Abstract
Corrosion tests were conducted to select materials for the decomposition reactor using the SCWO process for organic wastes from nuclear plant. Examination conditions were determined, as Condition 1:400°C, 28.5MPa in 2%H2SO4 solution with 2%H2O2 and Condition 2:450°C, 30MPa in 1.2%H2SO4 solution with 2%H2O2, assuming the decomposition of ion exchange resin that generates sulfate ion. Firstly, in order to select candidate materials, short-period screening tests were carried out on various high corrosion resistance materials under Condition 1. Then, long-period corrosion tests were carried out for Ta, Ti and Ti alloys under Condition 2 to estimate the corrosion rate and to evaluate the applicability. The results of these tests indicate that the corrosion resistance of Ti alloys is sufficient to be applied as reactor materials for the organic waste decomposition systems using SCWO process. The structure and materials of pilot plant of SCWO for organic waste decomposition was determined from corrosion test results.
