Nuclear fuel assembly, positioning grid, and strip

Abstract

The invention relates to a nuclear fuel assembly, a positioning grid and a strip. The strip comprises a main strip body and a spring arranged on the strip body, wherein the spring comprises an elastic contact part protruding from a plane where the main strip body is located, two connecting parts arranged on two ends of the elastic contact part and extending towards the main strip body, and two supporting parts respectively connected with the connecting parts; the supporting parts are separately connected with the main strip body; and the strip further comprises flow-passing parts arranged on the supporting parts or arranged at positions close to the supporting parts. Since the flow-passing parts are arranged on the strip at positions close to the supporting parts of the spring or directly on the supporting parts of the spring, the flow blocking area of the spring can be reduced, and thus, the pressure loss of the positioning grid can be reduced; moreover, the stiffness of the spring may be reduced, so the elastic clamping force of the spring is improved and flexible clamping of a fuel rod is better facilitated.

Description

technical field [0001] The invention relates to the technical field of nuclear power, in particular to a nuclear fuel assembly, a positioning grid and a spring. Background technique [0002] A nuclear reactor is a chain nuclear fission reaction through artificial control of fissile substances, which is used to generate heat, etc., and generate electricity. [0003] In existing nuclear reactors, nuclear fuel is usually processed into fuel rods, which are combined with control rods and installed in positioning grids to form nuclear fuel assemblies. Usually, the positioning grid includes several strips 3, and the strips 3 are intersected on the same horizontal plane to form a plurality of cells. Fuel rods, control rods, etc. are installed in corresponding cells to form an integral nuclear fuel assembly. [0004] In order to clamp the fuel rods in the positioning grid, springs 1 are usually installed in the grid cells in the prior art, and the fuel rods are clamped in the grid...

AI Technical Summary

Problems solved by technology

The spring 1 is directly connected to the main body of the strip, and the cooling fluid flows through the slit 5 on the spring 1, the gap between the rigid protrusion and the main body of the strip, and since the connection between the spring 1 and the main body of the strip is closed A larger closed area is formed, and the pressure drop increases, which is not conducive to the flow and heat transfer of the cooling fluid

Moreover, the rigidity of the connection between the spring 1 and the strip main body is relatively high, which is not conducive to the flexible clamping of the fuel rod by the spring 1

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