The probabilistic safety analysis(PSA)technology,as a mature safety evaluation technology for nu-clear power plants,has been widely used in the design,operation,maintenance and technical alteration of nucle-ar power plants.The PSA work in China started in the 1980 s and has developed rapidly in recent years.In Chi-na,the regulatory body National Nuclear Safety Administration(NNSA)also encourages nuclear power plants to use the combination of PSA and deterministic approach to evaluate and optimize the safety of production,op-eration and maintenance activities of power plants.There are 9 units in operation at Qinshan site,which are technically supported by(China Nuclear Power Operation Management Co.,Ltd.(CNNO).The development of PSA by CNNO began in 2001.Since then,the PSA model of each unit has been continuously improved.All these lay a solid foundation for the application of PSA in CNNO.In addition,the PSA is introduced into the safety evaluation of power plants and corresponding management procedures are established.Thus,a set of risk-informed application systems have been formed for the use in plant maintenance,operation and other pro-duction activities.It plays an important role in ensuring the safe and stable operation of power plants and impro-ving the operation efficiency of power plants.
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