Optimization of thermal turbine parameters at NPP with BN-type reactors

The program designed for optimization of the NPP thermal parameters with fast breeder reactors is described. The program. taking into account of neutron-physical calculation data and variable part of capital expenditures into the reactor allows to optimize the sodium temperature at the core inlet. The program is differentiated in conformity with the following main subprograms: turbine thermal parameters, steam generator, intermediate heat exchanaer, fuel component, given expenditures, optimization. Three cases of optimization with regard for the vaporizer operating life are specified. Optimization taking no account of operating life change, optimization under the condition that heat transfer pipes should operate for period no less than the given one, optimization taking into account the change of the steam generator vaporizer, life time when amortization deductions corresponding to the life time are included into the given expenditures. Comparison of schemes with high temperature sodium superheating and direct steam superheatina with hot steam shows that the first scheme results in lesser given expenditures. However with the temperature decrease of the secondary circuit sodium the difference decreases. At the same time the refusal of the steam sodium superheating facilitates the plant operation conditions and enhances its operation reliability. Taking into account the enumerated factors on the modern level of sodium steam generator processina the preference is given to the steam superheating scheme