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Multi-fragmental and multi-phase availability models of the safety-critical I&C systems with two-cascade redundancy

Kharchenko Vyacheslav, Ponochovnyi Yuriy, Babeshko Ievgen

International Journal of Electronics and Telecommunications

2024

Vol. 70, No. 1

211--218

Traditional availability, reliability, and safety models face the dimension problem due to a huge number of components in modern systems, motivating further research in this field. This paper focuses on multi-fragmental and multiphase models for availability and functional safety assessment of the information and control (I&C) systems with two-cascade redundancy considering design faults manifestation during operation. The methodology of the research is based on Markov and semi-Markov chains with the utilization of multi-phase modeling. Several multi-phase models are developed and investigated considering different conditions of operation and failures caused by version faults. The case study of the research is based on the analysis of safety-critical nuclear power plant I&C systems such as the reactor trip systems developed using the programmable platform RadICS.