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Numerical Analysis of the Effect of Hole Size Change in Lower-Support-Structure-Bottom Plate on the Reactor Core-Inlet Flow-Distribution
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 Title & Authors
Numerical Analysis of the Effect of Hole Size Change in Lower-Support-Structure-Bottom Plate on the Reactor Core-Inlet Flow-Distribution
Lee, Gong Hee; Bang, Young Seok; Cheong, Ae Ju;
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 Abstract
In this study, to examine the effect of a hole size change(smaller hole diameter) in the outer region of the lower-support-structure-bottom plate(LSSBP) on the reactor core-inlet flow-distribution, simulations were conducted with the commercial CFD software, ANSYS CFX R.15. The predicted results were compared with those of the original LSSBP. Through these comparisons, it was concluded that a more uniform distribution of the mass flow rate at the core-inlet plane could be obtained by reducing the hole size in the outer region of the LSSBP. Therefore, from the nuclear regulatory perspective, design change of the hole pattern in the outer region of the LSSBP may be desirable in terms of improving both the mechanical integrity of the fuel assembly and the core thermal margin.
 Keywords
Computational Fluid Dynamics;Flow Similarity;Lower Support Structure Bottom Plate;Porous Medium Assumption;Reactor Internal Flow;Turbulent Flow;
 Language
Korean
 Cited by
1.
Numerical Analysis of Flow Distribution Inside a Fuel Assembly with Split-Type Mixing Vanes, Transactions of the Korean Society of Mechanical Engineers B, 2016, 40, 5, 329  crossref(new windwow)
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