METHOD FOR FORMING FERRITE FILM ON SURFACE OF PLANT COMPONENT, AND FERRITE FILM-FORMING APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a method for forming a ferrite film on the surface of a plant component by which the time required for the completion of ferrite film-forming work can be reduced.

SOLUTION: A film-forming apparatus is connected to recirculation system piping of a BWR plant which is a plant component (S1). An aqueous film-forming solution containing a pH adjuster, a chemical containing iron (II) ions, and an oxidizing agent is supplied to the recirculation system piping from the film-forming apparatus (S4-S6). A ferrite film is formed on the inner surface of the recirculation system piping in contact with the aqueous film-forming solution. The amount of the ferrite film formed is measured by a quartz resonator electrode device arranged in film-forming solution piping of the film-forming apparatus for supplying the aqueous film-forming solution (S7). A film-forming rate is determined based on the amount of ferrite film measured, and the amount of each chemical to be injected is controlled based on the film-forming rate (S10). It is determined whether the thickness of the ferrite film obtained based on the amount of the ferrite film measured is equal to a set thickness (S8). When the thickness of the film is equal to the set thickness, the ferrite film-forming work is completed.

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