Abstract
The paper is devoted to research of reliability aspects of complex safety-critical systems (CSs). Nowadays such CSs are used in variety of applications, including safety systems for nuclear power plants (NPPs), power grids industrial systems and others. In the paper, models of reliability for CSs are developed and studied, taking into account intermodular and bridge communications. The following problems are resolved: a set of CSs is created based on majority voting according to the “2oo3” logic and redundancy according to the “1oo2” logic considering intermodular and bridge communications; 2) reliability block diagrams (RBDs), analytical models of CS reliability with (multi)cascade redundancy of “2oo3” and “1oo2” principles are developed (including RBDs of reactor trip systems considering communications); 3) the models are studied, the dependencies for failure-free operation probabilities of various CSs, failure rates of intermodular and bridge communications and voting elements are determined; 4) recommendations for the selection of CS types are stated.
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