Patent ID: 8494107

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 including a hermetically sealable container and locating the chemical liquid conditioning device in a non-radiation controlled area; placing an acidic aqueous solution in the container that is provided with a gas introduction port, a discharge port and a take-out port, the container further having a valve at each of the ports; removing dissolved oxygen from the aqueous solution by circulating an inert gas through a gaseous phase section of the container and heating the aqueous solution while preventing the aqueous solution from contacting oxygen; after the removal of the dissolved oxygen, preparing the first chemical by adding metal iron to the aqueous solution and dissolving the metal iron; ascertaining that the metal iron has been dissolved in the organic acid aqueous solution in the container; cooling the organic acid aqueous solution containing the dissolved metal iron; closing the valves at the gas introduction port and discharge port such that the container is hermetically sealed at a pressure higher than atmospheric pressure using the inert gas that is circulated, and storing the container while maintaining the hermetically sealed state of the container; transporting the container that contains the first chemical with ferrous (II) ions under the hermetically sealed state 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 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; connecting the take-out port to a pipeline which leads to the structural member of the nuclear power plant with which surface the water coolant of the nuclear power plant comes into contact on which a ferrite film is to be formed so as to use the processing liquid that contains the first, second, and third chemicals in a mixed form; and forming a ferrite film on the surface of the structural member contacted by the processing liquid.