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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.
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Utility Working Conference and Vendor Technology Expo (UWC 2024)
August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
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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.”
Hiroshi Horiike, Masato Akiba, Masanori Araki, Masaaki Kuriyama, Shinzaburo Matsuda, Mamoru Matsuoka, Yoshihiro Ohara, Yoshikazu Okumura, Kiyoshi Shibanuma, Shigeru Tanaka
Fusion Science and Technology | Volume 7 | Number 2 | March 1985 | Pages 171-179
Technical Paper | Plasma Heating System | doi.org/10.13182/FST85-A24532
Articles are hosted by Taylor and Francis Online.
Countermeasures against mechanical warpage of the extraction electrode for the JT-60 ion source were studied experimentally. A conventional plasma electrode, consisting of a single thin plate, exhibited unacceptably large deflections during long-pulse operation at extraction power levels exceeding 75 kV, 35 A. To measure the deflection characteristics of this electrode, hot water was circulated in the electrode cooling channels. Results from this test showed that an unacceptably large warpage occurs at temperatures moderately below the operation temperature. To suppress warpage, two modified electrodes were fabricated and tested. In the first design, the electrode was stiffened by adding material at the edges of the aperture area. In the second design, constraints on the thermal expansion of the aperture area were released by segmenting the aperture area and joining them to the stiff electrode frame through a bellows. Both designs successfully reduced electrode deflection and were used to extract 100-kV, 40-A, 10-s beams. These tests provided a measure of the permissible deflection level of the plasma electrode.