Nuclear power plant reactor pressure vessel flange contact belt ultrasonic scanning device

Abstract

The invention relates to an ultrasonic scanning device for a nuclear power station reactor pressure vessel flange connection band. The ultrasonic scanning device comprises a main body which can rotate around a main body axis as a rotation axis along a circumferential direction and move up and down along the axis, a checking arm which can stretch out and draw back along a rotation axis direction perpendicular to the main body, and a probe assembly. The end of the probe assembly is provided with a universal wheel assembly which is used for ensuring a constant distance between water immersion ultrasonic probes and the surface of a flange connection band in the container. The probe assembly is provided with the universal wheel assembly so that the probe assembly has a distance adaptive function, the constant distance between the water immersion ultrasonic probes and the surface of the flange connection band is guaranteed, a strict distance parameter in water immersion ultrasonic probe scanning is guaranteed and the influence produced by various types of central deviation on the ultrasonic signals is avoided.

Description

technical field [0001] The invention relates to an ultrasonic scanning device, in particular to an ultrasonic scanning device for a flange connection belt of a reactor pressure vessel of a nuclear power plant. Background technique [0002] The nuclear reactor pressure vessel is one of the most important components of a nuclear power plant. It is used to fix, support and contain the core and all reactor internals. It is the only large-scale component that cannot be replaced during the entire life of the nuclear power plant. The quality of the nuclear reactor pressure vessel is the key to ensure the normal and safe operation of the nuclear power system. [0003] In order to determine the quality of nuclear reactor pressure vessels, the inspection specifications and programs of nuclear power plants and nuclear power plants put forward mandatory requirements for non-destructive testing of welds and other parts of pressure vessels, and specify that they should be inspected before...

AI Technical Summary

Problems solved by technology

Existing scan device has the patent US4169758 of the BW company BW of the U.S., as Figure 7 As shown, the straight probe 20C, angled probes 20B and 20A are installed on the probe mounting block 204, and they can only check the angle and position of the probe mounting block 204 in the directions of F, G, V, and W before scanning. Adjustment, which does not have an adaptive function during the scanning process, so it does not have the ability to overcome this center deviation

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