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Decommissioning & Environmental Sciences
The mission of the Decommissioning and Environmental Sciences (DES) Division is to promote the development and use of those skills and technologies associated with the use of nuclear energy and the optimal management and stewardship of the environment, sustainable development, decommissioning, remediation, reutilization, and long-term surveillance and maintenance of nuclear-related installations, and sites. The target audience for this effort is the membership of the Division, the Society, and the public at large.
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Nuclear Science and Engineering
Fusion Science and Technology
New polls show substantial support for nuclear energy
Sixty percent of respondents in a recent national survey favored the use of nuclear energy, with only 25 percent opposing its use. While the latest Bisconti Research poll focuses on nuclear power and electricity generation, its findings on public interest in climate change and using a spectrum of sources to meet energy needs are consistent with a recent Pew Research Center poll on a broad set of energy policy and climate change topics. The approaches the two online surveys took to measuring public opinion on nuclear energy yielded different numbers but found some common ground.
B. Pégourié, Tore Supra Team
Fusion Science and Technology | Volume 56 | Number 3 | October 2009 | Pages 1334-1352
Technical Papers | Tore Supra Special Issue | dx.doi.org/10.13182/FST09-A9181
Articles are hosted by Taylor and Francis Online.
Fuel retention in carbon plasma-facing components (PFCs) is such a major concern for next-step operation that it could prevent the use of this material in the D-T phase of ITER. Because of its complete set of actively cooled PFCs, Tore Supra offers a unique opportunity to study this phenomenon in conditions where the plasma exposure time is much longer than the thermal equilibration time of the PFCs. In addition to the main characteristics of permanent retention measured during long-discharge operation, this paper discusses the different mechanisms possibly at work in the continuous increase of the in-vessel inventory and describes the morphology and physical properties of the deposits found at several locations in the vacuum chamber. The main results are (1) that D retention mainly depends on the lower hybrid power coupled to the plasma and, to a lesser extent, on the edge temperature and fueling method, (2) that permanent D retention is mainly due to codeposition, and (3) that the hydrogenated carbon deposits present at the surface of the different PFCs are strongly disorganized graphite carbons when they are exposed to high heat fluxes, whose formation occurs through a heterogeneous growth involving both codeposition of nanoparticles and basic structural unit vapor condensates.