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Radiation Protection & Shielding
The Radiation Protection and Shielding Division is developing and promoting radiation protection and shielding aspects of nuclear science and technology — including interaction of nuclear radiation with materials and biological systems, instruments and techniques for the measurement of nuclear radiation fields, and radiation shield design and evaluation.
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Utility Working Conference and Vendor Technology Expo (UWC 2024)
August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
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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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Constellation seeks rezone for property adjacent to Illinois plant
While no development details have been released, Constellation is asking to rezone 658.8 acres of land it owns around the Byron nuclear plant in Illinois for possible long-term use.
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.