[en] This presentation describes: the analysis of operating events; nuclear safety concepts (the development of conceptual problems and the presentation of NPP as a future energy); probabilistic safety assessment (reliability analyses of systems and equipment, and PSA at level 1 and 2); thermo-hydraulic computer analysis (transient processes and accident situations in primary and secondary systems); reconstruction of control system for refueling machine in NPP and upgrading of the vital power supply system at V1 Bohunice NPP; measurements of neutronic and thermo - physical parameters