Abstract
Safety valve is an important guarantee for nuclear power plant system. Its working environment is harsh, and medium is high-temperature corrosive. It is important to study the dynamic characteristics of nuclear safety valve under unsteady condition to improve the stability and safety of nuclear power plant piping system. Using the finite element method, mass simplification and Rayleigh method, the frequency response analysis of the safety valve and the spring is predicted to predict the seismic capacity under the earthquake load. Based on the verification of the dynamic characteristics of the valve body, the stress and strain analysis of the spring is carried out. To explore the failure condition of the safety valve spring, the lateral deviation linearity of the spring was tested and analyzed by setting up the offset test bench. The results show that the safety valve with the above analysis method can meet the working requirements under the shaking condition. The research results provide an important theoretical basis for the design and analysis of nuclear safety valves.
Highlights
It is important to study the dynamic characteristics of nuclear safety valve under unsteady condition to improve the stability and safety of nuclear power plant piping system significance
The finite element and mass simplification method is used to analyze the seismic characteristics of the safety valve
The firstorder natural frequency value of the designed safety valve is required to be greater than 33 Hz
Summary
The research object of this paper is a spring direct load type safety valve. Its working principle uses the load to be applied to the valve disc. The purpose of safety valve stress analysis is to verify its structure to meet the needs of production work. A certain load on the valve body and other key components to analysis of the valve body deformation and stress conditions[2]. In the main parts of the safety valve, the allowable stress value of the valve body is the minimum[3]. Taking the valve body as an example, the structural stress analysis process is analyzed, and the other parts and components are analyzed emphatically
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