On-line detection device and method for external dimension of fuel pellet

Abstract

The invention provides an on-line detection device and method for external dimension of a fuel pellet. The on-line detection device comprises a fuel pellet rotary unit, a fuel pellet circumferential surface photographing unit, a fuel pellet transferring unit, a fuel pellet end surface photographing unit and an image processing unit, wherein the fuel pellet rotary unit is used for driving the fuelpellet located at a first preset position to rotate at a constant speed around the axis line; the fuel pellet circumferential surface photographing unit is used for continuously photographing the circumferential surface of the fuel pellet in the fuel pellet rotation process to obtain a complete image of the circumferential surface; the fuel pellet transferring unit is used for automatically transferring the fuel pellet from the first preset position to a second preset position; the fuel pellet end surface photographing unit is used for photographing the end surface of the fuel pellet located at the second preset position to obtain a complete image of the end surface; and the image processing unit is used for separately processing the complete image of circumferential surface and the complete image of the end surface to obtain and output the length, outer diameter, center pore diameter and chamfer size of the fuel pellet. According to the on-line detection device and method for the external dimension of the fuel pellet, detection of the outer diameter, the length, the center pore diameter and the chamfer size of the MOX nuclear fuel pellet can be automatically, efficiently and highly accurately completed, and the compatibility is good.

Description

technical field [0001] The invention relates to the technical field of nuclear fuel element detection, in particular to an online detection device for the appearance size of fuel pellets and an online detection method for the appearance size of fuel pellets. Background technique [0002] MOX nuclear fuel pellets are based on UO 2 Powder and PuO 2 Powder is used as a raw material, and ceramic bodies made by mechanical mixing, pressing and sintering are widely used in pressurized water reactors and fast reactors as nuclear fuels. [0003] During and after the production of MOX nuclear fuel pellets, due to sintering, transfer and other reasons, the length, outer diameter, central hole diameter, chamfering and other dimensions of the pellets tend to exceed the product specifications, and at the same time, defects such as pellet breakage are also caused. Will cause changes in the size of the pellets. The appearance size of MOX nuclear fuel pellets exceeds the standard. On the ...

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Problems solved by technology

[0004] Due to the strong radioactivity of MOX nuclear fuel pellets and the extreme toxicity of Pu elements, the entire online detection device must be installed in a glove box without manual intervention, which is a great test for the compatibility of the online detection device

Moreover, the existing MOX nuclear fuel pellet appearance size detection scheme can only realize the detection of the outer diameter of the MOX nuclear fuel pellet, but cannot detect the length, central aperture and chamfer size of the pellet, and the detection efficiency is low, which cannot meet the Demand for MOX Nuclear Fuel Pellet Industrial Production Line

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