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Division Spotlight
Reactor Physics
The division's objectives are to promote the advancement of knowledge and understanding of the fundamental physical phenomena characterizing nuclear reactors and other nuclear systems. The division encourages research and disseminates information through meetings and publications. Areas of technical interest include nuclear data, particle interactions and transport, reactor and nuclear systems analysis, methods, design, validation and operating experience and standards. The Wigner Award heads the awards program.
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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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.”
Kwon-Yeong Lee, Moo Hwan Kim
Nuclear Technology | Volume 163 | Number 2 | August 2008 | Pages 261-272
Technical Paper | Thermal Hydraulics | doi.org/10.13182/NT08-A3986
Articles are hosted by Taylor and Francis Online.
A theoretical model using a heat and mass transfer analogy was developed to investigate the effects of noncondensable gases on the heat transfer coefficient of steam condensing inside a vertical tube. The Nusselt and Sherwood numbers in the gas phase were modified to incorporate the effects of condensate film roughness, suction, and developing flow. The model predictions showed good agreement with the experimental data obtained for various experimental conditions. A parametric study was conducted using the model with condenser tube diameter as a variable. The results indicated that the effects of noncondensable gases become weak as the inlet mixture Reynolds number (Remix,in = 4[over dot]mmix,in/dimix,in) increases and inlet noncondensable gas mass fraction (Wnc,in = [over dot]mnc,in/([over dot]mnc,in + [over dot]mv,in)) decreases. In addition, the effects of noncondensable gases also become weak as the condenser tube diameter decreases with the same inlet mixture Reynolds number because of interfacial shear stress.