An indirect neutron ct imaging device for spent fuel components of pressurized water reactors

Abstract

The invention relates to a nuclear material detection device. The invention provides a pressurized water reactor spent fuel element indirect neutron CT imaging device. The device realizes a 3D nondestructive test on a pressurized water reactor spent fuel element. The device comprises a spent fuel element motion control device and a conversion screen exposure device. The spent fuel element motion control device comprises a spent fuel element motion controller and a shield housing. The conversion screen exposure device comprises a neutron convert screen, a neutron convert screen channel, a neutron beam channel and a neutron convert screen motion controller. The neutron beam channel is provided with a spent fuel element inlet. The imaging device realizes a 3D nondestructive test on a pressurized water reactor spent fuel element, can acquire complete detection information of defects such as spent fuel element core fragment morphology, core inner particle distribution and a housing breaking state, and can provide forceful guarantee for quality detection and performance improvement of a pressurized water reactor spent fuel element in China.

Description

technical field [0001] The invention relates to nuclear material detection equipment, in particular to an indirect neutron CT imaging device for spent fuel components of a pressurized water reactor. Background technique [0002] In the field of nuclear industry, in order to realize the quality control of PWR nuclear fuel elements, it is necessary to detect the corresponding spent fuel elements. However, due to the strong radioactivity of PWR spent fuel elements, general detection techniques cannot be applied to its detection. [0003] As an advanced non-destructive testing technology, neutron radiography is widely used in the industrial field, and has many advantages such as fast detection speed, accurate results, and high reliability. However, the strong radioactivity of spent fuel components in PWRs will seriously interfere with neutron radiography, making it impossible to obtain detection images. Therefore, traditional neutron radiography techniques cannot be directly ap...

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Problems solved by technology

However, this method can only complete two-dimensional detection and imaging of spent fuel elements at present, so it is impossible to obtain three-dimensional information of defects such as the morphology of spent fuel element pellet fragments, the distribution of particles inside the pellet, and the state of cladding damage.

[0005] The acquisition of the 3D information of the above-mentioned defects depends on the 3D detection and imaging of spent fuel components, but because there is no mature 3D detection and imaging device available at present, the existing CT devices are completely unsuitable for the detection of spent fuel components due to various problems. Three-dimensional inspection imaging, so to realize the three-dimensional non-destructive inspection of PWR spent fuel components, it is necessary to develop a new imaging device

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