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Fusion Science and Technology
Latest News
Glass strategy: Hanford’s enhanced waste glass program
The mission of the Department of Energy’s Office of River Protection (ORP) is to complete the safe cleanup of waste resulting from decades of nuclear weapons development. One of the most technologically challenging responsibilities is the safe disposition of approximately 56 million gallons of radioactive waste historically stored in 177 tanks at the Hanford Site in Washington state.
ORP has a clear incentive to reduce the overall mission duration and cost. One pathway is to develop and deploy innovative technical solutions that can advance baseline flow sheets toward higher efficiency operations while reducing identified risks without compromising safety. Vitrification is the baseline process that will convert both high-level and low-level radioactive waste at Hanford into a stable glass waste form for long-term storage and disposal.
Although vitrification is a mature technology, there are key areas where technology can further reduce operational risks, advance baseline processes to maximize waste throughput, and provide the underpinning to enhance operational flexibility; all steps in reducing mission duration and cost.
B. Zurro, A. Baciero, D. Rapisarda, V. Tribaldos, TJ-II Team
Fusion Science and Technology | Volume 50 | Number 3 | October 2006 | Pages 419-427
Technical Paper | Stellarators | doi.org/10.13182/FST06-A1264
Articles are hosted by Taylor and Francis Online.
The poloidal rotation of C V ions has been deduced, in the TJ-II stellarator, from spectral line shifts measured using a high-spectral-resolution spectrometer and a nine-fiber-channel system. Analysis of the data obtained has shown that a change of sign of the poloidal rotation direction occurs that depends abruptly on plasma density but is independent of the heating method. Whereas in low-density plasmas the poloidal direction corresponds to a positive radial electric field, at higher densities negative radial electric fields are deduced from the measured poloidal rotation. These measurements are in qualitative agreement with neoclassical theory calculations that predict a change in the sign of the radial electric field mainly because of a change in the ratio of the electron-to-ion temperature.