Year
2024
Abstract
| AbstractThermal Calculation for Plasma as A Technique for Treatment of a Radioactive Aqueous Organic Sample as Well as Study on the Analysis of Caf2 and Baf2 Crystals' Elemental Composition and Optical Characteristics Before and After Neutron Irradiation one of the challenges with nuclear energy is the management of radioactive waste (RW) to ensure the safety of the nuclear field.The concept of the closed nuclear fuel cycle provides for the disposal of all types ofof RW with the production of solid products suitable for long-term storage. The specificity of RW is that the only acceptable method of their relative decontamination is storage for a long time to decay the radionuclides contained in them. The existing technology for the disposal of SNF processing waste (SNF PW) in the form of water solutions with a low content of actinides and non-radioactive decay products (Mo, REE, etc.) The use of gas-discharge plasma to obtain oxide compounds from dispersed water solutions of SNF PW provides a single-stage and high-speed process. However, plasma processing of only water solutions requires significant energy consumption (up to 4 kW· h/kg) and does not provide plasma chemical synthesis of oxygen compounds of the required composition in air plasma without additional hydrogen reduction.It will be necessary to implement the gas cleaning system, considering the presence of radionuclides.I. The research will provide a review and analysis of methods for the disposal of spent nuclear fuel (SNF) reprocessing waste. The process of plasma disposal for secondary waste in the form of water-salt organic compositions will be chosen.II. Calculation of indicators of flammability of water-salt-organic compositions (WSOC) on the basis of SNF processing wastes will be carried out. The influence of the organic component (TBP) on the adiabatic combustion temperature will be established.III. In the realized prime experiments, the following hybrid torch properties and conditions will be studied:· Parallel start-up of DC and RF plasma torches.· Stability of the RF and DC discharge at the expense of gas flow effect. The inherent stabilization of the plasma by the swirl effect (vortex) serves to insulate the plasma from the combustor walls, thereby allowing the contained gas to be heated by the plasma and preventing excessive heat loss and damage to the walls.· Durability of the RF and DC discharge at the expense of reverse gas, both for arc torch and RF torch gas.A significant reduction in energy consumption and obtaining oxide compounds of the required composition with a uniform distribution of phases can be achieved by air-plasma processing of dispersed water-salt organic solutions that are optimal in composition and include an organic component (alcohols, ketones).As a result of processing,· The volume of waste will be reduced, and the radionuclides will be concentrated.· The radionuclides will be safely immobilized in the resulting product and cannot penetrate into the environment.· After the treatment of the RW is finalized, the inert slag will be disposed of in the normal way: by burial or long-term storage. |