METHOD FOR ADHERING NOBLE METAL TO CARBON STEEL MEMBER IN NUCLEAR POWER PLANT AND METHOD FOR SUPPRESSING ADHESION OF RADIONUCLIDE TO CARBON STEEL MEMBER IN NUCLEAR POWER PLANT

摘要

PROBLEM TO BE SOLVED: To provide a method for suppressing adhering of radionuclides to a carbon steel member in a nuclear power plant enabling effect of suppressing adhesion of radionuclides to a carbon steel member to be maintained for a longer period.SOLUTION: A method for adhering noble metal to a carbon steel member in a nuclear power plant is provided, comprising: connecting a film formation device to clarification system piping made of carbon steel, of a BWR (Boiling Water Reactor) plant (S1); injecting a nickel formate aqueous solution and hydrazine into circulation piping of the film formation device (S4 and S5); guiding an aqueous solution including nickel formate and hydrazine to the chemically decontaminated clarification system piping to form a nickel metal film on the inner surface of the piping; injecting a platinum ion aqueous solution and hydrazine into the circulation piping (S9 and S10); supplying an aqueous solution including platinum ions and hydrazine to the clarification system piping to adhere platinum to a surface of the nickel metal film; and detaching the film formation device from the clarification system piping before starting the BWR plant. Reactor water of 200°C or higher is guided into the clarification system piping, and then the nickel metal film is converted into a stable nickel ferrite film not eluted even by platinum adhering thereto.SELECTED DRAWING: Figure 12