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Nuclear Installations Safety
Devoted specifically to the safety of nuclear installations and the health and safety of the public, this division seeks a better understanding of the role of safety in the design, construction and operation of nuclear installation facilities. The division also promotes engineering and scientific technology advancement associated with the safety of such facilities.
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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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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.”
A. Kumar, M.A. Abdou, Y. Ikeda, T. Nakamura
Fusion Science and Technology | Volume 19 | Number 3 | May 1991 | Pages 1909-1918
Neutronic | Proceedings of the Ninth Topical Meeting on the Technology of Fusion Energy (Oak Brook, Illinois, October 7-11, 1990) | doi.org/10.13182/FST91-A29621
Articles are hosted by Taylor and Francis Online.
The selection of materials and design options for fusion device components depends crucially on the level of radioactivity and decayheat induced in the components subject to D-T neutron irradiation. An experimental program was carried out to obtain decay γ emission spectra from samples of Fe, Ni, Cr, MnCu alloy, Ti, Mo, Zr, Ta, W, Si, Mg, Al, V, Nb, SS316, YBa2Cu3O7 and ErBa2Cu3O7, which were subjected to simulated fusion neutron environment. Cooling times obtained ranged from 10 min to 7 days. The experimental results have been analyzed using four leading radioactivity codes: DKRICF, REAC, RACC and THIDA. The integrated decay γ emission rates (over 100 KeV to 3 MeV) have been compared in addition to decay γ emission spectra. It is observed that : (i) generally, much better agreement is found between computed (C) and experimentally measured (E) values for integrated γ emission rates as against the detailed γ spectra, (ii) C/E ratios for integrated γ emission rates are found to range from 0.001 to 300, though most of the ratios cluster between 1 to 2. Significant discrepancies are obtained on C/E ratios for a number of cases for the four codes used above. Most of the observed discrepancies are due to (a) missing or wrong fundamental decay γ-ray data, e.g., (1) missing decay data in DKRICF for 186Ta, 187W, 181W, 90mY, 86Rb, 88Y, etc., (2) wrong decay γ-intensities for W products in THIDA, (b) inaccurate activation cross sections, e.g., for V, Zr, Mo in DKRICF, RACC, REAC, (c) errors on computed neutron energy spectra, (d) various experiment related factors, essentially poor counting statistics for weak neutron induced reactions.