NUCLEAR REACTOR FUEL ASSEMBLY

摘要

FIELD: no-can fuel assemblies for cores of pressurized-water reactors. SUBSTANCE: fuel assembly has zirconium guide tubes fixed on bottom tip and provided with steel intermediate bushings rigidly fixed in top part. Each intermediate bushing has step supporting bottom spring-loaded bushing ; upper end of spring is pressed on top with upper bushing whose upward displacement is limited by stop nut turned onto intermediate bushing and locked thereon. Springs and supporting bushings are placed between bottom and top slabs of upper tip; stop nut diameter is smaller than diameter of respective hole in upper slab. EFFECT: improved reliability of fuel assembly and safety of reactor core, improved economic efficiency of fuel cycle due to better fuel burnout. 6 dwg