Reliability of Active Parallel Systems

by Mircea Grigoriu, Lead Engr.; ACRES Consulting Services Limited, Toronto, Cananda,

Serial Information: Journal of the Energy Division, 1979, Vol. 105, Issue 2, Pg. 199-212

Document Type: Journal Paper


Two-state random processes of Borges-Castanheta and filtered Poisson types are used to model the performance of units of an active parallel system. The states of the probabilistic model of a unit correspond to situations when the unit is operable or is undergoing repairs. The system is disabled when all l or k out of l units are simultaneously inoperable. It is shown that estimates of the probability of successful performance of the system during a reference period, or the reliability, based on the filtered Poisson model are attractively simple and accurate. Results obtained are used to find the reliability of very safe two-unit active parallel systems such as the computer system controlling the reactor power in nuclear power stations.

Subject Headings: Probability | Power plants | System reliability | Filters | Model accuracy | Nuclear safety | Computer models | Nuclear reactors

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