A three-dimensional neutron photographic nondestructive testing method for pressurized water reactor spent fuel elements

Abstract

The invention relates to a nuclear material detection method. In order to solve the problem that in the nondestructive testing field of spent fuel components of pressurized water reactors, no mature three-dimensional neutron radiographic methods are available, the invention provides a nondestructive testing method for a spent fuel component of a pressurized water reactor by virtue of three-dimensional neutron radiography. The method comprises the following steps: I, putting a neutron conversion screen; II, introducing a neutron beam for two-dimensional imaging; III, rotating the spent fuel component at a certain angle; IV, continuously repeating the steps II and III till the spent fuel component is rotated to 180 degrees so as to obtain multiple two-dimensional images; V, selecting a data correcting reference region; VI, acquiring testing information of the two-dimensional images through a digital imaging plate; VII, correcting two-dimensional testing information; VIII, deducting dark fields and light fields for three-dimensional reconstruction; and VIIII, finishing nondestructive testing. The testing method provided by the invention can be used for acquiring clear three-dimensional images of the spent fuel component of the pressurized water reactor, thereby providing a powerful guarantee for quality detection and performance enhancement of the spent fuel component of the pressurized water reactor in China.

Description

technical field [0001] The invention relates to a nuclear material detection method, in particular to a three-dimensional neutron photography non-destructive detection method 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 radiograph...

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Problems solved by technology

[0006] In order to solve the problem that there is no mature three-dimensional neutron photography method available in the field of nondestructive testing of spent fuel components in pressurized water reactors, the present invention provides a three-dimensional neutron photography nondestructive testing method for spent fuel components in pressurized water reactors

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