[en] Nuclear power plant containing nuclear reactor and steam generator (SG) is described. The main heating surface of SG is joined up at the outlet with the pipeline of live steam which is supplied to high pressure casing (HPC) of the turbine. Additional heating surface of SG is also joined up with HPC inlet. Steam heated superheater with the pipeline of heating steam drainage which is connected with the inlet of SG additional heating surface is installed between the HPC and low pressure casing. The given circuit enables to generate live steam on additional heating surface. This increases the thermal efficiency of the cycle and intermediate steam overheat. For 4300 MWt NPP with fast helium reactor this investintion enables to increase electric efficiency by 0.44% and power - by 18.75 MWe