ACTIVE ZONE, FUEL ELEMENTS AND FUEL ASSEMBLY OF FAST NEUTRON REACTORS WITH LEAD HEAT CARRIER

摘要

FIELD: power industry.SUBSTANCE: active zone of the reactor, fuel elements and fuel assembly for its implementation are intended for use in fast neutron reactors with nitride fuel and liquid metal heat carrier, mainly as melted lead and its alloys. The active zone contains two parts - central and peripheral. Zones are formed by the assemblies containing fuel elements with geometrically identical shells, but with different heights of a fuel column in fuel elements of the central and peripheral parts. The radial fuel distribution by the volume of the active zone is characterised in longitudinal section by U-shaped form. Diameter of the central part of the active zone at a weight share of fuel ?> 0,305 amounts from 0.4 to 0.5 of the effective diameter of the active zone, and the height of the fuel column in fuel elements of the fuel assembly of the central part amounts from 0.5 to 0.8 from the height of the fuel column in fuel elements placed in fuel assemblies of the peripheral part of the active zone.EFFECT: simplicity of design of an active zone with negative hollow effect of reactivity.6 cl, 2 dwg