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Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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Fusion Science and Technology
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Deep Space: The new frontier of radiation controls
In commercial nuclear power, there has always been a deliberate tension between the regulator and the utility owner. The regulator fundamentally exists to protect the worker, and the utility, to make a profit. It is a win-win balance.
From the U.S. nuclear industry has emerged a brilliantly successful occupational nuclear safety record—largely the result of an ALARA (as low as reasonably achievable) process that has driven exposure rates down to what only a decade ago would have been considered unthinkable. In the U.S. nuclear industry, the system has accomplished an excellent, nearly seamless process that succeeds to the benefit of both employee and utility owner.
M. Yokoyama, A. Wakasa, S. Murakami, K. Y. Watanabe, S. Satake, S. Nishimura, H. Sugama, N. Nakajima, H. Funaba, Y. Nakamura
Fusion Science and Technology | Volume 58 | Number 1 | July-August 2010 | Pages 269-276
Chapter 6. 3-D Theory | Special Issue on Large Helical Device (LHD) | doi.org/10.13182/FST10-A10813
Articles are hosted by Taylor and Francis Online.
This paper reviews how neoclassical (NC) transport analyses have been exploited to predict/understand the improved confinement achieved in the Large Helical Device (LHD), such as high-temperature and/or high-density regimes. Recent high-performance LHD plasmas have provided a good opportunity to test/verify the impact of the radial electric field (Er) for reducing the NC transport in the low-collisionality regime. The bifurcative nature of Er to the electron root was clarified to be the background physics for the improved electron heat confinement in the core region. The ion root has been verified with measurement as predicted from the NC ambipolarity for the high-ion temperature plasmas. The construction of the NC diffusion coefficient database has been advanced for making accurate and fast NC calculations available. The predicted dependence of the bootstrap current on the magnetic configuration has also been experimentally verified. The extension of NC transport theory itself has been greatly motivated by the extension of the plasma parameters. Code development for the inclusion of the finite orbit width effect and the progress of the moment approach are explained as such examples.
