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
Nuclear Installations Safety
Devoted specifically to the safety of nuclear installations and the health and safety of the public, this division seeks a better understanding of the role of safety in the design, construction and operation of nuclear installation facilities. The division also promotes engineering and scientific technology advancement associated with the safety of such facilities.
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.”
Martha H. Redi, Samuel A. Cohen
Fusion Science and Technology | Volume 20 | Number 1 | August 1991 | Pages 48-57
Technical Paper | Fusion Reactor | doi.org/10.13182/FST91-A29642
Articles are hosted by Taylor and Francis Online.
The buildup of helium ash has been studied in a series of simulations with the BALDUR transport code in the proposed International Thermonuclear Experimental Reactor (ITER) experiment at low density = 8.3 × 1019/m−3. Sustained ignition is found to be possible only for RHe < 0.5 → 0.9, with lower values required at lower edge densities. Using radially dependent thermal diffusivities that were scaled from Joint European Torus (JET) values, the effects of particle transport coefficients and edge recycling on helium poisoning of ignition are studied. A sustained ignition is obtained when the exhaust of helium from the edge plasma is allowed to exceed 10% of the helium flux into the edge plasma from the core plasma, and the ratio of particle (helium ion) to thermal diffusivities, D/χ, is > ¼. The simulations include the effects of sawtooth oscillations, radiative as well as conductive energy loss channels, and density profile variations.