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Development of reliability data analysis system in nuclear power plant   MA Yingfei, and ZHANG Zhijian1   1. College of Nuclear Science and Technology, Harbin Engineering University, Nantong Street-145, Harbin, 150001, China (mayingfei2008@126.com) Abstract: The conductance of probabilistic safety assessment (PSA) and reliability centered maintenance require a huge amount of data collection, analysis and application work, where quality of safety assessment would depend not only on the programming of data algorithm but also on the screening of the collected data. An online treatment and storage system of reliability data has been developed in this study for the acquisition, calculation and accumulation of reliability data that can be used in various applications of plant engineering as well as for the probabilistic safety assessment in nuclear power plant (NPP). The system gathers the specific data of NPP such as operation data, maintenance history and shift diary of the operator from the Digital Instrument & Control System to achieve its online function. The collected data are stored in a special database after the process of examining and classifying. The reliability calculation is based on Bayes inference method which combines with a priori information and a posteriori information so that the reliability data is calculated and updated in time to make it more accurate and reliable than before. The system consisting of a huge database, a data collection module and a reliability data model can be established based on system engineering and management method, and for the application of this system, reliability data of the NPP can be transferred to Living PSA model to compute the instant and average risk. The long-term storage of the reliability data also becomes the foundation of reliability-centered activity so that it makes possible for users to comprehend the present state and to predict the trend of the reliability information related to the equipment and component in the NPP. The proposed system will contribute to reinforce the wide use of PSA to provide an integrated system that offers all the information needed for the PSA from the basic plant data to the customized reliability data. Keyword: probabilistic safety assessment (PSA); reliability centered maintenance; online treatment and storage of reliability data
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