Nuclear rector pressure vessel nozzle safe end welding joint automatic ray inspection device

Abstract

The invention discloses a nuclear rector pressure vessel nozzle safe end welding joint automatic ray inspection device. The device comprises a support positioning mechanism for supporting the integral device on a pressure vessel, a min rotating mechanism for adjusting an inspection angle, and three telescopic inspection arm mechanisms which are peripherally and uniformly distributed to inspect the weld joint. The structure and operation inspection device provided by the invention have high automatic degree so that the staff is free from operating near source, thereby furthest eliminating the potential radiation risk; the device can simultaneously inspect safe ends of three water inlet nozzles or three water outlet nozzles in 120 degrees with each other, improve the inspection efficiency, and shorten piling time of a nuclear power station in major overhaul period; an inspection assembly has the functions of radial self-adjusting, automatic centering and through flow, is used for solving the problem that the axial direction force on the device is overlarge due to the overlarge radial force on an air bag and the pressure difference between two sides of the air bag. The technical scheme can be widely applied to the ray inspection of other underground pipelines and has great application value.

Description

technical field [0001] The invention relates to detection equipment for in-service / pre-service inspection of reactor pressure vessels of nuclear power plants, in particular to automatic ray inspection equipment for weld seams at the safety ends of nozzles of water outlets and water inlets of pressure vessels. 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. attached figure 1 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...

AI Technical Summary

Problems solved by technology

The advantage of this kind of equipment is that it is small in size and light in weight, and it is more convenient to enter and exit the nuclear island; however, it needs the assistance of on-site operators during the installation of the nozzle, and only one nozzle can be X-rayed at a time, and the inspection efficiency is low , Occupy the pile for a long time, and there is a risk of personnel radiation

Images