Reliability analysis method for marine passive safety system

Abstract

The invention provides a reliability analysis method for a marine passive safety system, and belongs to the probability safety analysis and evaluation field of marine nuclear power units. The providedmethod comprises the following steps: (1) using complicated ocean motion as an uncertainty parameter, and combining thermotechnical hydraulic analytical calculation in the ocean condition; (2) screening system key parameters in the different running states by using a global sensitivity analysis method; (3) generating a response surface substitution model to improve the computational efficiency; and (4) integrating a physical invalid result to a PSA model, quantitatively calculating the reliability of the passive safety system under the different ocean conditions. The provided method is capable of integrating the complicated external operating environment to the probability safety analysis process, more efficiently, accurately and globally calculating the reliability of the passive safetysystem under the different ocean conditions, and expanding the application range of the passive system reliability analysis method.

Description

technical field [0001] The invention belongs to the field of probabilistic safety analysis and evaluation of marine nuclear power devices, and relates to a reliability evaluation method for a marine passive safety system. Background technique [0002] After the Fukushima accident in Japan, the new generation of reactor designs put forward higher requirements for inherent safety. The passive safety system relies on natural laws such as natural circulation and gravity as the driving force, reducing the dependence on external power supply and operator intervention; the passive safety system greatly simplifies the system layout, cancels valves, pumps and other equipment, and ensures While improving safety, it also greatly improves its economy. [0003] The passive safety system relies on the laws of physics to realize the system function, its driving force is small, and it is more sensitive to the fluctuation of the external operating environment and operating parameters. Unce...

AI Technical Summary

Problems solved by technology

However, due to the influence of ocean conditions, the operating environment of the marine passive safety system is in a complex and changeable state. The natural circulation flow and heat transfer characteristics are affected by sea conditions such as swaying and tilting, and the operating characteristics of the passive safety system are also bound to be affected. , which in turn affects the reliability of the passive system

[0006] Through the investigation of the existing literature, it is found that the current reliability analysis of passive safety systems is only for land-based nuclear power plants, without considering the impact of the external operating environment

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