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NRC updating GEIS rule for new nuclear technology
The Nuclear Regulatory Agency is issuing a proposed generic environmental impact statement (GEIS) for use in reviewing applications for new nuclear reactors.
In an April 17 memo, NRC secretary Carrie Safford wrote that the commission approved NRC staff’s recommendation to publish in the Federal Register a proposed rule amending 10 CFR Part 51, “Environmental Protection Regulations for Domestic Licensing and Related Regulatory Functions.”
K. Nagaoka, Y. Takeiri, S. Morita, K. Ida, M. Yokoyama, M. Yoshinuma, H. Funaba, S. Murakami, T. Minami, K. Tanaka, T. Ido, A. Shimizu, K. Ikeda, M. Osakabe, K. Tsumori, O. Kaneko, LHD Experiment Group
Fusion Science and Technology | Volume 58 | Number 1 | July-August 2010 | Pages 46-52
Chapter 3. Confinement and Transport | Special Issue on Large Helical Device (LHD) | doi.org/10.13182/FST58-46
Articles are hosted by Taylor and Francis Online.
Ion heating experiments have been intensively carried out in high- and low-Zeff conditions of Large Helical Device plasmas. In high-Zeff plasmas utilizing neon or argon gus puffing, the ion heating power normalized by ion density (Pi /ni) increases with ZeffL and the central ion temperature increases with Pi /ni without saturation. The central ion temperature of 13.5 kV was achieved in an argon-seeded plasma, strongly suggesting the capability of the helical configuration to confine high-performance plasmas. In low-Zeff experiments, improvement of ion heat transport was realized in the core plasmas heated by high-power neutral beam injections. The ion temperature has a peaked profile with steep gradient in the core region (ion internal transport barrier). The transport analysis indicates that the anomalous transport is reduced in the core region, where the negative radial electric field is predicted by the neoclassical ambipolarity. Improvement of ion heat transport with positive radial electric field was also successfully demonstrated utilizing strongly focused electron cyclotron resonant heating, suggesting further improvement of ion heat transport in reactor-relevant plasmas.