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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. A. Frederick, R. R. Paguio, A. Nikroo, J. H. Hund, O. Acennas, M. Thi
Fusion Science and Technology | Volume 49 | Number 4 | May 2006 | Pages 657-662
Technical Paper | Target Fabrication | doi.org/10.13182/FST06-A1182
Articles are hosted by Taylor and Francis Online.
Resorcinol Formaldehyde (R/F) foam has been used in the fabrication of direct drive shell targets for Inertial Fusion Confinement (ICF) experiments at the University of Rochester's Laboratory for Laser Energetics (LLE). Recent cryogenic experiments at LLE using R/F shells have shown the necessity of larger pore foam compared to the standard R/F formulation. In this paper, we report controlling the pore size of R/F foam with concomitant control of the gelation time, which is crucial for successful shell fabrication. The "standard" formulation, with pores of <100 nm, was modified by decreasing the base catalyst to resorcinol concentration ratio creating a large pore R/F foam (~ >0.5 m) through reaction limited aggregation. However, this formulation decreased the gelation time, which decreased the yield of shells with proper wall uniformity (~ 30%) to an unacceptable level of <1%. We developed a technique to achieve control over the gelation time, while keeping the large pore characteristics of R/F to improve shell non-uniformity and increasing the yield to an acceptable level. We also developed a new technique for large pore formation involving changes to the acid catalyst concentration. The effects of this new formulation on the wall uniformity of shells are discussed. The pore distributions obtained using these new R/F foams were characterized using a variety of techniques, including electron microscopy, nitrogen gas adsorption, visible spectroscopy, and small angle x-ray scattering and compared to the standard small pore formulation.