THE USE OF WWER-1000 LIVING PROBABILISTIC SAFETY ASSESSMENT IN SUPPORT OF THE DESIGN AND OPERATIONAL DECISION MAKING PROCESS

摘要

The nuclear power industry is continually striving to improve plant reliability, availability and safety at an acceptable cost without compromising safety standards. Reliability is manifested by the extent to which operations are continuous and trouble free; availability is evidenced by a low level of unscheduled downtime; and safety of operation can be demonstrated by a high availability of safety systems and well trained operators. Improvements in design, operating procedures, technical specification for operation, and the performance of maintenance are some of the ways in which improved reliability and safety can be achieved. The use of a real time model for predicting risk, based on the current configuration and testing status of the plant, is a way of ordering test and maintenance activities to minimize risk. At the same time the performance of maintenance activities may increase the risk during the operational phase. However, risk is also posed by the performance of maintenance activities in certain configurations when the plant is shut down.