Fuel assembly

An obstacle capturing filter interposed between a support lattice and a lower nozzle is constituted by recessing the outer lateral surface of short circular tubes at the outermost edge, among the short circular tubes surrounding a lower end plug of a fuel rod. Since the filter is easily fabricated, it can be manufactured at a reduced cost, and since it forms an obstacle capturing space being isolated from fuel rod cladding tube while allowing thermal expansion and irradiation growth of fuel rods, fretting corrosion of the fuel rod cladding tube caused by obstacles can reliably be prevented. In addition, the wall of the circular tubes as the obstacle capturing filter can be formed thinly, pressure drop of coolant's flow passing therethrough is not increased, and since the outside of the circular tubes at the outer edge is recessed, access thereto can be facilitated in order to detect the amount of the irradiation growth of fuel rods. (N.H.)