Prolongation technology of life time of ion exchange resins in nuclear power plants

From the viewpoint of the minimizing the corrosion of the reactor's structural material in the nuclear power plants, the ion exchange resins are generally used as one of purification system in order to keep water quality clean. Hydrogen peroxide generated by the radiolysis of water exists in the reactor water and it accelerates the oxidation decomposition of the ion exchange resins and finally, it becomes the cause to shorten the resin life. To solve this problem, the application of Pd doped resins which can decompose hydrogen peroxide catalytically at the surface has been considered. It was confirmed by the cold test that Pd doped resins overlaid on the ion exchange resins or mixed with the ion exchange resins decomposed hydrogen peroxide contained in the reactor water and inhibited the oxidative degradation of the ion exchange resins. We report the results of these tests. (author)