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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.
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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 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. 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.”
Zhi-Gang Zhang, Ken-Ichiro Sugiyama
Nuclear Technology | Volume 175 | Number 3 | September 2011 | Pages 619-627
Technical Paper | NURETH-13 Special / Thermal Hydraulics | doi.org/10.13182/NT11-A12510
Articles are hosted by Taylor and Francis Online.
To characterize the relationship between hydrodynamic and thermal effects on fragmentation of molten core structural material, which mainly includes cladding material, with the interaction of the coolant of sodium under a wide range of thermal and hydrodynamic conditions, this paper focuses on a series of fragmentation characteristics of a single molten Type 304 stainless steel droplet (5 g) with an ambient Weber number Wea from 199 to 586 and superheat conditions from 23 to 276°C, which penetrates into a sodium pool at an initial temperature from 301 to 313°C.In our experiments, fine fragmentations of single molten stainless steel droplets with high Wea were clearly observed, even under a supercooled condition that is well below its melting point of 1427°C. The dimensionless mass median diameters (Dm/D0) of molten droplets with high Wea are less than molten droplets with low Wea under the same thermal condition. When Wea is approximately >250, the hydrodynamic effect on fragmentation becomes predominant over the thermal effect under a relatively low superheat condition. For a higher Wea range, the comparisons indicate that the fragment sizes of the molten stainless steel droplet and jet have similar distributions to those of molten metallic fuel jets even with different thermophysical properties and a thousandfold mass difference, which implies the possibility that the fragment size characteristics of molten metal jets could be evaluated by the interaction of a single droplet with the sodium coolant without the consideration of dropping modes and mass.