Patent ID: 8259894

Claim:
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; and forming a ferrite film on the surface of the structural member contacted by the processing liquid.