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Division Spotlight
Thermal Hydraulics
The division provides a forum for focused technical dialogue on thermal hydraulic technology in the nuclear industry. Specifically, this will include heat transfer and fluid mechanics involved in the utilization of nuclear energy. It is intended to attract the highest quality of theoretical and experimental work to ANS, including research on basic phenomena and application to nuclear system design.
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.”
Y. Miura, M. Mori, T. Shoji, H. Matsumoto, K. Kamiya, K. Ida, S. Kasai
Fusion Science and Technology | Volume 49 | Number 2 | February 2006 | Pages 96-121
Technical Paper | JFT-2M Tokamak | doi.org/10.13182/FST06-A1090
Articles are hosted by Taylor and Francis Online.
The flexible mid-sized machine of JFT-2M has contributed to the understanding of the physics of improved confinement and the control of improved discharges using some innovative techniques. The improved confinement modes achieved during additional heating on JFT-2M were H-mode in both divertor and limiter configurations, improved L-mode, counter-neutral-beam injection, and pellet-injected H-mode. These improved modes are characterized by two improvements: (a) H-mode that has sharp density and temperature gradients at the edge and (b) other modes that have peaked density, temperature, and toroidal rotation profiles near the center. The improvement of pellet-injected H-mode achieved by central fueling was a combination of H-mode and core improvement with peaked profiles. The discovery of limiter H-mode had an impact on the physics understanding of H-mode and showed the formation of a transport barrier at a place without discontinuity of the magnetic field line topology. The appearance of edge-localized modes (ELMs) by applying ergodic fields was investigated, and it was clarified that n 4 helical components were effective in producing ELMs. Scrape-off-layer biasing had the effect of compressing neutrals at the divertor region. It would be understood that compressed neutrals at the divertor region might increase banana ion loss through charge exchange and increase the negative radial electric field inside the separatrix. This situation would reduce the H-mode power threshold. High-recycling-steady (HRS) H-mode could be reproducibly obtained by boronization using tri-methyl-boron. It was found that HRS appears at a pedestal collisionality of e* > 1.