OZONE OXIDATION OF DEPOSITS IN COOLING SYSTEMS OF NUCLEAR REACTORS

摘要

Disclosed is an improved process for oxidizing chromium in deposits in the cooling system of a nuclear reactor using a solution of ozone. The improvement consists of adding to the solution about 0.01 to about 0.5% of a water-soluble cerium IV compound, about 0.1 to about 0.5% of a water-soluable aromatic compound having at least one ketone group on an aromatic ring, or adding both. Also disclosed is the composition of water, ozone, the cerium IV compound and the aromatic compound. Also disclosed is a process for decontaminating the cooling system of nuclear reactors by adding a decontamination composition to the coolant, circulating the coolant between the cooling system and a cation exchange resin, removing the decontamination composition by passing it through an anion exchange resin, adjusting the temperature to 40 to about 100.degree.C, adding the ozone oxidation composition, circulating the coolant through the cooling system, raising the temperature to at least about 100.degree.C, passing the coolant through an anion exchange resin or a mixed resin, adjusting the temperature to about 60 to 100.degree.C and repeating the addition of the decontamination composition and its removal.