Chemical process for primary system material passivation during hot functional testing of nuclear power plants

The invention relates to a chemical process for primary system material passivation during hot functional testing of nuclear power plants. The chemical process includes the introduction of chemical additives into coolant water that circulates through the primary system of a new nuclear power plant, at various temperatures. The chemical additives contact the primary system surfaces, which results in the formation of a protective zinc-containing oxide film on the fresh surfaces to control corrosion release and deposition during subsequent normal operation of the nuclear power plant. The method includes a series of three chemistry phases to optimize the passivation process: 1) an alkaline-reducing phase, 2) an acid-reducing phase and 3) an acid-oxidizing phase. 本发明涉及一种用于核电厂的热态功能试验期间的主系统材料钝化的化学工艺。该工艺包括在不同温度下向循环通过新的核电厂的主系统的冷却剂水引入化学添加剂。该化学添加剂与主系统的表面接触，这导致在新鲜表面上形成保护性的含锌的氧化物膜，以控制在核电厂的随后正常运行期间的腐蚀释放和沉积。该方法包括一系列的三个化学阶段以优化钝化过程：1)碱还原阶段、2)酸还原阶段和3)酸氧化阶段。