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Isotopes & Radiation
Members are devoted to applying nuclear science and engineering technologies involving isotopes, radiation applications, and associated equipment in scientific research, development, and industrial processes. Their interests lie primarily in education, industrial uses, biology, medicine, and health physics. Division committees include Analytical Applications of Isotopes and Radiation, Biology and Medicine, Radiation Applications, Radiation Sources and Detection, and Thermal Power Sources.
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Fusion Science and Technology
House Dems introduce clean energy bill for net zero
Democratic leaders in the House last week introduced the Climate Leadership and Environmental Action for our Nation’s Future Act (the CLEAN Future Act, or H.R. 1512), a nearly 1,000-page piece of climate change–focused legislation establishing, among other things, a federal clean electricity standard that targets a 50 percent reduction in greenhouse gas emissions from 2005 levels by 2030 and net-zero emissions by 2050.
The bill, a draft version of which was released in January 2020, presents a sweeping set of policy proposals, both sector-specific and economy-wide, to meet those targets. The final version includes a number of significant revisions to bring the legislation into closer alignment with President Biden’s climate policy campaign pledges. For example, the bill’s clean electricity standard would require all retail electricity suppliers to provide 80 percent clean energy to consumers by 2030 and 100 percent by 2035. (A six-page fact sheet detailing the updates is available online.)
R. E. Nygren
Fusion Science and Technology | Volume 47 | Number 3 | April 2005 | Pages 549-553
Technical Paper | Fusion Energy - First Wall, Blanket, and Shield | dx.doi.org/10.13182/FST05-8
Articles are hosted by Taylor and Francis Online.
Investigations of designs with a flowing free-surface molten salt as a first wall in the Advanced Power Extraction (APEX) Program led to questions concerning the liquidus temperature and solidification processes for the [1:1:1] composition in the LiF, BeF2 and NaF system. Sandia experiments, reported in this conference, showed a liquidus temperature near 425°C for the [1:1:1] composition. We also identified other compositions that showed congruent (eutectic) solidification and had sufficiently low melting temperatures (~305-320°C) to be useful in this application. Further characterization of these materials is necessary to evaluate their potential. This paper summarizes a 3-D finite element analysis of the experiment that evaluates thermal gradients in the salt pool and crucible, reproduces the "thermal plateau" associated with the isothermal freezing of a eutectic, and compares the calculated temperatures with readings from the three thermocouples in the experiment.