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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.”
J. A. Koch, T. P. Bernat, G. W. Collins, B. A. Hammel, B. J. Kozioziemski, A. J. MacKinnon, J. D. Sater, D. N. Bittner, Y. Lee
Fusion Science and Technology | Volume 38 | Number 1 | July 2000 | Pages 123-131
Technical Paper | Thirteenth Target Fabrication Specialists’ Meeting | doi.org/10.13182/FST00-A36128
Articles are hosted by Taylor and Francis Online.
We have developed a numerical raytrace model, SHELL3D, which simulates the backlit imaging of cryogenic inertial-confinement fusion (ICF) ignition capsules in three dimensions. We have used this model to investigate the limitations of backlit shadowgraphy as a diagnostic of hydrogen ice surface quality inside the capsules. We impose known modal perturbations upon the simulated inner ice surface, and produce simulated shadowgraphs which are then analyzed as if they were real experimental data. We find that power spectra derived from backlit shadowgraphs appear to be reliable indicators of ice surface power spectra out to Fourier mode numbers as high as 80. We also suggest that some advantages may be obtained by using a collimated backlight, and possibly by utilizing backlit transmission interferometry. These results support the conclusion that backlit shadowgraphy is a valid quantitative diagnostic of lower-mode ice surface imperfections inside transparent spherical ICF shells.