ČEZ, a.s. is a long-term partner for operational reliability monitoring. The Reliability and Risk Department monitors and evaluates the reliability of elements of the Control and Management System of the Dukovany and Temelín nuclear power plants. The output is technical reports used to demonstrate compliance with selected reliability parameters to state administration authorities, in particular the State Office for Nuclear Safety. The achieved results are also a basis for the customer in determining the required number of spare parts, equipment renewal, controlled ageing process, etc.