Cooling facility in a reactor vessel and electric power generation system

A reactor coolant system provided in a reactor vessel formed to accommodate the reactor coolant system comprising;

• a main feedwater system, connected to the reactor vessel, for producing the normal power of a nuclear power plant;
• a steam generator provided in the reactor vessel;
• a main turbine formed to produce electric power by using the steam generated by the steam generator as power;
• and
• provided with an in-vessel cooling and power generation system in the reactor vessel, which is formed to produce small-scale electric power smaller than electric power generated during normal operation of the nuclear power,
• wherein the in-vessel cooling and power generation system comprises:
• a first heat exchanger provided inside the reactor vessel and formed to receive a supercritical fluid that receives heat generated from a core in the reactor vessel;
• an electric power production section including a supercritical turbine formed to receive heat from the core and produce electrical power using the energy of the supercritical fluid whose temperature is increased;
• and
• a cooler that drives the supercritical turbine and heat-exchanges the discharged supercritical fluid to contract the volume of the supercritical fluid,
• wherein,
• the first heat exchanger is provided to be separated from the main feedwater system, the steam generator and the main turbine, and wherein
• the first heat exchanger, the electric power production section, and the cooler are connected to each other by a pipe, so that the supercritical fluid is circulated through the first heat exchanger, the electric power production section, and the cooler.