Reactor pressure vessel main pipeline nozzle internal inspection equipment

Abstract

The invention relates to reactor pressure vessel main pipeline nozzle internal inspection equipment which comprises a diving inspection mechanism, a positioning mechanism and a control module for controlling the diving inspection mechanism and the positioning mechanism to act. The diving inspection mechanism comprises a rack, an inspection module used for inspecting internal defects of a pipe nozzle, a buoyancy module used for providing buoyancy, a power module used for providing diving motion power and a searchlighting module used for searchlighting the underwater environment. The positioning mechanism comprises a position detection assembly for sensing and detecting the position of the diving inspection mechanism and a fixing assembly for fixing the position of the diving inspection mechanism; according to the internal inspection equipment for the main pipeline nozzle of the reactor pressure vessel, the overhaul period is shortened, and few nuclear island resources are occupied; and the equipment can accurately position an inspection area, the positioning precision is 0.1 mm, the inspection efficiency is high, the inspection accuracy is high, and reactor safety accidents are avoided.

Description

technical field [0001] The invention relates to a device for inspecting the inside of a nozzle of a main pipe 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. 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. 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 putting into operation and during operation. Carry out pre-service and in-ser...

AI Technical Summary

Problems solved by technology

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 putting into operation and during operation. Carry out pre-service and in-service inspections of pressure vessels after a certain time interval; at present, the inspection of the intersection area between the nozzle of the main pipe of the reactor pressure vessel and the nozzle of the pressure vessel is mainly performed by tying the camera to a long pole, and then manual operation The rod body drives the camera to inspect the inside of the nozzle. This method is not only very inconvenient to operate, but also very inefficient. Moreover, because the position of the camera cannot be precisely controlled, the inspection results are not accurate enough, which may easily lead to safety accidents in nuclear power plants.

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