Efficiency investigation of nuclear power plant combination with a system of water and phase-transfer heat accumulators

Combination of nuclear power plants with accumulation installations can be one of the ways to participate in regulating load schedules for the NPP, due to the fact that it allows to store of cheap night time non-peak energy and it's further using during the peak hours of electric load. The use of accumulating systems will allow to optimize the structure of power generating capacities with the possibility of increasing the share of powerful power units and also will reduce emissions into the environment by reducing the share of thermal power plants operating on fossil fuels. One of the most perspective types of batteries are phase transition accumulator. Their use will make it possible to get the steam for an additional turbine without changing the steam flow in the main NPP cycle and will allow to avoid equipment modernization and an increase in its wear. At the same time such accumulators are very expensive. One of the solutions can be a combination of phase transition accumulator and additional steam turbine with inexpensive, in relation to phase transition accumulator, feed water accumulators, which, like the phase transition accumulator, will be charged at night due the energy of main steam. In this case, the phase transition accumulator will work only as a steam generator. In the course of this work, the systemic conditions for the payback of the proposed accumulation system are determined. Net present value is determined in the depending of range of half-peak and off-peak electricity tariffs.