ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Division Spotlight
Accelerator Applications
The division was organized to promote the advancement of knowledge of the use of particle accelerator technologies for nuclear and other applications. It focuses on production of neutrons and other particles, utilization of these particles for scientific or industrial purposes, such as the production or destruction of radionuclides significant to energy, medicine, defense or other endeavors, as well as imaging and diagnostics.
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!
Latest Magazine Issues
Jul 2024
Jan 2024
Latest Journal Issues
Nuclear Science and Engineering
August 2024
Nuclear Technology
Fusion Science and Technology
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.”
R. Jain, M. L. Corradini
Nuclear Technology | Volume 155 | Number 3 | September 2006 | Pages 312-323
Technical Paper | Thermal Hydraulics | doi.org/10.13182/NT06-A3764
Articles are hosted by Taylor and Francis Online.
Experiments were conducted in a rectangular supercritical carbon dioxide (SCCO2) natural-circulation loop at Argonne National Laboratory (ANL) in order to verify the stability margin as suggested by some previous investigators. Although a one-dimensional transient computational model developed at University of Wisconsin, Madison, predicted the development of instabilities for the SCCO2 loop, which had good agreement with some previous work, the experiments conducted at the ANL SCCO2 loop exhibited stable behavior under similar conditions. In order to bridge the gap between the numerical predictions and experimental results by distinguishing between the numerical effects and physical effects, a linear stability approach is adopted in the present study. The linear stability analysis has been conducted for three model natural-circulation loop geometries employing water or carbon dioxide as the working fluid. The results for the supercritical water loops displayed flow stability for a more accurate equation of state (EOS); however, the analysis indicated the presence of instabilities for a less accurate EOS. Furthermore, this analysis still predicts the presence of instabilities for the SCCO2 loop similar to our transient numerical predictions. We additionally note that the stability margin for both water loops and the SCCO2 loop does not correspond with proposed stability criteria from a previous analysis. These two final points suggest the phenomenon is a more complex function of both fluid properties and loop geometry.