Nondestructive detection device for high-energy X-ray of nuclear fuel assembly

Abstract

The invention relates to a nondestructive detection device for the high energy X-ray of a nuclear fuel assembly. The nondestructive detection device comprises an accelerator system, a detection acquisition system, an image processing reconfiguration system and a remote control system, wherein the accelerator system comprises a ray machine head and a front collimator unit; the detection acquisition system comprises an acquisition output unit and an acquisition system shielding mechanism; the image processing reconfiguration system processes received image information through a watershed algorithm in combination with a level set algorithm; the remote control system controls the accelerator system, the detection acquisition system and image processing reconfiguration system, and sets pulse time sequences to different X-rays by the accelerator system through a Monte Carlo method, and sets the output time sequence of the detection acquisition system. The nondestructive detection device can perform X-ray detection on the nuclear fuel assembly in the environment of high radioactivity, so as to obtain high spatial resolution three-dimensional images.

Description

Technical field [0001] The invention relates to a non-destructive testing device, in particular to a high-energy X-ray non-destructive testing device applied to nuclear fuel assemblies. Background technique [0002] In the prior art, X-ray transmission detection of the internal structure of an object and acquisition of scan images have been widely used. However, under normal circumstances, the detection object itself does not have any radiation. For high-energy X-ray detection of nuclear fuel assemblies, the detection object itself emits strong radiation. It is difficult to obtain good detection results using ordinary X-ray technology, and it is even difficult for the detection system to operate properly. [0003] The reasons are as follows: (1) The core component of the reactor in a nuclear facility is a nuclear fuel assembly, which has high radioactivity and a detection system for high-radioactivity fuel assemblies. The high radioactivity of nuclear fuel assemblies first requires...

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Problems solved by technology

However, in general, the detection object itself does not have any radiation. For high-energy X-ray detection of nuclear fuel assemblies, the detection object itself emits strong radiation. It is difficult to obtain good detection results with ordinary X-ray technology, and even the detection system is difficult to operate properly.

[0003] The reasons are as follows: (1) The core component of the reactor in a nuclear facility is the nuclear fuel assembly, which itself has high radioactivity, and the detection system for the high radioactivity fuel assembly. The high radioactivity of the nuclear fuel assembly first requires that the detection device be placed in a shielded room that meets the requirements. Every part or equipment in the system must be designed for radiation shielding, otherwise the equipment or components will be damaged and cannot work normally, so ordinary X-ray devices cannot be used to detect nuclear fuel components.

(2) The high radioactivity of irradiated nuclear fuel assemblies will bring great interference to the detection environment, that is to say, the noise interference background is very large. If ordinary detection methods are used, images with high spatial resolution will not be obtained, or even Get 3D imaging of nuclear fuel assemblies

[0005] The above-mentioned patents use photon detectors to detect radioactive liquids, but the container walls of the radioactive liquids are incomparably radioactive compared with nuclear fuel assemblies. In addition to producing gamma rays, nuclear fuel assemblies also produce some neutrons, which will cause some interference. background, and there are two reasons above, the above three-dimensional imaging cannot be obtained

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