Common cause failures: definitions and typical errors

The Aim of the paper is to analyse definitions term “common cause failures” given in various international and Russian standards point out their shortcomings; identify typical errors use this notion consideration such failures as part system dependability calculation. importance topic due fact that reduce efficiency redundancy must be taken into account process design systems with high requirements. Methods. provides a comparative analysis definition common standards; analyses methods taking effect presented publications; uses probability theory. Results. Differences between were identified terms failure”, well shortcomings definitions. Typical pointed some publications dedicated consideration. simplest most beta-factor model was considered detail, limits its application out. Conclusions. It advisable single different standards. from basic terminological standard an appropriate reference. In itself definition, word “failures” plural. GOST EN 1070-2003 34332.3-2021 are wrong, they no way correspond content defined notion. conventional intended for failure calculation can only used case probabilities being low.