Hooking test device of location grids of reactor fuel assembly

Abstract

The invention discloses a hooking test device of location grids of a reactor fuel assembly. The hooking test device comprises a frame base plate, a frame top plate and a vertical column which is connected between the frame base plate and the frame top plate, wherein a horizontal moving assembly is mounted on the frame base plate; a vertical moving assembly is mounted on the frame top plate. Through using the hooking test device, two grids are mounted on the horizontal moving assembly and the vertical moving assembly respectively; due to the movement of the horizontal moving assembly, a transverse force in the horizontal direction between the grids can be tested; due to the movement of the vertical moving assembly, vertical stress of the grids can be tested, so that an experiment of a hooking state between the grids can be simulated, and the goal of testing the grids can be achieved.

Description

technical field [0001] The invention relates to an out-of-reactor test device for a reactor fuel assembly positioning grid, in particular to a hooking test device for a reactor fuel assembly positioning grid. Background technique [0002] Nuclear power plant reactor fuel assemblies are composed of fuel rods, upper nozzle parts, lower nozzle parts, end grids, mixing grid parts, guide tube parts, flux measuring tubes, etc. There are multi-layer positioning grids on the fuel assembly. The spacer grid is welded on the guide pipe, and the fuel rod is fixed by the internal spring to form a fuel assembly. The integrity of the spacer grid directly affects the safety of the fuel assembly. During the loading and refueling process of existing nuclear power plant reactor fuel assemblies, adjacent fuel assembly positioning grids were damaged due to mutual hooking. After the hooking occurred, the fuel assembly positioning grids were damaged, and the assembly could no longer be used direct...

AI Technical Summary

Problems solved by technology

During the loading and refueling process of existing nuclear power plant reactor fuel assemblies, adjacent fuel assembly positioning grids were damaged due to mutual hooking. After the hooking occurred, the fuel assembly positioning grids were damaged, and the assembly could no longer be used directly. , not only affects the economics of the nuclear power plant, but also affects the safety of the nuclear power plant operation when the positioning grid is damaged but not found. Therefore, the anti-hook performance of the fuel assembly positioning grid is directly related to the reliability of component stacking and refueling. The operability and structural integrity of the fuel assembly are of paramount importance to the safety of the fuel assembly

[0003] At present, there is no research on the hooking test of the fuel assembly positioning grid in China, so there is no such test device in China. During the development of the fuel assembly in France, the hooking test of the positioning grid has been carried out. The device used is based on the material Some auxiliary devices are added to the testing machine. There is no special test device specially designed for the hook test of the positioning grid, and the French test device cannot measure the lateral preload force between the two grids, set and measure the included angle, and the two grids. Angle setting between racks

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