Based on the thinking of energy stair utilization

a “super-structure” of flow process for a nuclear combined cycle system integrating high-temperature air co oled reactor with pressurized-water reactor nuclear power plant has been designed and constructed

establishing model according to the destination of optimization

obtaining two schemes of flow processes which can be selected and used for the said nuclear combined cycle system. Through model analysis combined with practical examples

their thermodynamic properties have been brought to light

hence the way

scheme

as well as the design and analysis method for repowering the combined cycle of the said nuclear power plant have been put forward.