Application of reliability analysis about nuclear power plant system

For nuclear power plant operation reliability is the base of usability, economy and safety. And it is the primary impact factor to optimize life cycle cost of nuclear power plant. How to promote the reliability of nuclear power plant and facilities availably is the emphases and difficulty to design nuclear power plant all the while. Based on the different characteristic of each design phase, corresponding analysis and evaluation means of reliability for each phase are presented. A suit of technology of engineering practices associated with operating characteristic is set up to direct reliability design of nuclear power plant. (authors)