Patent ID: 6516043
Filing Date: 2003-02-04
Classification: G21C,Y02E

Abstract:
A fuel assembly comprising:a plurality of fuel rods placed in a square lattice array of n-rows/n-columns (n: integer); at least one water rod placed in a region in which one or more of said fuel rods can be placed; a lower tie plate for supporting the lower end of a fuel bundle composed of said plurality of fuel rods and said at least one water rod; and a guide post provided for fixing a channel fastener; wherein said integer n is set at n=10; the fuel rod pitch of said plurality of fuel rods is in a range of 12.65 mm to 13.15 mm; and means for offsetting and holding said fuel bundle is provided in such a manner that the center in a cross section of said fuel bundle is offset from the center in a cross section of said lower tie plate toward said channel fastener side, the center in a cross section of said lower tie plate being equal to the center in a cross section of a channel box for covering said fuel bundle.