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Division Spotlight
Young Members Group
The Young Members Group works to encourage and enable all young professional members to be actively involved in the efforts and endeavors of the Society at all levels (Professional Divisions, ANS Governance, Local Sections, etc.) as they transition from the role of a student to the role of a professional. It sponsors non-technical workshops and meetings that provide professional development and networking opportunities for young professionals, collaborates with other Divisions and Groups in developing technical and non-technical content for topical and national meetings, encourages its members to participate in the activities of the Groups and Divisions that are closely related to their professional interests as well as in their local sections, introduces young members to the rules and governance structure of the Society, and nominates young professionals for awards and leadership opportunities available to members.
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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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.”
E. Tucker, J. Gilligan
Fusion Science and Technology | Volume 26 | Number 4 | December 1994 | Pages 1265-1274
Technical Paper | First-Wall Technology | doi.org/10.13182/FST94-A30311
Articles are hosted by Taylor and Francis Online.
Energetic (> 10-keV) particles incident on divertor plate surfaces may penetrate the vapor shield formed under extremely high heat flux conditions (> 1010 W/m2). In this case, the total energy transmission factor f through the vapor shield can increase drastically, which leads to more surface damage. A one-dimensional time-dependent coupled magnetohydrodynamic-radiation transport code MAGFIRE, originally used in modeling the vapor shield development under a blackbody radiation source, has been modified to include a charged-particle source. The sources used to model a disruption are monoenergetic beams of electrons and/or deuter-ons with any given incident heat flux and energy per particle. An electron source (≤20 keV) will eventually (for times ≤10 µs) be completely absorbed by the vapor resulting in f converging to the same f (for times ≥100 µs) as an equivalent ion heat flux source. Results show that in fact all three sources converge (at ∼100 µs) to the same steady-state value of f for any given heat flux. Results also show that steady-state f decreases for increasing heat fluxes on a carbon surface. Non-steady-state f, however, depends on total incident beam energy fluence and electron energy per particle. The energetic electron spectrum incident on divertor plates during a disruption needs to be measured on large tokamaks so that reliable simulation can be done for International Thermonuclear Experimental Reactor (ITER)-like conditions.