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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.”
L. A. El-Guebaly, H. Y. Khater
Fusion Science and Technology | Volume 30 | Number 3 | December 1996 | Pages 1589-1593
Fusion Power Plants and Economics | doi.org/10.13182/FST96-A11963178
Articles are hosted by Taylor and Francis Online.
Recent interest in the low aspect ratio (LAR) concept has led the U.S. ARIES team to examine the credibility of this advanced concept as a future source of fusion energy. The compactness of the LAR machine imposes severe constraints on the Cu center post (CP) which thus plays an important role in the design. In view of the fact that the machine operates for 40 y with a relatively high neutron wall loading of 4 MW/m2, the CP will be operating in a severe radiation environment for an extended period of time. The analysis indicated that the lifetime of the CP is limited by the Class C low level waste disposal requirements. Identification of potential radioactive waste problems for the Cu conductor has resulted in either limiting the lifetime of the unshielded CP to 0.12 FPY (corresponding to a fluence of 0.3 MWy/m2) or shielding the CP with 20-30 cm of shield. Since it is not feasible to replace hundreds of tonnes of Cu every 2 months, the CP should be shielded to prolong the lifetime to 4 years or more, reduce the cumulative radwaste and replacement cost, increase the system availability, and alleviate most of the CP radiation damage problems. We have assessed the effects of neutron fluence on conductor resistivity, swelling, and atomic displacement. Even though the radiation-induced swelling and changes to Cu resistivity due to transmutations are small at 0.3 MWy/m2, there is serious concern about the degradation of properties as all Cu alloys experience hardening and loss of ductility under neutron irradiation.