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Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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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.
T. Numakura, T. Cho, J. Kohagura, M. Hirata, R. Minami, K. Yatsu, S. Miyoshi
Fusion Science and Technology | Volume 43 | Number 1 | January 2003 | Pages 222-224
Stability | doi.org/10.13182/FST03-A11963599
Articles are hosted by Taylor and Francis Online.
The effects of the thermal-barrier potentials ɸb on the central-cell electron energy confinement are theoretically and experimentally investigated in the GAMMA 10 tandem mirror. In particular, the scaling of the central-cell electron temperatures Te with “the central-cell electron-confining potentials” ɸb is studied on the basis of the electron energy-balance equation and the generalized Pastukhov theory. The obtained theoretical scaling of Te with ɸb is then compared with the experimentally observed relation between these two parameters. In GAMMA 10, the main tandem-mirror operations are characterized in terms of(i) a high-potential mode having kV-order plasma-confining potentials, and (ii) a hot-ion mode yielding fusion neutrons with 10-20 keV bulk-ion temperatures. In this report, the scaling of Te with ɸb covering over these two representative operational modes is investigated, since the scalings of Te or the dominant parameters which determine Te have been remained for a long time as an unresolved important issue for tandem-mirror plasmas. It is found that the data in the two representative operational modes of the high-potential and hot-ion modes in the GAMMA 10 tandem mirror are in good agreement with the theoretically derived scaling formula, though the heating-source parameter dependence in the electron energy-balance equation is quite different in the two modes.
