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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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2024 ANS Annual Conference
June 16–19, 2024
Las Vegas, NV|Mandalay Bay Resort and Casino
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The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
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Fusion Science and Technology
Latest News
NRC Hanson's renomination clears Senate committee
Hanson
The U.S. Senate Environment and Public Works Committee voted 18–1 yesterday to advance the renomination of Christopher T. Hanson as a member of the Nuclear Regulatory Commission. Hanson has been a commissioner since 2020, and was named chair by President Biden in January 2021. The full U.S. Senate will consider Hanson’s nomination later this month.
Voices of support: “Chair Hanson is a dedicated public [servant] who has thoughtfully and . . . skillfully led the [NRC] during his tenure as its chair. Throughout his time on the[NRC], he has demonstrated his commitment to ensuring the safety and the security of our nation’s use of nuclear energy,” said EPW committee chair Tom Carper (D., Del.) before the vote.
George Tsotridis
Fusion Science and Technology | Volume 32 | Number 1 | August 1997 | Pages 35-44
Technical Paper | First-Wall Technology | doi.org/10.13182/FST97-A19878
Articles are hosted by Taylor and Francis Online.
Plasma-facing components in tokamak-type fusion reactors are subjected to intense heat loads during plasma disruptions, which causes melting and evaporation of the surface layer. The influence of the beam cross section of the incident energy on the depths of heat-affected zones on pure tungsten metal has been studied by using a two-dimensional transient computer model that solves the equations of motion and energy. Results are presented for relatively long disruption times for different beam cross sections and for a range of energy densities. It is demonstrated that there exists a critical value of cross-section area beyond which any further increase has no appreciable influence on the resulting depths of molten layers. It is also demonstrated that as the cross section increases, the convective flows caused by surface tension gradients resulting from variations of surface impurities are confined at regions close to the periphery of the molten zone, whereas at the center of the molten pool, heat is transported in the molten metal by conduction. It is demonstrated that by increasing the beam cross-section area, the resulting depths of molten layers increase. However, there exists a critical value of cross section beyond which the resulting molten layer depths are invariant to the beam cross section. It is further appreciated that there are other important phenomena taking part during plasma disruptions, such as electromagnetic forces, but at this stage, such influences on the molten layers will not be studied. Nevertheless, the influence of the beam cross-sectional area would be of similar importance.