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The surface protective layer made of organic materials in water-cooled reactor systems is a crucial safeguard to ensure the long-term stable operation of the equipment under conditions of high radiation and high-temperature corrosion; it must meet specific requirements such as radiation resistance, easy cleaning, and integrity after accidents. 1. Mainstream typical formulation: A moisture-proof, heat-conductive, and radiation-resistant coating is made by using 100 parts of elastic rubber as the base material, along with 0.3 parts of platinum catalyst, 60 parts of alumina, 60 parts of magnesium oxide, and 1.2 parts of color paste; additionally, 50–60 parts of organic solvent are used. The elastic rubber is obtained by mixing silicone rubber, fumed silica, calcium carbonate, and dimethicone, and it possesses comprehensive properties related to moisture prevention, heat conduction, and heat dissipation. Corrosion-resistant composite coating: It consists of an organic zinc-rich coating and an outer epoxy resin coating. The zinc powder in the zinc-rich coating is completely enclosed by organic materials, which prevents the coating from reacting with water after absorbing moisture and releasing hydrogen gas. This reduces the formation of alkaline zinc hydroxide and avoids bubbling between the different layers of the coating, thus enabling it to maintain its protective properties over a long period of time. 2. Key application scenarios: These organic protective coatings are widely used on the inner walls of pressure suppression chambers in water-cooled reactors, as well as on the inner and outer surfaces of containment structures. They are particularly suitable for the dual-concrete and steel containment design of passive nuclear power plants, as they can significantly reduce the rate of equipment corrosion and aging, thereby cutting down the maintenance costs associated with corrosion in nuclear power plants.