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Conference Spotlight
2025 ANS Winter Conference & Expo
November 9–12, 2025
Washington, DC|Washington Hilton
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Latest News
Senate EPW Committee to hold Nieh nomination hearing
Nieh
The Senate Environment and Public Works Committee will hold a nomination hearing Wednesday for Ho Nieh, President Donald Trump’s nominee to serve as commission at the Nuclear Regulatory Commission.
Trump nominated Nieh on July 30 to serve as NRC commissioner the remainder of a term that will expire June 30, 2029, as Nuclear NewsWire previously reported.
Nieh has been vice president of regulatory affairs at Southern Nuclear since 2021, though since June 2024 he has been at the Institute of Nuclear Power Operations as a loaned executive.
A return to the NRC: If confirmed by the Senate, Nieh would be returning to the NRC after three previous stints totaling nearly 20 years.
Avinash Kumar Acharya, E. Hemanth Rao, M. Menaka, Sanjay Kumar Das, D. Ponraju, B. Venkatraman
Nuclear Technology | Volume 209 | Number 9 | September 2023 | Pages 1351-1364
Research Article | doi.org/10.1080/00295450.2023.2199079
Articles are hosted by Taylor and Francis Online.
Sodium boiling in a fuel subassembly of a sodium-cooled fast breeder reactor is a very critical phenomenon as void propagation may lead to loss of heat removal and increase in reactivity. Hence, sodium boiling behavior from the incipient stage and evolution of bubble dynamics need to be thoroughly understood toward validating various thermal-hydraulic models pertaining to safety analysis of fast reactors. An experimental program has been taken up at Indira Gandhi Centre for Atomic Research to investigate incipient sodium boiling toward spatiotemporal evaluation of bubble characteristics in sodium. Real-time X-ray radioscopy has been employed for in-sodium visualization of bubbles generated during sodium boiling. The raw images obtained during the experiment were processed using an in-house–developed image processing algorithm that includes background subtraction, noise filtering, and segmentation techniques for enhancement of foreground features. A max filter–based tracker is also devised for clear depiction of bubble boundary and motion with time during the boiling process. Attributes like bubble diameter, nucleation site density, and bubble velocity are determined effectively from the captured images using the algorithm. The paper focuses on the experiment, imaging technique using X-ray radioscopy, and image processing toward depicting the bubble characteristics during sodium boiling in a vertical channel.