C3/335 ,  G21C19/105 ,  G21Y2002/202 ,  G21Y2002/206 ,  G21Y2002/302 ,  G21Y2002/401 ,  G21Y2004/30 ,  G21Y2004/501 ,  Y02E30/40

摘要： A part length fuel rod tip and group of tip grasping tools is set forth for the removal, inspection and replacement of part length fuel rods from a fuel bundle having a part length rods interspersed with a majority of conventional full length rods. The part length fuel rod tip includes a longitudinal keyway allowing torque to be exerted on the fuel rod and a horizontal slot enabling grasping of the fuel rod for vertical withdrawal and replacement movement of the fuel rod. The tools include a torque socket for applying high torque forces to the part length rod for unscrewing the rod when the rod becomes stuck at its threaded connection to the lower tie plate, a tip grasping tool for permitting normal unscrewing torque and grasping for vertical withdrawal and replacement, and finally a tool having both high torque and grasping characteristics. In each case, the diameter of the tools is restricted to enable access to the part length fuel rods through the spacers overlying the upwardly exposed ends of the part length fuel rods.

摘要翻译： 提出了一部分长度的燃料棒尖端和一组尖端抓取工具，用于从具有散布有大多数常规全长杆的部分长度棒的燃料束移除，检查和更换部分长度的燃料棒。 部件长度燃料棒末端包括允许施加在燃料棒上的扭矩的纵向键槽和能够抓住燃料棒的水平槽，用于燃料棒的垂直取出和更换运动。 这些工具包括一个转矩插座，用于当杆被卡在与下连接板的螺纹连接处时，向部件长度杆施加高扭矩力，用于旋转杆;尖部抓取工具，用于允许正常的旋松扭矩和抓取用于垂直取出; 更换，最后是具有高转矩和抓取特性的工具。 在每种情况下，工具的直径被限制以使得能够通过覆盖部件长度燃料棒的向上暴露的端部的间隔件接近部件长度的燃料棒。

公开(公告)号：US5135711A

公开(公告)日：1992-08-04

申请号：US715516

申请日：1991-06-14

申请人： Gary I. Borchardt ,  Larry E. Fennern ,  Wayne Marquino

发明人： Gary I. Borchardt ,  Larry E. Fennern ,  Wayne Marquino

IPC分类号： G21C15/02 ,  G21C1/08 ,  G21C15/18 ,  G21C15/243 ,  G21C15/26

CPC分类号： G21C15/26 ,  G21C15/18 ,  G21C15/243 ,  G21C1/084 ,  G21Y2002/207 ,  G21Y2004/302 ,  G21Y2004/402 ,  Y02E30/31

摘要： A BWR coolant recirculation system includes a pump deck disposed in a downcomer and fixedly joined to a reactor pressure vessel and reactor core shroud. A plurality of circumferentially spaced reactor internal pumps (RIPs) are joined to the deck and operable in a pumping mode for pumping downwardly a reactor coolant from the downcomer and into a core inlet. In a pump inoperable mode, a portion of the coolant bypasses the RIPs for allowing increased natural recirculation of the coolant from the downcomer and into the core inlet.