event considering fuel fire; to cope with this event the design provides prevention of radionuclide release to environment Air impact wave at a pressure of 30 kPa and duration of the compression phase up to 1 s Wind maximum design speed up to 56 m/s Severe accidents control Modern Nuclear power plants are characterized by the unprecedented low risk of ionizing radiation propagation and radionuclide emission to environment. This result is achieved through the newest protective and localizing technologies of the safety system. The VVER-TOI project shows, as a basis variant, the configuration based on the two channel structure of active safety systems without internal backup, and four channel structure of passive safety systems. The passive safety system provides a 72 hour period requiring no operator intervention. The profile of the active safety systems is as follows: System of fuel pool emergency and planned cooling down and cooling; emergency boron injection system; steam generator emergency cooling down system; Emergency power supply system (diesel-generator set). The profile of the passive safety systems is as follows: passive part of the core emergency cooling system; passive core-flooding system; water supply system from the fuel pond to primary circuit; system of passive heat removal from steam generator; primary circuit protection against overpressure; secondary circuit protection against overpressure; fast-acting pressure reducing station; emergency gas-removal system; emergency power supply system (accumulators); passive system of inner shell leakages filtration. The accident control facility of the VVER-TOI project includes a core catcher, which provides the guaranteed safety control through melt localizing and cooling in case of a severe accident at the beyond-vessel stage of core-melt localization. Within the frame of VVER-TOI, there are performed the works directed toward optimization of technical solutions made for corium trap project to decrease cost indicators and justify the corium trap operation efficiency. It is supposed to achieve a considerable decrease in the trap vessel overall sizes and sacrificed materials weight, as well as to transfer to module design of the trap vessel that make it possible to simplify transportation of the large-sized equipment to the construction site of a Nuclear power plant. Combination of passive and active safety systems provided for in the VVER-TOI project ensures that core will not be destroyed for not less than 72 hours from the moment of severe accident happening in case of any possible scenario. The corresponding technical solutions guarantee that reactor plant will be transferred