| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method of reducing doses in nuclear power plant constituting members that can further restrain a radioactive nuclide from being taken in a ferrite film.SOLUTION: During a period in which a nuclear power plant does not operate, a film formation device is connected to recycle system piping on which a film is to be formed, and a film formation solution having a pH within a range from 5.5 to 9.0 that contains an iron(II) ion, a hydrogen peroxide, and a hydrazine is supplied from the film formation device to a recycle system piping. A ferrite film is thereby formed on the inner face of the recycle system piping. The film formation device is detached from the recycle system piping and a nuclear reactor is started. When the temperature of reactor water reaches a rated temperature in a heating and pressurizing process, the nuclear reactor is caused to continue operating for 500 hours without injecting a hydrogen. At this point, reactor water having a corrosion potential within a range from -0.2 V to 0.2 V is brought into contact with the surface of the ferrite film to form a hematite film on the surface of the ferrite film.</p> |
