POWER REACTOR FUEL ASSEMBLY Russian patent published in 2003 - IPC

FIELD: nuclear power engineering; collapsible fuel assemblies with cap screwed to top and/or bottom nozzle. SUBSTANCE: fuel assembly mainly designed for VVER-440 reactors has cap secured to at least one end piece with aid of taper-head screws. End pieces are provided with conical depressions and conical holes on cap seats to receive screw head. Angle between cone generating line and outer surface of end piece of cap is between 2^°45′ and 3^°45′. Diameter D of depression at point of its intersection with outer surface of end piece is 1.82d to 2.37d, where d is maximal diameter of screw head. Proposed design enables mounting and dismounting of end pieces without deformation of can edges and seizure between peripheral fuel assemblies and inner surface of can during their removal from assembly. EFFECT: simplified design, facilitated manufacture of fuel assembly. 5 cl, 3 dwg