| 摘要 |
<p>A method of treating a high-level radioactive waste liquid comprises a freezing and drying step wherein condensate, a nitric acid solution, and bulk wastes mainly containing sodium nitrate, sodium hydroxide and the like are separated from a high-level radioactive waste liquid, and most fission products, actinoids, and corrosion products occurring in a reprocessing process, including iron, chromium, nickel, etc., are separated as a residue containing nitrate, oxides, and the like in a safe form. A sodium hydroxide solution or the like is added to that residue to dissolve the salts of sodium nitrate, sodium hydroxide, and the like, and the residue that is not dissolved in the solution, including fission products and the corrosion products occurring in the reprocessing process, is separated. Thus, the recovery of useful elements contained in the undissolved residue is facilitated. As compared with a conventional case where the high-level radioactive waste liquid is glassified as it is, it is possible to substantially reduce the amount of substances glassified, and it is possible to enhance safety without causing corrosion of the material of equipment, an explosion, a fire, or the like.</p> |
