Patent ID: 6885722
Filing Date: 2005-04-26
Classification: G21C,Y02E

Abstract:
1. A fuel assembly for being loaded into a reactor core wherein a control rod-side water gap width and an opposite-side water gap width are almost equal to each other, comprising: a fuel bundle having a plurality of fuel rods arranged in a square lattice pattern and at least one neutron moderator rod, each fuel rod being filled with nuclear fuel pellets, distances between adjacent fuel rods are almost the same; an upper tie plate and a lower tie plate holding upper end portions and lower end portions of said fuel rods respectively; and means for fixing a channel box covering said fuel bundle to one corner of said upper tie plate by a channel fastener, a center of said at least one neutron moderator rod being shifted toward said one corner, away from a cross sectional center of the fuel assembly; wherein said plurality of fuel rods include a plurality of burnable absorber-filled fuel rods having burnable absorber added thereto, the number of said burnable absorber-filled fuel rods being arranged in one diagonally divided half area opposite to said one corner is larger than that in the other diagonally divided half area.