Optimization of critical infrastructures safety

In the paper a general model of a critical infrastructure system with variable operation process is presented. The critical infrastructure system safety structure and the system components' safety parameters are changing dependently at the various operation states. The general safety model for this system and the linear programming are applied to optimize that system operation process and to obtain optimal values of its safety characteristics. The optimization problem depends on finding the optimal values of the critical infrastructure operation process transient probabilities at the particular operation states. Those transient probabilities optimal values maximize the system mean value of the unconditional system lifetime in the safety states subset not worse than a critical system safety state. Moreover, the procedure of finding the optimal values of other main critical infrastructure safety characteristics is presented and applied to an exemplary critical infrastructure.