Research On Auxiliary Power System Design Scheme Of Nuclear Power Plant

After the Fukushima nuclear accident,the problems of nuclear safety and development were paid attention and reflected. This accident had made a great impact on nuclear power development policy in china. The guideline of “active development” was replaced with “safety first”. Research and adoption of prevention and recovery measures from the electrical design point of view and improvement of the nuclear power global safety level had real significance for the chinese nuclear power improvement safely and efficiently.In this paper, the basic design requirement and the configuration principle of the auxiliary power system were elaborated with the research on M310, WWER1000 and AP1000 nuclear power plants building or built in china. The load categorization method was compared and the principle was summarized to various types of nuclear power plants. According to the requirement of power supply, the auxiliary power system was composed of normal auxiliary power system and emergent auxiliary power system in this paper. The connection mode of the power supply source, system connection, the principle of busbar subsection, voltage selection and the switch mode of auxiliary power system were analyzed and studied on normal auxiliary power system. The composition and configuration of emergent auxiliary power system were discussed. On the basis of the summarization for auxiliary power system design schemes in nuclear power plants building or built in china, the development direction and advice were proposed to provide technical support.M310, WWER1000 and AP1000 nuclear power plants design refered to foreign standard. The influence of the multilateral technique led to unconsistent standard and technical route. The auxiliary power system design schemes were different. Compilation of technical code for the design of auxiliary power system in nuclear power plants based on the conditions of China is a necessary work. Only nuclear power standard system is matched to the industrial system in China, independent nuclear power design will be realized. The research on auxiliary power system design scheme of nuclear power plant in this paper expects to provide reference and experience for the establishment of nuclear power standard system in china.