NUCLEAR REACTOR FUEL ASSEMBLY

The invention is related to the nuclear power industry sphere, specifically to the design of fuel assemblies of nuclear reactors, and is aimed at supporting efficient mixing of the heat carrier.The nuclear reactor fuel assembly with the cross-section in the form of equilateral hexagon contains upper and lower end caps, guide channels, fuel elements situated in triangular network points, and at least one array consisting of cells integrally connected in between, made in polyhedral tube form, whose longitudinal axis coincides with the longitudinal axis of the fuel element. Six non-adjacent edges of the cell are made inclined on account of changing the edge width along the cell axis. Edges parallel to the fuel assembly axis, with cells adjacent to each other thereby, are located between inclined edges. Cells in this case are situated in the array in rows parallel to one of main diagonals of the regular hexagon. One pair of opposite inclined edges has edge width from the upper end cap side smaller than edge width from the lower end cap side. The cell centerline crossing these edges makes an angle of 30 degrees with the aforementioned diagonal. Remaining inclined edges has edge width from the upper end cap side greater than edge width from the lower end cap side. Cells of each row have similar orientation and centerlines of cells in adjacent rows form an angle of 60 degrees.The width of inclined cell edges is changing along the cell axis in a way that the cell cross-section area is constant along its axis.The invention makes it possible to reduce irregularity of heat carrier parameters in the fuel assembly and increase the reactor capacity on account of increasing margins to critical parameters of heat carrier.