Utilization of Foreign Operational Experience for Deriving Reliability Parameters - Especially for Dependent Failures

[Automatically extracted and translated] The requirements for the safety technology of a nuclear power plant have led to a comprehensive concept of quality assurance measures, so that safety-relevant disturbances are very unlikely from the outset. However, if they do occur, safety systems prevent them from escalating into incidents, with design principles such as redundancy, diversity, and decoupling ensuring high system reliability. Experience with the reliability of complete systems under actual incident conditions is therefore very limited; the high safety requirements are fundamentally the reason for the lack of failure data for complete systems. To still be able to make statements about the achieved system reliability, a support method (fault tree analysis) is used, which breaks down the system into its components for which empirical values exist. The quality of the result thus depends on the quality of the system modeling and the input data.