| abstract |
(57) [Summary] [Purpose] MA nuclides (Np, Am, C) in high-level waste m) is used to provide a fuel assembly that can be efficiently converted to another substance that is likely to undergo fission or has a short half-life. In a fuel assembly in which a plurality of fuel rods having a nuclear fuel material inserted in a fuel cladding tube are arranged to form a fuel bundle, the fuel rods are Np, Am, Cm extracted from spent fuel in the nuclear fuel material. Of at least one element of the fuel rod, and the amount of the element is larger in the upper region 1 than in the lower region 2 of the fuel rod. |