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Conference Spotlight
2025 ANS Winter Conference & Expo
November 9–12, 2025
Washington, DC|Washington Hilton
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A wave of new U.S.-U.K. deals ahead of Trump’s state visit
President Trump will arrive in the United Kingdom this week for a state visit that promises to include the usual pomp and ceremony alongside the signing of a landmark new agreement on U.S.-U.K. nuclear collaboration.
Rohan Biwalkar, Sola Talabi (Pittsburgh Technical)
Proceedings | Advances in Thermal Hydraulics 2018 | Orlando, FL, November 11-15, 2018 | Pages 989-1002
An Integrated Small Modular Reactor is an Integral Pressurized-Water Reactor (iPWR) with a relatively high surface-area-to-volume ratio. It has been hypothesized that a higher surface-area-to-volume ratio aids passive aerosol decontamination through various deposition phenomena, namely thermophoresis, diffusiophoresis and gravitational settling. Accordingly, particle deposition was studied within a range of thermal-hydraulic parameters, namely pressure, temperature and A/V ratios, in the presence as well as the absence of steam. It was found that presence of steam, an increasing thermal gradient between the Reactor Vessel (RV) and Containment Vessel (CV) walls, an increasing A/V ratio, and an increasing initial pressure enhance particle deposition. As part of this study, a Computational Fluid Dynamics (CFD) model with the capability to predict particle deposition, particle velocities and steam condensation was developed using User-Defined Functions for the 3-D CFD commercial code CONVERGE. It was found that the CFD results qualitatively agreed with the experimental data in the context of predicting particle deposition with respect to varying thermal-hydraulic parameters. Overall, the aerosol removal mechanisms are sensitive to varying thermal-hydraulic parameters.