Probe frame of supersonic inspection device for weld joint at safe end of nuclear reactor pressure vessel

Abstract

The invention relates to a probe frame of a supersonic inspection device for a weld joint at a safe end of a nuclear reactor pressure vessel. Multiple groups of probe frames are distributed on a rotating disc along a circumferential direction, and the centers of all the probe frames are in the same plane. Each probe frame comprises a supersonic probe, a retainer connected with the supersonic probe, and two stages of linear motion mechanism connected with the retainer and used for driving the retainer to stretch or retract radially along the rotating disc; the first stage of linear motion mechanism is used for controlling the position of the probe frame relative to the rotating disc; the second stage of linear motion mechanism is used for controlling the position of the prove frame relative to a movable seat plate; under the restriction of the two stages of linear motion mechanism, the supersonic probe can effectively prevent scratching the inner wall of a pipe nozzle when in a retraction state and can ensure perfect coupling with the inner wall of the pipe nozzle for ensuring accurate and reliable scanning results when in a stretching sate.

Description

technical field [0001] The invention relates to the field of detection equipment for in-service / pre-service inspection of reactor pressure vessels of nuclear power plants, and in particular to ultrasonic inspection equipment and an ultrasonic probe frame for pressure vessel water outlets and water inlet nozzles. 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. Figure 8 The shown nuclear reactor pressure vessel has a main body of a cylinder 101, the upper part of the cylinder 101 is connected with a hemispherical upper head (not shown in the figure) and a flange 102 through a bolt a...

AI Technical Summary

Problems solved by technology

Most of the existing probe racks are driven by a single linear line, which cannot be completely retracted in the rotating disk, and cannot ensure effective contact and coupling with the inner wall after stretching, and are prone to missing scans, so the reliability and accuracy of the detection results cannot be guaranteed. ; or the structure of the existing probe frame is relatively large so that the arrangement of the ultrasonic probe in the nozzle is limited, resulting in a certain distance of invalid scanning movement during the scanning process, thereby increasing the time for ultrasonic inspection of the weld seam at the safety end of the pressure vessel

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