Patent Number: 
Section: claims

1. A method of suppressing deposition of a radioactive isotope on a structural member in contact with water coolant of a nuclear power plant, the method comprising the steps of:providing a chemical liquid conditioning device and locating the chemical liquid conditioning device in a non-radiation controlled area;providing a first chemical liquid tank in the chemical liquid conditioning device;adding an organic acid aqueous solution to the first chemical liquid tank;heating the organic acid aqueous solution in the first chemical liquid tank;circulating an inert gas through a gaseous phase section of the first chemical liquid tank;adding metal iron to the organic acid aqueous solution in the first chemical liquid tank;dissolving the metal iron in the organic acid aqueous solution in the first chemical liquid tank;ascertaining that the metal iron has been dissolved in the organic acid aqueous solution in the first chemical liquid tank;cooling the organic acid aqueous solution containing the dissolved metal iron;pressurizing the first chemical liquid tank with the inert gas;providing a transport container including a second chemical liquid tank;transferring the organic acid aqueous solution from the first chemical liquid tank to the second chemical liquid tank;pressurizing the second chemical liquid tank with the inert gas;storing the organic acid aqueous solution as a first chemical in the second chemical liquid tank;transporting the second chemical liquid tank filled with the first chemical which contains ferrous (II) ions from the non-radiation-controlled area into a radiation-controlled area in which a nuclear reactor of the nuclear power plant is installed;providing a film deposition apparatus in the radiation-controlled area;connecting the second chemical liquid tank as a first chemical container filled with the first chemical to the film deposition apparatus which further includes a second chemical container containing a second chemical for oxidizing the ferrous (II) ions into ferric (III) ions, and a third chemical container containing a third chemical for pH-adjusting and forming a processing liquid containing the first chemical, the second chemical and the third chemical;bringing the processing liquid that contains the first, second, and third chemicals in a mixed form, into contact with a surface of the structural member of the nuclear power plant with which surface the water coolant of the nuclear power plant comes into contact; andforming a ferrite film on the surface of the structural member contacted by the processing liquid. 2. The method of suppressing deposition of a radioactive isotope according to claim 1, further includingproviding the structural member as an inner surface of a pipeline of a system provided in the nuclear power plant, the system having the water coolant flowing inside; andsupplying the processing liquid to an interior of the pipeline. 3. The method of suppressing deposition of a radioactive isotope according to claim 1, further including pressurizing the second chemical liquid tank to be transported into the radiation-controlled area with an inert gas in a space in the second chemical liquid tank above a liquid level of the first chemical. 4. The method of suppressing deposition of a radioactive isotope according to claim 1, further including providing a carboxylic acid in the first chemical liquid tank and using the carboxylic acid for producing the ferrous (II) ions. 5. The method of suppressing deposition of a radioactive isotope according to claim 1, further including providing the organic acid aqueous solution as an aqueous solution of carboxylic acid. 6. The method of suppressing deposition of a radioactive isotope according to claim 5, further including providing the carboxylic acid as formic acid. 7. The method of suppressing deposition of a radioactive isotope according to claim 4, further including providing the carboxylic acid as formic acid.