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
Reactor Physics
The division's objectives are to promote the advancement of knowledge and understanding of the fundamental physical phenomena characterizing nuclear reactors and other nuclear systems. The division encourages research and disseminates information through meetings and publications. Areas of technical interest include nuclear data, particle interactions and transport, reactor and nuclear systems analysis, methods, design, validation and operating experience and standards. The Wigner Award heads the awards program.
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.”
Rae-Joon Park, Sang-Baik Kim, Hee-Dong Kim, Sang-Min Choi
Nuclear Technology | Volume 127 | Number 1 | July 1999 | Pages 66-80
Technical Paper | Thermal Hydraulics | doi.org/10.13182/NT99-A2984
Articles are hosted by Taylor and Francis Online.
An experimental study has been performed on natural convection heat transfer with and without crust formation in a molten metal pool. Two types of steady-state tests, natural and forced convection coolings of the molten metal pool, were performed in low- and high-aspect-ratio cases. When the natural convection flow is developed in the molten metal pool, the overlying coolant conditions do not affect the crust formation. On the other hand, when the natural convection flow is not developed, the coolant conditions affect the crust formation. The heat transfer rate of cases with crust formation is lower than that of cases without crust formation due to the effect of the crust serving as a thermal barrier. The present experimental results on the relationship between the Nusselt number and Rayleigh number match better with Globe and Dropkin's correlation than any others. With an increase in the crust thickness, the Nusselt number in the metal pool does not rapidly decrease in spite of a rapid decrease in Rayleigh number because the aspect ratio of the metal pool decreases. A new correlation between the Nusselt number and Rayleigh number in the molten metal pool with crust formation has been developed as Nu = 0.0923 (Ra)0.302 (2 × 104 < Ra < 2 × 107).