Safety and reliability of a three-state system at variable

Safety and reliability of a three-state system at variable operation conditions K e y w o r d s Three-state system, operation, reliability, safety, risk, prediction. S ł o w a k l u c z o w e System trójstanowy, eksploatacja, niezawodność, bezpieczeństwo, ryzyko, predykcja. S u m m a r y There is proposed the method of reliability analysis of a three-state system at variable operations conditions. Introduced are the notions of the conditional and unconditional the threestate system reliability functions, the mean values of system lifetimes in the reliability state subsets and in the particular reliability states, the system risk function, and the moment when the system risk function exceeds its permitted level. These characteristics are determined for an exemplary three-state system operating at four operation states