Method and system for controlling gas inlet into coolant and nuclear reactor plant

FIELD: energy. SUBSTANCE: invention relates to nuclear reactor plants with liquid metal coolant. Disclosed is a method of preventing corrosion of metal structures of reactor by controlling gas inlet into coolant of nuclear reactor plant. Method comprises following steps: feeding, into volume above coolant from gas system, a gas intended for introduction into coolant; feeding gas into coolant; from volume above coolant, discharging gas into gas system. EFFECT: technical result is preventing reuse of contaminated gas. 10 cl, 4 dwg