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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.
S. K. Combs, L. R. Baylor, D. T. Fehling, P. W. Fisher, C. R. Foust, D. A. Rasmussen, J. B. Wilgen, B. E. Chapman, S. P. Oliva, S. C. Prager, J. S. Sarff, M. D. Wyman, D. L. Brower, W. X. Ding, S. D. Terry, B. H. Deng
Fusion Science and Technology | Volume 44 | Number 2 | September 2003 | Pages 513-517
Technical Paper | Fusion Energy - Plasma Engineering, Heating, and Current Drive | doi.org/10.13182/FST03-A388
Articles are hosted by Taylor and Francis Online.
A compact pellet injection system that was recently developed at the Oak Ridge National Laboratory has been installed on the Madison Symmetric Torus (MST) at the University of Wisconsin and used in initial plasma fueling experiments. The system, referred to as a "pellet injector in a suitcase," is a pipe gun device with a four-barrel capability (presently equipped with two 1.0-mm-bore barrels), and it uses a cryogenic refrigerator for in-situ hydrogen pellet formation (typically, D2 pellets). This new, portable, stand-alone pellet injection system was developed to provide a flexible means of plasma fueling on a wide variety of magnetic confinement devices, with relatively low costs for installation and operation. The injector has already been used to produce useful results with pellets on MST plasmas, including significant and rapid increases (almost 100%) in the line average density, and effectively depositing fuel in the plasma core (central densities of [approximately equal to] 1.4 × 1019 m-3). In this paper, the injection system, its performance, and reliability will be described, and results from some initial MST pellet experiments will be highlighted.