Thickness compensation method and compensation block for fuel rod end plug welding line X ray transillumination process

A technology of thickness compensation and fuel rods, applied in nuclear engineering, material analysis using radiation, nuclear reactor monitoring, etc., can solve the problems of insufficient detection sensitivity and large thickness of X-ray transillumination, so as to improve detection sensitivity and reduce transillumination Thickness, the effect of avoiding the interference of scattered rays

Inactive Publication Date: 2012-01-18
CHINA NUCLEAR POWER ENG CO LTD
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Problems solved by technology

However, the X-ray transillumination thickness of the full compensation method is too large, and the detection sensitivity is not high enough, so the technical solution needs to be further improved

Method used

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  • Thickness compensation method and compensation block for fuel rod end plug welding line X ray transillumination process
  • Thickness compensation method and compensation block for fuel rod end plug welding line X ray transillumination process
  • Thickness compensation method and compensation block for fuel rod end plug welding line X ray transillumination process

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Embodiment Construction

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0022] X-ray real-time imaging non-destructive testing method is usually used for nuclear fuel rod end plug welds. X-ray real-time imaging is to transmit the X-ray generated by a high-power X-ray machine to the weld of the end plug of the nuclear fuel rod, and use a digital flat panel detector to receive the X-ray transmitted through the end plug weld in real time and convert it into a digital image. The signal is transmitted to a special data processing microcomputer, which processes the data through special detection software, and displays the X-ray transillumination image of the nuclear fuel rod end plug weld on the computer screen in real time, and various defects in the weld will be displayed on the image in real time It shows that the microcomputer automatic processing system uses data processing software to analyze the defect situation through ...

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Abstract

The invention relates to a thickness compensation method and compensation block for a fuel rod end plug welding line X ray transillumination process. In the method, a compensation block which is same with materials of a fuel rod jacket and an end plug is adopted, an annular welding line of a fuel rod is placed into the compensation block, thickness compensation is carried out on partial arc section of the annular welding line of the fuel rod, the arc section of the welding line placed into the compensation block is more than 1/3 of the whole annular welding line and is not more than the circumference of the whole annular welding line, an X ray beam transilluminates vertical to the axial direction of the fuel rod, the X ray penetrates through the annular welding line of the fuel rod arranged in the compensation block, an image is formed on an X ray digital imaging plate, and the X ray transilluminates the annular welding line of the fuel rod n times, wherein n is more than or equal to 3 and less than or equal to 6, and the fuel rod rotates for 360 degrees/n every two adjacent transillumination processes. By applying the thickness compensation method provided by the invention, interference of scattered rays in direct transillumination can be avoided, and the transillumination thickness in a full-compensation method can be reduced, thus being beneficial to further improvement of the detection sensitivity.

Description

technical field [0001] The invention relates to an X-ray imaging detection technology of a fuel rod end plug weld, in particular to a thickness compensation method and a compensation block for an X-ray transillumination process of a fuel rod end plug weld. Background technique [0002] The nuclear fuel rod is the unit body of the reactor that releases heat, and is the core component of the reactor. Nuclear fuel element rods are in a strong neutron field in the reactor, and are subjected to high temperature, high pressure, and high flow rate coolant, and at the same time bear the chemical action of fissile substances and complex mechanical loads, steam corrosion, and very harsh working conditions, requiring fuel elements to have a high reliability and safety. The cladding of fuel element rods is the first barrier of the nuclear reactor, and the weld between the cladding and the end plug is the weakest link in this barrier, and it is the place where fission product leakage is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C17/06G21C17/07G01N23/04
CPCY02E30/30
Inventor 刘明张雷袁平
Owner CHINA NUCLEAR POWER ENG CO LTD
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