During a hypothetical core-disruptive accident in a sodium-cooled FBR, degraded core material can form debris beds on the core-support structure and/or in the lower inlet plenum of the reactor vessel, due to the rapid quenching and fragmentation of the core material melt. Heat convection and vaporization of the sodium will lead ultimately to leveling the debris bed that is of crucial importance to the relocation of the molten core, the recriticality evaluation and the heat removal capability of the debris bed. There is, therefore, a great need for more studies focusing on this topic, especially the much needed numerical simulation. The widely-used fast reactor safety analysis code, SIMMER-III, has difficulties in this simulation because of the lack of modeling for mechanistic interactions among particles in the current version. However, the extensive experimental analysis and the previously-proposed analytical model provide SIMMER-III the possibility of taking consideration of the extra influence of solid particles in this phenomenon. Thus, the debris fluidization model and the boiling regulation model are proposed and introduced into SIMMER-III. Calculations, by the modified SIMMER-III, against several representative experiments with typical self-leveling behavior have been performed and compared with the evaluated items recorded in experiments. The good agreements on these items suggest the modified SIMMER-III can simulate the self-leveling behavior with reasonable precision, especially on the onset of self-leveling, although further model improvement is necessary to represent the transient behavior of bed leveling more reasonably.
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2012 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference
July 30–August 3, 2012
Anaheim, California, USA
Conference Sponsors:
- Nuclear Engineering Division
- Power Division
ISBN:
978-0-7918-4499-1
PROCEEDINGS PAPER
Numerical Simulation of the Self-Leveling Phenomenon by Modified SIMMER-III Available to Purchase
Tatsuya Matsumoto,
Tatsuya Matsumoto
Kyushu University, Fukuoka, Japan
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Koji Morita,
Koji Morita
Kyushu University, Fukuoka, Japan
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Hidemasa Yamano,
Hidemasa Yamano
Japan Atomic Energy Agency, O-arai, Ibaraki, Japan
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Hirotaka Tagami,
Hirotaka Tagami
Japan Atomic Energy Agency, O-arai, Ibaraki, Japan
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Tohru Suzuki,
Tohru Suzuki
Japan Atomic Energy Agency, O-arai, Ibaraki, Japan
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Yoshiharu Tobita
Yoshiharu Tobita
Japan Atomic Energy Agency, O-arai, Ibaraki, Japan
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Bin Zhang
Kyushu University, Fukuoka, Japan
Tatsuya Matsumoto
Kyushu University, Fukuoka, Japan
Koji Morita
Kyushu University, Fukuoka, Japan
Hidemasa Yamano
Japan Atomic Energy Agency, O-arai, Ibaraki, Japan
Hirotaka Tagami
Japan Atomic Energy Agency, O-arai, Ibaraki, Japan
Tohru Suzuki
Japan Atomic Energy Agency, O-arai, Ibaraki, Japan
Yoshiharu Tobita
Japan Atomic Energy Agency, O-arai, Ibaraki, Japan
Paper No:
ICONE20-POWER2012-54684, pp. 751-760; 10 pages
Published Online:
October 30, 2013
Citation
Zhang, B, Matsumoto, T, Morita, K, Yamano, H, Tagami, H, Suzuki, T, & Tobita, Y. "Numerical Simulation of the Self-Leveling Phenomenon by Modified SIMMER-III." Proceedings of the 2012 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference. Volume 5: Fusion Engineering; Student Paper Competition; Design Basis and Beyond Design Basis Events; Simple and Combined Cycles. Anaheim, California, USA. July 30–August 3, 2012. pp. 751-760. ASME. https://doi.org/10.1115/ICONE20-POWER2012-54684
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