Oxidation decontamination reagent for removal of the dense radioactive oxide layer on the metal surface and oxidation decontamination method using the same

摘要

The present invention provides an oxidative decontamination reagent for removal of the dense radioactive oxide layer on a metal surface, which comprises an oxidizing agent, a metal ion, and an inorganic acid. The oxidative decontamination reagent of the present invention is characteristically prepared by adding a metal ion to the conventional oxidative decontamination reagent containing an oxidizing agent and an inorganic acid. When the oxidative decontamination reagent of the present invention is used, electric potential of the metal parts of the primary system of the nuclear power plant can be regulated as passive potential owing to the added metal ion during the oxidative decontamination of the primary metal part of the nuclear power plant. Therefore, by maintaining electric potential of the metal part as passive potential, local corrosion can be inhibited and at the same time secondary waste can be significantly reduced.

主权项

1. A method of decontamination of a primary system of a nuclear power plant system, comprising:
contacting a metal part of the primary system on which a dense radioactive oxide layer is adhered with an oxidative decontamination reagent, wherein the oxidative decontamination reagent is capable of removing the dense radioactive oxide layer on the metal part, and wherein said reagent comprises an oxidizing agent, a metal ion, and an inorganic acid, wherein the concentration of the oxidizing agent in said reagent is 1×10−5−1×10−2 M, the concentration of the inorganic acid in said reagent is 2×10−5−3×10−2 M, and wherein the concentration of the metal ion in said reagent is 2×10−5−2×10−3 M if the metal ion is Cu2+or Zn2+, and the concentration of the metal ion is 2×10−6−2×10−5 M if the metal ion is neither Cu2+nor Zn2+.