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Division Spotlight
Operations & Power
Members focus on the dissemination of knowledge and information in the area of power reactors with particular application to the production of electric power and process heat. The division sponsors meetings on the coverage of applied nuclear science and engineering as related to power plants, non-power reactors, and other nuclear facilities. It encourages and assists with the dissemination of knowledge pertinent to the safe and efficient operation of nuclear facilities through professional staff development, information exchange, and supporting the generation of viable solutions to current issues.
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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Nuclear Science and Engineering
August 2024
Nuclear Technology
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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.”
Xiang Zhang, Daogui Tian, Yanfang Xue, Lian Chen, Yuquan Li (SNPTC)
Proceedings | Advances in Thermal Hydraulics 2018 | Orlando, FL, November 11-15, 2018 | Pages 1215-1233
In the present study, a two phase transient three-dimensional CFD simulation is carried out to numerically investigate the saturated downward facing pool boiling on a hemispherical heating surface. This simulation is performed within the OpenFOAM framework and a two phase Euler-Euler approach (Volume of Fluid (VOF) model) has been chosen in this research. This code can be used to predict the distribution of the local flow parameters, such as the void fraction, bubble diameter, the velocity of both liquid and gas, the turbulent intensity as well as liquid temperature. Special attention has been devoted to the two phase flow characteristics and vapor morphology along the overheated hemispherical curved surface. For the validation of boiling phenomena, the results of CFD simulation are compared with the visualizations of subscale boundary layer boiling experiment conducted by State Nuclear Power Technology Research & Development Center (SNPTRD) in China. Simulation results show that vapor behavior along the hemispherical curved surface is cyclical, repeatedly forming a stratified vapor layer at the bottom center, which stretches as more vapor is generated, and then flows upwards along from the convex surface. These numerical results show good agreements with the experimental data. Moreover, detailed analysis focusing on the pressure, velocity, void fraction, heating wall temperature as well as the two phase natural circulation flow characteristics are proposed in this paper. It is found that the vapor behavior of downward facing pool boiling on a hemispherical surface is quite different from those on other surface orientations in many respects including the bubble shape, velocity, rise distance and moving trajectory.