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Fusion Science and Technology
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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.
Hisamichi Funaba, Kiyomasa Watanabe, Satoru Sakakibara, Ichihiro Yamada, Kenji Tanaka, Tokihiko Tokuzawa, Masaki Osakabe, Yoshiro Narushima, Noriyoshi Nakajima, Masayuki Yokoyama, Hiroshi Yamada, Osamu Kaneko, Kazuo Kawahata, LHD Experimental Group, Sadayoshi Murakami
Fusion Science and Technology | Volume 51 | Number 1 | January 2007 | Pages 129-137
Technical Paper | Stellarators | doi.org/10.13182/FST07-A1294
Articles are hosted by Taylor and Francis Online.
Local transport properties of high-beta plasmas in the Large Helical Device are studied by comparing the beta dependence of the experimental results with that of the gyro-reduced Bohm-type transport coefficients. The gradual degradation of global confinement in the high-beta regime seems to be mainly caused by the increment in the local transport at the peripheral region. Effects of the resistive pressure-gradient-driven (g-mode) turbulence on the peripheral transport are also studied. The comparison of the experimental transport coefficients and the calculation results shows that the resistive g-mode can be considered as one of the causes of this degradation.