Chemical and evaporative behaviors of synthetic liquid nuclear waste [thesis]

Donna MacGrath Cline
In the 1960's the Department of Energy at Oak Ridge National Laboratory designed eight 50,000 gallon storage tanks for the liquid nuclear waste. Each tank was designed with its own ventilation system to purge radiolytic hydrogen and oxygen from the tank. This design induced water removal and necessitated the additional requirement ofentraining radioactivity from the exiting system by the use of demisters and HEPA filters. Up until the 1980's this was a sufficient method, via the hydrofracture
more » ... ocess, of disposing the liquid nuclear waste. However since then, this method has been terminated and the tanks are nearing capacity. In the transfer of the liquid waste to the holding tanks, large amounts of water are used to prevent line clogging and solid build up in the pipes. Utilizing the existing system, this thesis proposes the idea of sparging air into the liquid waste and increasing the tank temperature in order to eliminate excess water. Parameters such as increasing the sparging air temperature, and dehumidifying and eliminating carbon dioxide from the sparging air, are investigated theoretically and experimentally in small scale experiments. In addition, the effects of vapor pressure lowering and its simultaneous effect on the evaporation rate are investigated through the activity coefficient of sodium nitrate, the major component of the liquid waste. Precipitate blockage formations in the sparging tube have also been addressed.
doi:10.25148/etd.fi14060860 fatcat:u2jypmgiq5b2pekkrju5eyx3pi