scope:

NEN-EN-IEC 61078 describes: • the requirements to apply when reliability block diagrams (RBDs) are used in dependability analysis; • the procedures for modelling the dependability of a system with reliability block diagrams; • how to use RBDs for qualitative and quantitative analysis; • the procedures for using the RBD model to calculate availability, failure frequency and reliability measures for different types of systems with constant (or time dependent) probabilities of blocks success/failure, and for non-repaired blocks or repaired blocks; • some theoretical aspects and limitations in performing calculations for availability, failure frequency and reliability measures; • the relationships with fault tree analysis (see IEC 61025 [1]) and Markov techniques (see IEC 61165 [2]).