Inspection device for outer wall of reactor pressure vessel bottom head penetration

Abstract

The invention discloses a reactor pressure vessel bottom head penetration piece outer wall inspection apparatus. The apparatus comprises a self-adaptive mechanism used for arranging an eddy current probe and allowing the eddy current probe to always cling to a penetration piece and a bottom head when the eddy current probe rotates around the penetration piece, a first axial driving mechanism for driving the self-adaptive mechanism to move along the axial direction of the penetration piece, a first circumferential driving mechanism for driving the self-adaptive mechanism to move along the circumferential direction of the penetration piece, and a first positioning mechanism for realizing positioning of the outer wall inspection apparatus. The outer wall inspection device has a compact structure and a small size, can be easily and accurately sleeved on the outer wall of the penetration piece or can enter the penetration piece under the driving of an operating platform in order to carry out scanning, and does not generate too large transverse overturning force on the penetration piece due to its small volume weight if the inspection device shakes; and the self-adaptive mechanism of the outer wall inspection device can guarantee that the eddy current probe always clings to the bottom head and the penetration piece in the scanning process in order to obtain accurate inspection data.

Description

technical field [0001] The invention relates to the field of nuclear power non-destructive testing, in particular to a device for inspecting the outer wall of a penetrating part of a bottom head of a reactor pressure vessel. Background technique [0002] The nuclear reactor pressure vessel is one of the most important components of a nuclear power plant, and it is an RCC-M nuclear safety first-level equipment. The quality of the nuclear reactor pressure vessel is the key to ensure the safe operation of the nuclear power system, and it is the only large-scale non-replaceable component in the entire life of the nuclear power plant. In order to determine the quality of nuclear reactor pressure vessels, the inspection specifications and outlines of nuclear power plants and nuclear power plants put forward mandatory requirements for non-destructive testing of the welds and other parts of the reactor pressure vessels, and specify that they should be inspected before they are put i...

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Problems solved by technology

[0005] The inspection technology research reported in the paper (1000MW PWR reactor pressure vessel CRDM and BMI penetration piece J-shaped weld ultrasonic inspection technology research, 2010 China Nuclear Power Industry Science and Technology Innovation and Development Forum Proceedings) mainly focuses on the BMI structure in the manufacturing plant environment The inspection does not involve the radiation environment of the nuclear power plant site, nor can it realize the installation and operation environment at a depth of 19 meters underwater

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