Nuclear fuel subassembly video detection method and detection device

Abstract

The invention discloses a nuclear fuel subassembly video detection method. The nuclear fuel subassembly video detection method comprises following steps: (1) distance calibration in a photographed area is carried out, and nuclear fuel subassembly video images are collected; (2) the video images are processed, displayed, and stored, two calibration points of distance calibration in the video images are determined, and a measuring area in the video images is acquired; (3) the size of the measuring area is calculated, wherein actual calibration distance Lb between the two calibration points is acquired, image calibration distance Np between the two calibration points in the video images is calculated, image defect size Nc in the measuring area in the video images is calculated, and actual defect size Lc of the measuring area is calculated and stored based on the actual calibration distance Lb, the image calibration distance Np, and the image defect size Nc. The nuclear fuel subassembly video detection method can be used for observing situations of nuclear fuel subassemblies via video images, calculating defect size in the nuclear fuel assemblies, accurately determining that whether deformation of the nuclear fuel subassemblies is caused, and determining deformation degree accurately.

Description

technical field [0001] The invention relates to the field of nuclear power generation, in particular to video detection of nuclear fuel assemblies in nuclear power stations. Background technique [0002] The nuclear fuel assembly is composed of nuclear fuel rods, nuclear fuel assembly grids, compression springs, upper tube holders and lower nozzle holders. The fuel cladding houses the nuclear fuel rods, isolates the fuel from the coolant, and contains fission gases. It is the first barrier to prevent the escape of radioactive particles. During normal operation, due to thermal expansion, densification, swelling, cracks and released fission gas of nuclear fuel rods, the fuel cladding may be deformed and ruptured, resulting in an increase in the radioactivity of the primary circuit coolant. Therefore, it is necessary to carry out necessary inspections on nuclear fuel assemblies. When the nuclear fuel assembly is damaged, replace the nuclear fuel assembly in time. [0003] Si...

AI Technical Summary

Problems solved by technology

[0004] However, in the above-mentioned fuel detection video detection method, the determination of the degree of deformation of the nuclear fuel assembly requires the operator to judge with human eyes based on actual experience. Often due to the lack of experience of the operator or misjudgment due to the limitations of the human eye, the detection accuracy is poor.

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