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Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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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
ANS joins others in seeking to discuss SNF/HLW impasse
The American Nuclear Society joined seven other organizations to send a letter to Energy Secretary Christopher Wright on July 8, asking to meet with him to discuss “the restoration of a highly functioning program to meet DOE’s legal responsibility to manage and dispose of the nation’s commercial and legacy defense spent nuclear fuel (SNF) and high-level radioactive waste (HLW).”
A. Khodak, P. Titus, I. Zatz, A. Nagy, J. Winkelman, R. Nazikian, T. Scoville
Fusion Science and Technology | Volume 68 | Number 2 | September 2015 | Pages 373-377
Technical Paper | Proceedings of TOFE-2014 | doi.org/10.13182/FST14-951
Articles are hosted by Taylor and Francis Online.
The neutral beam copper pole shields currently in service at DIII-D have experienced localized melting and fatigue cracks in the grooves machined in the back of the copper plates. Higher power is now desired out of the neutral beams, requiring a pole shield upgrade to handle the elevated thermal load. The Princeton Plasma Physics Laboratory is responsible for the design and manufacturing of the pole shield upgrade.
Since the heat flux on the pole shield is highly localized, the new design includes a molybdenum insert, positioned in the area of the maximum thermal loading, mounted in the copper plate, which is cooled by a single cooling channel. A ten segment design was implemented, with loose tongue and groove connections, to allow in situ assembly and maintenance.
To validate the design, numerical simulations were performed using ANSYS workbench and consisted of two stages: 1. during the first stage unsteady fluid flow simulation was performed in conjunction with heat transfer analysis in the insert, copper plate, and water cooling system; 2. during the second stage, the temperature distribution was used to specify thermal strains, and perform transient structural analysis.