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Research Papers: Nuclear Power

Computational Fluid Dynamics Assessment of the Local Hot Core Temperature in a Pebble-Bed Type Very High Temperature Reactor

[+] Author and Article Information
Min-Hwan Kim1

 Korea Atomic Energy Research Institute, 1045 Daedeokdaero, Yoseong, Daejeon, 304-353, Republic of Koreamhkim@kaeri.re.kr

Hong-Sik Lim, Won Jae Lee

 Korea Atomic Energy Research Institute, 1045 Daedeokdaero, Yoseong, Daejeon, 304-353, Republic of Korea

1

Corresponding author.

J. Eng. Gas Turbines Power 131(1), 012905 (Oct 02, 2008) (6 pages) doi:10.1115/1.2983136 History: Received July 21, 2008; Revised July 28, 2008; Published October 02, 2008

Assessment of the local hot core temperature during normal operation in a pebble-bed type very high temperature reactor has been carried out by using the computational fluid dynamic (CFD) method for which the boundary conditions were obtained from the results of a macroscopic analysis of the core using a system thermal analysis code, GAMMA . Three pebble arrangements are selected, which are simple cubic (SC), body-centered cubic, and face-centered cubic. The results showed that the SC arrangement having the lowest porosity gives the highest fuel temperature of 1237°C but still below the normal operational fuel limit of 1250°C. Comparison of the CFD results with an empirical correlation was made for the pressure drop and Nusselt number. Both results showed a similar tendency that the pressure drop and the Nusselt number increases as the porosity decreases but there were large differences in their absolute values. The benchmark calculation for the pressure drop of the packed particles in a square channel indicated that the correlation for the full core used in the system code is not appropriate for the prediction of a local thermal-fluid behavior in an ordered pebble arrangement.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Pebble core model used in the GAMMA analysis

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Figure 2

Computational grid systems

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Figure 3

Computational domain and applied boundary conditions

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Figure 4

Streamline distribution

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Figure 5

Temperature distributions

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Figure 6

Comparison of temperature profiles along the vertical direction of the pebble cross section

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Figure 7

Comparison of temperature profiles along the horizontal direction of the pebble cross section

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Figure 8

Geometry and its surface grid for the pressure drop benchmark

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Figure 9

Simulated streamlines for the turbulent flow (Re=5000)

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Figure 10

Comparison of friction factors between experiments, correlation, and CFD results

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