Perforated plate support for dual-cooled segmented fuel rod

A nuclear fuel assembly comprising:

• a perforated plate support, which supports dual-cooled fuel rods, each of which has concentric outer and inner tubes and is coupled with upper and lower end plugs at upper and lower ends thereof, and guide thimbles, each of which is used as a passage for a control rod,
• wherein the perforated plate support is formed as a support plate having the shape of a flat plate, which includes internal channel holes, each of which has a diameter corresponding to an outer diameter of the inner tube, guide thimble holes, each of which has a diameter corresponding to an outer diameter of the guide thimble, and sub-channel holes around each internal channel hole,
• wherein the upper or lower end of the dual-cooled fuel rod is coupled to the support plate such that the outer diameter of the inner tube is matched with the diameter of the internal channel hole,
• and wherein the internal channel holes are arranged in such a manner that lines extending from centers of the neighboring ones of the internal channel holes form square grids, and the sub-channel holes are disposed in centers of the square grids, respectively.