Optimization of the decontamination of primary circuits of nuclear power installations

Two conflicting problems are solved in the course of chemical decontamination of the primary circuit of nuclear reactors: removing the maximal amount of radionuclides from the surfaces of the primary circuit equipment and minimizing the impact of decontaminating solutions on structural materials. A criterion for reliable determination of the completion of dissolution of surface corrosion deposits is suggested and substantiated. Since the criterion suggested is not related to the specific decontamination solutions, it can be applied to any decontamination procedure and chemical washing of the equipment in nuclear and thermal power industry.