Complex Analysis of NPP Safety Systems with VVER in Emergency Situations Using the Example of the Novovoronezh NPP-2 Project

The article proposes a combined system of emergency cooling of a two-unit nuclear power plant with constantly operating additional steam-turbine units and a two-channel emergency power system with diesel generators. To justify the competitiveness of the proposed combined emergency cooling system compared to the passive residual heat removal systems, we proposed a method based on the defining a multicriteria target function taking into account the influence of the safety factor, as well as technical and economic indicators on the resulting combination effect. Based on the case of the Novovoronezh NPP-2 project, the resulting economic effect from replacement of heat exchangers in the passive heat removal systems for additional low-power steam turbines was determined for two NPP power units. It is shown that the overall capital investments and operating costs are reduced under a slight increase in the risk of core damage, which does not exceed the IAEA standards.