Reactor pressure vessel lower sealing head surfacing welding layer detection tool and method

Abstract

The invention is mainly applied to the field of nuclear power station maintenance, and particularly relates to a reactor pressure vessel lower sealing head surfacing welding layer detection tool and method. In the prior art, harmful defects are easily generated due to stress concentration in wear areas of a reactor pressure vessel so as to reduce the service life of the vessel, and defect detection needs to be performed on the wear areas. The tool comprises a linear telescopic device and a tail end monitoring device, wherein the linear telescopic device is connected with the tail end monitoring device, and the tail end monitoring device is integrally located below the linear telescopic device. The invention discloses a reactor pressure vessel lower sealing head surfacing welding layer detection method, which specifically comprises the steps of detection sensitivity setting, device connection, ultrasonic eddy current detection and ultrasonic defect quantification. According to the invention, the defect detection of the worn area of the reactor pressure vessel can be effectively realized, the working efficiency is improved, and the operation cost is reduced.

Description

technical field [0001] The invention is mainly used in the field of maintenance of nuclear power plants, and in particular relates to a detection tool and method for the surfacing layer of the lower head of a reactor pressure vessel. Background technique [0002] The reactor pressure vessel is a key component of a nuclear reactor and belongs to the nuclear primary component. During the operation of a nuclear power plant, the reactor pressure vessel is mainly loaded with the reactor core and high-temperature and high-pressure coolant, and it is required to ensure the integrity of the structure under various working conditions. During pre-service installation and commissioning of reactor pressure vessels or during in-service operation, due to improper operation or the impact of high-temperature, high-pressure, and high-turbulence water flow, other internal components will fail and cause impact wear on the inner wall of the vessel, resulting in the formation of various sizes. ...

AI Technical Summary

Problems solved by technology

Due to the extrusion and wear of the surface, deep pits are formed, resulting in the thinning or disappearance of the surfacing layer

Under the operating conditions of high temperature, high pressure and high radiation, these wear areas are prone to harmful defects due to stress concentration, reducing the service life of the container

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