| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method of suppressing sticking of radioactive nuclides on a plant constitution member that can further reduce the radioactive nuclides sticking on an atomic power plant constitution member. <P>SOLUTION: Both ends of a circulation pipe of a coating formation apparatus are connected to a recirculation system pipe of a BWR plant (S1). Chemical decontamination of the interior of the recirculation system pipe is performed (S2). Water (or a coating forming solution) flowing in the circulation pipe is heated to a temperature of 60-100°C (S3). Chemicals containing cobalt ions and formic acid are injected into the circulation pipe (S4). A chemical solution containing ferric ion ions and formic acid is injected into the solution containing the cobalt ions and formic acid (S5). Hydrogen peroxide is injected into a solution containing chromium ions, ferric iron ions, etc. (S6) Hydrazine is injected into the solution containing the chromium ions, ferric iron ions, and hydrogen peroxide (S7). Then the solution is guided into the recirculation system pipe to form a ferrite coating containing non-radioactive cobalt on an inner surface of the recirculation system pipe. <P>COPYRIGHT: (C)2013,JPO&INPIT |
