摘要 |
PROBLEM TO BE SOLVED: To reduce the kinds of fuel particles, to enhance the filling ratio, to improve a yield, and to reduce a manufacturing cost. SOLUTION: The atomic reactor fuel rod forms a fuel area 16 of a predetermined fuel density by loading fuel particles in a cladding tube 10, and applying oscillation thereto, and seals both ends of the cladding tube by end plugs 18 and 20. The fuel particles loaded in the cladding tube consist of spherical fuel particles and monolithic lump-shaped fuel particles. The grain size of the spherical fuel particles is larger than the grain size of the monolithic lump-shaped fuel particles, and both kinds of fuel particles are mixed in a substantially uniform manner. For example, there are two kinds, i.e., spherical fuel particles 30 of large grain size and monolithic lump-shaped fuel particles 34 of small grain size. The grain size of spherical fuel particles is 700-1,000μm, and the grain size of monolithic lump-shaped fuel particles is≤100μm, and the charging ratio of spherical fuel particles is 50-70 wt.%. COPYRIGHT: (C)2004,JPO
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