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Conference Spotlight
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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Powering the future: How the DOE is fueling nuclear fuel cycle research and development
As global interest in nuclear energy surges, the United States must remain at the forefront of research and development to ensure national energy security, advance nuclear technologies, and promote international cooperation on safety and nonproliferation. A crucial step in achieving this is analyzing how funding and resources are allocated to better understand how to direct future research and development. The Department of Energy has spearheaded this effort by funding hundreds of research projects across the country through the Nuclear Energy University Program (NEUP). This initiative has empowered dozens of universities to collaborate toward a nuclear-friendly future.
Yiyang Zhang, Zhu Fang, Xinxin Wu, Haitao Wang, Libin Sun, Xiaowei Luo, Xiaowei Li (Tsinghua Univ)
Proceedings | 2018 International Congress on Advances in Nuclear Power Plants (ICAPP 2018) | Charlotte, NC, April 8-11, 2018 | Pages 84-93
The graphite dust, produced by friction of fuel pebbles, is a significant concern in potential accidents of HTGR because the graphite dust is closely coupled with radioactive fission product. The study of graphite particle-wall impaction is important to accurately estimate deposition rate of graphite dust. In this paper, both the spherical and non-spherical particle-wall impaction process are discussed based on FEM. By combining derived adhesion force with FEM, the results agree well with JKR model. The damping dissipation is employed to describe the energy loss, corresponding dimensionless damping coefficient is defined to establish the relation between damping coefficient and material properties. Meanwhile, the results of non-spherical particle impaction are also well predicted by dimensionless damping coefficient. It is also shown both adhesion force and damping dissipation are important at low incident velocity, while the effect of adhesion force is negligible and the dissipation is the dominant mechanism at high incident velocity. Besides, the contact area remains perfectly elastic deformation and never gets into failure when the incident velocity is lower than 20 m/s due to size effect. The results provide a possible approach for non-spherical particle-wall impaction, which can be combined with computational fluid dynamics (CFD) to estimate the deposition rate of graphite dust in HTGR.