Plasma Utilization and Immobilization of Waste Reprocessing for Spent Nuclear Fuel
| Parent link: | Bulletin of the Russian Academy of Sciences: Physics=Известия Российской академии наук. Серия физическая.— .— New York: Allerton Press, Inc. Vol. 89, Suppl. 2.— 2025.— P. S332–S340 |
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| Summary: | Title screen The safe treatment and reliable immobilization of waste generated during the reprocessing of spent nuclear fuel remain critical challenges for nuclear power. This study evaluates the feasibility of a plasma-based route that converts liquid reprocessing residues into chemically stable metal-oxide powders and then immobilizes these products into durable matrices suitable for long-term storage. The approach combines thermodynamic modeling with laboratory-scale experiments. Modeling was used to determine adiabatic combustion temperatures and equilibrium phase compositions for water–salt–organic feeds under plasma exposure. Experiments with a high-frequency plasma generator confirmed that, under optimized conditions near 1200°C, organic constituents are completely oxidized, and finely dispersed oxides are formed. The resulting powders include simple and complex oxides of iron, molybdenum, zirconium, neodymium, cerium, strontium, and yttrium; the phase balance depends on the plasma-cooling regime. Post-processing by gravitational and magnetic separation improves powder recovery and purity. For final conditioning, the oxides were incorporated into chloride-based melts, yielding dense, chemically and thermally stable solid forms after solidification. These results demonstrate that plasma treatment can integrate waste destruction, oxidation, and immobilization within a single technological workflow, reducing external heat demand and enabling robust products for storage or further use. The findings provide an engineering basis for scaling plasma systems for radioactive-waste management with an emphasis on safety, efficiency, and sustainability Текстовый файл AM_Agreement |
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2025
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| Online Access: | https://doi.org/10.1134/S106287382571459X |
| Format: | Electronic Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=684364 |