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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.
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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.”
C. Poletiko, P. Trabuc, J. Durand, B. Tormos, L. Pignoly
Fusion Science and Technology | Volume 48 | Number 1 | July-August 2005 | Pages 194-199
Technical Paper | Tritium Science and Technology - Decontamination and Waste | doi.org/10.13182/FST05-A910
Articles are hosted by Taylor and Francis Online.
Due to its high diffusivity and different trapping phenomena, tritium is present in materials, such as steels which are in use in different parts of a nuclear power reactor or even in graphite which is present in fusion reactor.From waste management point of view, it is necessary to know as accurately as possible the tritium inventory in such materials before disposal. Moreover the knowledge of tritium species (HTO or HT. . .) is also a significant information in case of detritiation prior to storage, since countries regulation already limit tritium contents and releases. There are three different strategies for tritiated waste management. The first one consists in a storage with confinement packages the second one is waiting for radioactive decay. The third one consists in the application of detritiation processes.Studies have been performed to determine different processes that could be used for tritium removal. The aim of this paper was, to study, at laboratory scale, different procedures which may be used for stainless steels and carbon materials detritiation.Thermal detritiation kinetics till 1300 K has been studied under various atmospheres; full chemical dissolution of samples has also been performed both for steel and graphite, this to perfectly know the tritium content in such matrices. Finally a study of tritium content in steel layers has also been made, to learn about the tritium behaviour. All results are given, allowing the possibility to take a decision either for detritiation procedure or storage conditions.The main result is that thermal out-gassing enables higher than 95 % tritium extraction from the bulk at temperature in the range of 600K, without any material destruction under Hytec gas (Ar + 5% volume H2).