Patent ID: 8457270

Claim:
A method of suppressing deposition of radionuclides on components of a nuclear power plant, comprising the steps of: removing contaminants including an oxide film deposited on an inner surface of piping in the nuclear power plant by chemical decontamination; supplying a processing solution into the piping through a pipe having a pump for pressurizing the processing solution and a heating apparatus for heating the processing solution after removing the contaminants, wherein the processing solution: includes a first chemical including iron (II) ions and formic acid, a second chemical for oxidizing the iron (II) ions to iron (III) ions, and a third chemical for adjusting the pH of the processing solution, and is adjusted to a temperature within 60° C. to 100° C. by the heating apparatus, injecting the first chemical, the second chemical, and the third chemical substantially in this order into the pipe, and forming a ferrite film on the inner surface of the piping by using the processing solution, wherein the steps of removing contaminants, supplying the processing solution, injecting the first chemical, the second chemical, and the third chemical, and forming the ferrite film are carried out after the nuclear power plant is stopped and before restarting the nuclear power plant.