SPACER GRIDS HAVING SHIFTED SUPPORTING LOCATIONS FOR THE FUEL RODS WITH NARROW GAPS

摘要

A supporting grid body having a moved support point of a nuclear fuel rod for supporting the nuclear fuel rod of a nuclear energy aggregate loaded into a nuclear reactor is presented to increase exchangeability with components of the nuclear fuel aggregate, by using a top fixing portion and a bottom fixing portion without changing the position of a guide tube in the nuclear fuel aggregate. A supporting grid body of a nuclear fuel rod(10) is assembled with a number of unit grid plates. The unit grid plate comprises a supporting portion(23) supporting the nuclear fuel rod arranged in a narrow interval. The supporting portion moves toward the center of a sub channel from a longitudinal center line.