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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.
S. Morita, H. Yamada, R. Akiyama, A. Ando, H. Arimoto, K. Ida, H. Idei, H. Iguchi, O. Kaneko, S. Kubo, R. Kumazawa, K. Matsuoka, T. Minami, T. Morisaki, S. Muto, K. Narihara, K. Nishimura, S. Okamura, T. Ozaki, S. Sakakibara, C. Takahashi, K. Tanaka, J. Xu, I. Yamada
Fusion Science and Technology | Volume 27 | Number 3 | April 1995 | Pages 239-243
Helical Systems | doi.org/10.13182/FST95-A11947078
Articles are hosted by Taylor and Francis Online.
Particle confinement time τp has been obtained from measurements of poloidal and toroidal distributions of Ha and Lyman a emissions in CHS. These particle confinement times range between 1.5 and 4ms at a constant line-averaged density of 3×1013cm–3 for both cases of limiter- and divertor-dominated NBI plasmas with Ti-gettering. In these cases the energy confinement time τE were between 2 and 3ms. The density decay characteristic time τp* and global recycling coefficient R have been also measured for Ti-gettered plasmas and large τp* values were observed. As a result high recycling rates (R>0.92) are obtained for a wide density range. For a limiter-dominated case of boronized plasmas (Rax=92.1cm) values of τp were correlated with τE and a linear correlation between them was found for normalized τE to P-0.58 which is a power degradation term in LHD empirical scaling.
