NUCLEAR REACTOR FUEL ASSEMBLY Russian patent published in 2005 - IPC

FIELD: nuclear power engineering; fuel assemblies for pressurized-water reactors.

SUBSTANCE: proposed fuel assembly has bottom nozzle carrying guide channels, bundle of fuel elements mounted in spacer grids, and removable top nozzle. The latter has upper plate and lower plate with holes which are mounted on guide channels passing through mentioned holes. Guide bushings are provided with collets and face-to-face mounted through inner steps in butt ends of external projections of guide channels. Springs are installed between upper plate and supporting members made on guide bushings. Collets are provided on upper ends of guide bushings and have upper stops and internal bosses engaging external drillings on upper ends of guide channels. Guide bushings are provided with stops to limit downward displacement of mentioned bushings relative to lower plate.

EFFECT: enhanced reliability and facilitated manufacture of fuel assemblies.

1 cl, 8 dwg