PWR's unresolved safety issues as checked by DSN

By use of deterministic and probabilistic methods for safety analysis at the design and construction stage, several safety issues concerning French PWR plants have been identified. Some of these issues have also been identified by NRC, whereas others are specific to the French safety approach. These issues have led to implementation of specific measures at operating plants, and are being taken into account in the design of future units. Analysis of operating experience and incidents is also being used to verify and validate existing designs, and identify any deficiencies in design and procedures, particularly at the level of plant operation and man-reactor interfaces