FIELD: reactors. SUBSTANCE: fuel assemblies are used in quick sodium reactor with uranium plutonium fuel. The assemblies have through sodium cavity for the height of active zone. Both edges screen have diameters of 0.3-0.8 effective diameter of fuel assembly. Neutron leakage is a result of operation from active zone to edge reflectors. As a result sodium hollow effect of reactivity is reduced. EFFECT: improved efficiency. 5 cl, 2 dwg
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