| 摘要 |
<p>Volatile, radioactive substances, obtained in the reprocessing of nuclear fuel and contained in the gas mixtures formed and in the liquid wastes are retained and separated in several stages. In the first stage the higher nitrogen oxides contained in the gas mixtures formed in the dissolution of the nuclear fuel with nitric acid and in the denitration of the uranium and plutonium nitrates are reduced to nitric oxide (NO) and iodine is absorbed. In the second stage, the gas mixture of the first stage is separated into a fraction containing the volatile, radioactive substances and nitric oxide and a fraction mainly consisting of nitrogen and xenon. Oxygen is added to the liquid, radioactive substances and enriched with volatile, radioactive substances. The enriched oxygen and the fraction of the second stage consisting of volatile, radioactive substances and nitric oxide are jointly subjected to a chemical treatment and the oxygen is reacted with the nitric oxide. The reaction product formed is recycled into the reprocessing.</p> |
