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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
2024 ANS Annual Conference
June 16–19, 2024
Las Vegas, NV|Mandalay Bay Resort and Casino
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
Can hydrogen be the transportation fuel in an otherwise nuclear economy?
Let’s face it: The global economy should be powered primarily by nuclear power. And it probably will by the end of this century, with a still-significant assist from renewables and hydro. Once nuclear systems are dominant, the costs come down to where gas is now; and when carbon emissions are reduced to a small portion of their present state, it will become obvious that most other sources are only good in niche settings. I mean, why use small modular reactors to load-follow when they can just produce that power instead of buffering it?
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.