Nuclear reactor fuel assebmblies

摘要

A fuel rod 58 for a nuclear reactor 22 includes the fuel rod 58 having a first axial zone positioned proximate to a bottom end, a second axial zone positioned adjacent to the first axial zone in the intermediate region, and a third axial zone positioned proximate to a top end. The first axial zone has an enrichment greater than the second axial zone and the second axial zone has an enrichment greater than or equal to the third axial zone. Also includes fuel assemblies 42 having a plurality of fuel rods 58 and methods of designing and manufacturing of fuel rods 58 and fuel assemblies 42.