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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!
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Nuclear Science and Engineering
August 2024
Nuclear Technology
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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.”
Tetsuo Sawada, Hisashi Ninokata, Hirofumi Tomozoe, Hiroshi Endo
Nuclear Technology | Volume 130 | Number 3 | June 2000 | Pages 242-251
Technical Paper | Fission Reactors | doi.org/10.13182/NT130-242
Articles are hosted by Taylor and Francis Online.
An outline is given of simple evaluation models for a recriticality in an attempt to construct a fast reactor core that has high potential to terminate an accident and prevent its progression, under postulated core-damage conditions, into further disruption of the degraded core and into possible recriticality leading to an energetic power excursion. The basic idea to prevent recriticality events is to remove a certain amount of fuel material out of the core in order to keep the core subcritical. Based on the simplified models, general guidelines are given that minimize the amount of fuel removal necessary to avoid recriticality events. Multigroup two-dimensional diffusion calculations are also performed to ascertain the tendency obtained by the simple model for the reactivity insertion due to a core collapse. In the sense of controlled material relocation, the fraction of core materials is identified that should be preferentially removed out of the core to eliminate the recriticality potential.