This study proposes a layer-to-layer movement model using a once-through fuel cycle strategy to dynamically simulate the on-line refueling process employed in HTR-10. The MCNPX 2.6.0 computer code and continuous energy data library ENDF/B-VII were used in performing all of the computations. In this study, the pebble bed in the core was equally divided into five layers in the axial direction, and the volume fractions of the fuel and graphite pebbles in the initial core were 0.57 and 0.43, respectively. After each fuel cycle, the bottom layer was discharged from the core and discarded while a new layer containing only fuel pebbles was added to the top layer of the core. Hence, the volume fraction of the fuel pebbles increased with greater operation time. This study further proposes that each fuel cycle is stopped to initiate the refueling process for next fuel cycle whenever the effective multiplication factor (keff) reaches approximately 1.005. The results revealed that spikes in the keff versus reactor operation time are the result of burnup and refueling. The fuel cycle tends to approach an equilibrium cycle after refueling five times. In addition, the axial power distribution tends to change from a bottom-peaked to a top-peaked phenomenon as the fuel cycle number increases. In essence, the axial power distribution is nearly un-changed once the reactor core reaches an equilibrium cycle. This phenomenon is also verified by the corresponding axial burnup distribution, average burnup, and mass of special nuclides as a function of operation time.
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2013 21st International Conference on Nuclear Engineering
July 29–August 2, 2013
Chengdu, China
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
978-0-7918-5583-6
PROCEEDINGS PAPER
Burnup Computation for HTR-10 Using Layer-to-Layer Movement Available to Purchase
Shang-Chien Wu,
Shang-Chien Wu
National Tsing Hua University, Hsinchu, Taiwan
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Rong-Jiun Sheu,
Rong-Jiun Sheu
National Tsing Hua University, Hsinchu, Taiwan
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Jinn-Jer Peir,
Jinn-Jer Peir
National Tsing Hua University, Hsinchu, Taiwan
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Jenq-Horng Liang
Jenq-Horng Liang
National Tsing Hua University, Hsinchu, Taiwan
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Shang-Chien Wu
National Tsing Hua University, Hsinchu, Taiwan
Rong-Jiun Sheu
National Tsing Hua University, Hsinchu, Taiwan
Jinn-Jer Peir
National Tsing Hua University, Hsinchu, Taiwan
Jenq-Horng Liang
National Tsing Hua University, Hsinchu, Taiwan
Paper No:
ICONE21-16485, V006T16A045; 5 pages
Published Online:
February 7, 2014
Citation
Wu, S, Sheu, R, Peir, J, & Liang, J. "Burnup Computation for HTR-10 Using Layer-to-Layer Movement." Proceedings of the 2013 21st International Conference on Nuclear Engineering. Volume 6: Beyond Design Basis Events; Student Paper Competition. Chengdu, China. July 29–August 2, 2013. V006T16A045. ASME. https://doi.org/10.1115/ICONE21-16485
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