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In the neutral aqueous environment of a reactor, water radiolysis generates oxidative products such as oxygen and hydrogen peroxide, which significantly accelerates the corrosion of structural materials like carbon steel, 304LN stainless steel, Monel-400, and Incoloy-800. Corrosion inhibitors are one of the key measures for controlling this type of corrosion. I. Common types of liquid corrosion inhibitors: Hydrazine: It can maintain a certain degree of thermal stability in high-temperature water environments ranging from 200 to 285°C; it is capable of consuming the oxidizing substances generated by radiation decomposition. Electrochemical tests at 90°C show that it exhibits excellent efficiency in controlling corrosion of materials commonly used in reactors. Ammonia water (ammonium hydroxide): It can adjust the pH of the medium to a slightly alkaline level, and also acts as a reducing agent to prevent oxidative corrosion, maintaining a liquid state throughout to suit the conditions in the reactor’s primary loop. Hydroxylamine: It belongs to liquid-phase reducing corrosion inhibitors and can effectively remove oxygen and hydrogen peroxide from water, meeting the corrosion control requirements in the neutral medium of reactors. II. Core Advantages in Application: These liquid corrosion inhibitors require only 0.1% to 1% of the total volume of the medium to significantly reduce the rate of metal corrosion, without altering the original physical and mechanical properties of the reactor’s structural materials, thus meeting the stringent safety requirements of nuclear-grade equipment. III. Application precautions: It is necessary to strictly control the concentration of the corrosion inhibitor added, to prevent localized pitting caused by insufficient dosage ； At the same time, it is necessary to regularly monitor the remaining amount of corrosion inhibitors in the medium, and verify their thermal stability in conjunction with the reactor’s temperature conditions, to ensure long-term protective effects.