In the reactor core of a pebble bed HTGR, fuel pebbles are in random arrangement. The coolant flow passages are complicated. Under the air and water ingress accident conditions, the partially enriched oxidizing gas corrodes the fuel pebbles by oxidation reaction. How the oxidizing gases (oxygen and water vapor) diffuse in the pebble bed will greatly influence the oxidation process. Analysis of the mass mixing is important for analyzing the fuel element graphite corrosion and safety of HTGR. In this paper, a three-dimensional simple cubic structure packed cells of pebble bed core model with surface contact method was established. The flow, and mass mixing processes were numerically and theoretically studied using numerical simulation and porous media methods. The effects of molecular diffusion, turbulent diffusion and mass dispersion on mass mixing effect were discussed respectively.
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2018 26th International Conference on Nuclear Engineering
July 22–26, 2018
London, England
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
978-0-7918-5152-4
PROCEEDINGS PAPER
Numerical Investigation of Mass Mixing in the Reactor Core of a Pebble Bed HTGR Available to Purchase
Xiaowei Li,
Xiaowei Li
Tsinghua University, Beijing, China
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Xinxin Wu
Xinxin Wu
Tsinghua University, Beijing, China
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Wei Lu
Tsinghua University, Beijing, China
Xiaowei Li
Tsinghua University, Beijing, China
Xinxin Wu
Tsinghua University, Beijing, China
Paper No:
ICONE26-81722, V008T09A022; 6 pages
Published Online:
October 24, 2018
Citation
Lu, W, Li, X, & Wu, X. "Numerical Investigation of Mass Mixing in the Reactor Core of a Pebble Bed HTGR." Proceedings of the 2018 26th International Conference on Nuclear Engineering. Volume 8: Computational Fluid Dynamics (CFD); Nuclear Education and Public Acceptance. London, England. July 22–26, 2018. V008T09A022. ASME. https://doi.org/10.1115/ICONE26-81722
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