| 摘要 |
Provided is a fuel assembly that, even for fuel rods using a low-strength cladding tube material, is highly safe even if dropped during transfer. A fuel assembly (10) in which a plurality of fuel rods (13) accommodating fuel pellets are arranged in the form of a grid inside a rectangularly cylindrical channel box (16), the top and bottom ends of the plurality of fuel rods (13) being supported, respectively, by an upper tie plate (11) and a lower tie plate (12), wherein the fuel cladding tubes constituting the fuel rods (13) are formed of a low-strength material, and a mesh part formed in the lower tie plate (12) and provided with a plurality of openings admitting cooling water is formed of a constituent material having a room-temperature-proof strength of 490 MPa or more, and the axial height of the mesh section is 15 mm or more. |
