摘要:
A fuel assembly includes a plurality of fuel rods (4), fuel spacers (5) for securing the gaps between the fuel rods and a channel box (6). The channel box includes a) spacer support means (18) projecting inward and supporting the fuel spacer (15) in a transverse direction and b) creep deformation inhibition means (17) disposed at the lower end portion of the channel box and projecting inward The distance between the spacer support means (18) disposed to oppose one another in a horizontal direction is smaller than the distance between the creep deformation inhibition means (17) opposing one another in the horizontal direction.