|About this Abstract
||Materials Science & Technology 2012
||Materials Issues in Nuclear Waste Management in the 21st Century
||Determining Thermal Conductivity of Simulated Feed for High Level Waste Glass
||Jarrett Rice, Pavel Hrma, Richard Pokorny
|On-Site Speaker (Planned)
Stabilizing radioactive and chemical waste in the form of glass requires a mixture of waste and glass-forming additives to be charged to a joule-heated melter where it forms a cold-cap—a layer of the dry reacting feed floating on top of the pool of molten glass. The heat conductivity of the cold cap directly affects the rate of melting. With an assembly of thermocouples we measured heat conductivity in a large cylindrical crucible that was filled with a simulated high-level-waste feed and heated at a constant rate. Since the evolving temperature field was also influenced by the enthalpies of the feed reactions, we determined their kinetics using thermal analysis. Finally, we used numerical analysis to obtain the heat conductivity as a function of temperature. The results will be used for the development of mathematical model of the cold cap, an essential tool to develop feeds with high melting rates.