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Nuclear Criticality Safety
NCSD provides communication among nuclear criticality safety professionals through the development of standards, the evolution of training methods and materials, the presentation of technical data and procedures, and the creation of specialty publications. In these ways, the division furthers the exchange of technical information on nuclear criticality safety with the ultimate goal of promoting the safe handling of fissionable materials outside reactors.
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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.”
Charles A. Riggs, Robert V. Tompson, Tushar K. Ghosh, Sudarshan K. Loyalka, Dabir S. Viswanath
Nuclear Technology | Volume 157 | Number 1 | January 2007 | Pages 74-86
Technical Paper | Nuclear Plant Operations and Control | doi.org/10.13182/NT07-A3803
Articles are hosted by Taylor and Francis Online.
Adsorption isotherms for water vapor on powdered cesium iodide are reported. Both macroscopic and microscopic (single-particle) samples of CsI powder from the same source were studied by two different techniques. The adsorption isotherms for the macroscopic samples were obtained using a Cahn 2000 Electrobalance, which leaves the sample uncharged during the measurement and utilizes a conventional microbalance to measure the relevant mass changes. The adsorption isotherms for the microscopic samples were obtained using a custom-made two-ring electrodynamic balance to measure the mass changes due to adsorption that occurred for single suspended charged particles of the CsI powder. Here, the relevant mass changes were determined from the changes observed in the required particle suspension voltages in the balance. The total charge on each particle studied was determined using the electron stepping technique. Based on the classification scheme of Brunauer, Emmett, and Teller, it is concluded that type III adsorption isotherms were observed for both the macroscopic and the single-particle CsI samples, which would indicate a multilayer adsorption process. The isotherms for the macroscopic and the single-particle CsI samples, while exhibiting the same basic shape, were found to vary greatly in magnitude. It is believed that this variation in magnitude is primarily due to the charge on the microscopic samples interacting attractively with the highly polarized water molecules and thus significantly increasing the multilayer adsorption of water. Some possible chemisorption was also indicated for both the charged and uncharged CsI, as evidenced by an inability to completely regenerate either the macroscopic or the microscopic samples.