ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
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Division Spotlight
Thermal Hydraulics
The division provides a forum for focused technical dialogue on thermal hydraulic technology in the nuclear industry. Specifically, this will include heat transfer and fluid mechanics involved in the utilization of nuclear energy. It is intended to attract the highest quality of theoretical and experimental work to ANS, including research on basic phenomena and application to nuclear system design.
Meeting Spotlight
Utility Working Conference and Vendor Technology Expo (UWC 2024)
August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
Standards Program
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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Latest News
Vogtle-3 shuts down for valve issue
One of the new Vogtle units in Georgia was shut down unexpectedly on Monday last week for a valve issue that has since been investigated and repaired. According to multiple local news outlets, Georgia Power reported on July 17 that Unit 3 was back in service.
Southern Company spokesperson Jacob Hawkins confirmed that Vogtle-3 went off line at 9:25 p.m. local time on July 8 “due to lowering water levels in the steam generators caused by a valve issue on one of the three main feedwater pumps.”
Tsutomu Ikeno, Takeo Kajishima
Nuclear Technology | Volume 158 | Number 2 | May 2007 | Pages 249-260
Technical Paper | Nuclear Reactor Thermal Hydraulics | doi.org/10.13182/NT07-A3840
Articles are hosted by Taylor and Francis Online.
A computational model based on a large-eddy simulation (LES) technique was proposed to estimate turbulent mixing and pressure drop in subchannels with grid spacers. For an efficient treatment of this complex geometry, improvements were made to the LES technique coupled with an immersed boundary method: A one-equation dynamic subgrid scale model was introduced to account for the complex geometry without any artificial modification; the higher order accuracy was maintained by a consistent treatment of boundary conditions for velocity and pressure on solid walls. Computations were carried out for each of the convolute and periodic arrangements with two-step inclinations of the mixing vanes. The results reasonably reproduced the geometric effect in the turbulent mixing and drag coefficients for the flow, including unsteady separation and multiple vortices. The present computational model is useful for designing grid spacers: By coarser mesh, one can screen several candidates for spacer design; by finer mesh, more quantitative analysis is possible.