[en] The power unit with the BN-1200 reactor plant was analyzed considering requirements imposed to innovative nuclear technologies, including IAEA recommendations. The BN-1200 design considers the following types of beyond-design accidents: - heat-removal accidents with loss of power, failures of active systems of reactor shutdown, failures of normal cooldown systems and active elements of emergency cooldown; - accidents with positive reactivity introduction and failures of active reactor shutdown systems; - accidents with blockage of fuel assembly flow area. Design safety analysis for beyond-design accidents was made by verified codes, developed under the Federal Target Program. A complex approach, which analyzes main processes and phenomena taking place in the reactor plant and power unit rooms during accident, is used for safety assurance. The analysis results show that evacuation of population is not required for the expected exposure doses outside the nuclear power plant. (author)