Inspection system and method for reactor pressure vessel bottom head penetrations

Abstract

The invention discloses a reactor pressure vessel bottom head penetration piece inspection system. The system comprises a mechanical scanning portion, an ultrasound / eddy current / video nondestructive detection portion, an electrical control portion, and an ultrasonic probe / eddy current probe / camera, and the mechanical scanning portion comprises an outer wall inspection device and an inner wall inspection device. A pressure vessel bottom head penetration piece inspection method comprises the following steps: 1, inspecting outer walls of all penetration pieces by using the outer wall inspection device; and 2, inspecting the inner walls of the all the penetration pieces by using the inner wall inspection device. The outer wall inspection device and the inner wall inspection device respectively have compact structure and small size, can be easily and accurately sleeved on the outer walls of the penetration pieces or can enter the penetration pieces under the driving of an operating platform in order to carry out scanning, and do not generate too large transverse overturning force on the penetration pieces due to small volume weights even if the inspection devices shake; 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 pieces 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 an inspection system and a detection method for a penetrating part of the 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 a...

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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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