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http://dx.doi.org/10.3795/KSME-B.2014.38.3.271

Numerical Study on the Effect of Reactor Internal Structure Geometry Treatment Method on the Prediction Accuracy for Scale-down APR+ Flow Distribution  

Lee, Gong Hee (Safety Evaluation Department, Korea Institute of Nuclear Safety)
Bang, Young Seok (Safety Evaluation Department, Korea Institute of Nuclear Safety)
Woo, Sweng Woong (Safety Evaluation Department, Korea Institute of Nuclear Safety)
Cheong, Ae Ju (Nuclear Safety Research Department, Korea Institute of Nuclear Safety)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.38, no.3, 2014 , pp. 271-277 More about this Journal
Abstract
Internal structures, especially those located in the upstream of a reactor core, may have a significant influence on the core inlet flow rate distribution depending on both their shapes and the relative distance between the internal structures and the core inlet. In this study, to examine the effect of the reactor internal structure geometry treatment method on the prediction accuracy for the scale-down APR+ flow distribution, simulations with real geometry modeling were conducted using ANSYS CFX R.14, a commercial computational fluid dynamics software, and the predicted results were compared with those of the porous medium assumption. It was concluded that the core inlet flow distribution could be predicted more accurately by considering the real geometry of the internal structures located in the upstream of the core inlet. Therefore, if sufficient computational resources are available, an exact representation of these internal structures, for example, lower support structure bottom plate and ICI nozzle support plate, is needed for the accurate simulation of the reactor internal flow.
Keywords
Computational Fluid Dynamics; Flow Similarity; Geometry Modeling; Porous Medium Assumption; Reactor Internal Flow; Turbulent Flow;
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Times Cited By KSCI : 3  (Citation Analysis)
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