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
Materials Science & Technology
The objectives of MSTD are: promote the advancement of materials science in Nuclear Science Technology; support the multidisciplines which constitute it; encourage research by providing a forum for the presentation, exchange, and documentation of relevant information; promote the interaction and communication among its members; and recognize and reward its members for significant contributions to the field of materials science in nuclear technology.
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.”
André L. Rogister
Fusion Science and Technology | Volume 37 | Number 2 | March 2000 | Pages 239-248
Instabilities and Transport | doi.org/10.13182/FST00-A11963219
Articles are hosted by Taylor and Francis Online.
Most experts consider that the causes of anomalous energy and particle transport in fusion devices are low frequency “drift” waves, themselves driven unstable by the equilibrium gradients and the associated drifts across the confining magnetic field (hence the terminology). We first introduce the dimensionless parameters which characterize drift waves (drift ordering). We then accordingly simplify the conventional two fluids description and obtain the general eigenvalue equations for drift eigenmodes. We finally search for solutions with angular frequency ω~ω* (the diamagnetic drift frequency), ω~λω*, etc … assuming λ≡LN(T)/qR ≪ 1 [LN(T) is the density (temperature) gradient length and qR is the connection length]. We recover in this way both the electron and the ion drift branches. The poloidal variation of the magnetic field has two opposite effects on the growth (damping) rate according to whether the width of the modes is larger or smaller than the distance between the rational surfaces q(r)=m/ℓ and q(r+Δ)=(m+l)/ℓ. Kinetic effects and the role of trapped particles are not described by the two fluid description but could be readily included.