Abstract: The method is to develop an anticorrosive cover out of oxides of structural steel components on a circuit internal surface in which in the course of the circuit operation, the oxygen concentration, which is dissolved in the coolant, is maintained not lower than the value, which has been determined from the expressionIgC=-0.33-2790/T+IgC.sub.S +IgJC.sub.Pb,whereC is the concentration of oxygen, dissolved in the coolant, mass %;T is the coolant maximum temperature in the circuit, .degree. K.;C.sub.S is the saturated concentration of oxygen dissolved in the coolant at the temperature T, mass %;J is the thermodynamic activity coefficient of lead in the coolant, inverse mass %; andC.sub.Pb is the lead concentration in the coolant, mass %.