BOSS head weld defect assessment method, device and apparatus for nuclear power station, and medium

Abstract

The invention relates to the technical field of nuclear power station engineering manufacturing, and discloses a BOSS head weld defect assessment method, device and apparatus for a nuclear power station, and medium. The method comprises the steps: obtaining finite element modeling data, model constraint conditions and operation collection data of a to-be-assessed BOSS head after a weld joint in the nuclear power station; determining an interception length, and selecting a BOSS head region model according to the interception length; performing temperature field analysis, thermal stress analysis and mechanical load analysis to obtain a stress result; performing fatigue crack propagation and stress corrosion crack propagation by using a stress intensity factor analysis method, and evaluating a crack evaluation result; and carrying out fracture analysis to obtain a weld defect evaluation result of the BOSS head to be evaluated, and displaying repair measures. Fracture analysis is automatically, rapidly and objectively completed through finite element modeling data according to the actual operation working condition of the nuclear power station, the weld defect evaluation result and measure are output, leakage loss is avoided, and the operation economic benefits of the nuclear power station are improved.

Description

technical field [0001] The invention relates to the field of nuclear power plant engineering manufacturing, in particular to a method, device, equipment and medium for evaluating the weld defects of BOSS heads used in nuclear power plants. Background technique [0002] At present, a large number of BOSS head weld structures are used in the piping system of nuclear power plants (the parent pipe is opened, and the BOSS pipe is directly welded at the opening), and the welding of the BOSS head weld structure is mainly adopted by argon-electric combination (manual argon arc For the BOSS head welded according to the welding process, it is necessary to conduct liquid penetration (PT) inspection on the surface to be welded, the root weld and the surface of the completed weld to test the welding process. Quality, but this kind of inspection has the situation that the internal quality of the weld cannot be detected. However, defects such as pores, cracks, and lack of fusion inside the...

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Problems solved by technology

[0002] At present, a large number of BOSS head weld structures are used in the piping system of nuclear power plants (the parent pipe is opened, and the BOSS pipe is directly welded at the opening), and the welding of the BOSS head weld structure is mainly adopted by argon-electric combination (manual argon arc For the BOSS head welded according to the welding process, it is necessary to conduct liquid penetration (PT) inspection on the surface to be welded, the root weld and the surface of the completed weld to test the welding process. Quality, but this kind of inspection has the situation that the internal quality of the weld cannot be detected. However, defects such as pores, cracks, and lack of fusion inside the weld are likely to become a source of failure in the high-temperature and high-pressure service environment of the primary circuit, resulting in BOSS head welds. Stress corrosion cracking and other problems occur, so there is no structural integrity assessment for the weld defects of the BOSS head, and it is impossible to judge its stability during the refueling cycle or the entire service life

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