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Division Spotlight
Radiation Protection & Shielding
The Radiation Protection and Shielding Division is developing and promoting radiation protection and shielding aspects of nuclear science and technology — including interaction of nuclear radiation with materials and biological systems, instruments and techniques for the measurement of nuclear radiation fields, and radiation shield design and evaluation.
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.”
Ikuhide Tokami, Masataka Nakahira, Satoshi Sato, Kazuyuki Furuya, Toshihisa Hatano, Toshimasa Kuroda, Hideyuki Takatsu
Fusion Science and Technology | Volume 30 | Number 3 | December 1996 | Pages 574-578
International Thermonuclear Experimental Reactor | doi.org/10.13182/FST96-A11963000
Articles are hosted by Taylor and Francis Online.
A modular blanket has been proposed for a fusion experimental reactor, such as ITER, to enhance its maintainability as well as improve its fablicability. The blanket module is connected to a strong back plate via support legs protruded from both of the module and the back plate. A welding approach has been investigated for the joining of the support leg that is 70 mm thick to withstand electromagnetic forces and with limited welding/cutting heads working space of 100 mm × 150 mm adjacent to the support leg.
After comparison of several methods, e.g. NGTIG, NGMIG and iodine laser, NGTIG has been selected as a reference for welding and plasma cutting for cutting. Iodine laser has been chosen as an alternative for both of welding and cutting. Through preliminary design studies, the possibility of small welding/cutting heads including their driving systems available to the limited space has been shown. Maintenance route for in-situ module replacement with temporary fixture jigs has been also investigated.