For the safety design of a Fast Breeder Reactor (FBR), Post Accident Heat Removal (PAHR) is required when a hypothetical Core Disruptive Accident (CDA) occurs. In PAHR, it is strongly required that the molten core material can be solidified and cooled down by the sodium coolant in a reactor vessel. In order to estimate whether the molten material jet is completely solidified by sodium coolant, it is necessary to understand the interaction between the molten core material and the coolant. The objective of the present study is to clarify the dominant factor of the jet breakup length and the size of the fragments experimentally. In this study, we injected molten material (Sn–Bi alloy) into coolant (water) at free fall speed. We can simulate an actual FBR system by using Sn-Bi alloy and water because the density ratio of them is similar to that of an actual FBR system. The jet breakup and the fragmentation behavior of the molten material jet were observed with a high speed video camera. In the previous study which we conducted, solidified crust is generated by the solidification on the molten material jet surface and affects the jet breakup and the fragmentation behavior. Then from the experimental results, in order to predict the size of fragments, it is constructed that the instability model based on hydrodynamic and material mechanics. Then in this paper, the surface close-up of the molten material jet was observed in order to investigate the effect of the solidification on the molten material jet surface.
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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
Influence of the Fragmentation Behavior on Molten Material Jet Breakup in Coolant
Yuzuru Iwasawa,
Yuzuru Iwasawa
University of Tsukuba, Tsukuba, Ibaraki, Japan
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Yutaka Abe,
Yutaka Abe
University of Tsukuba, Tsukuba, Ibaraki, Japan
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Akiko Kaneko,
Akiko Kaneko
University of Tsukuba, Tsukuba, Ibaraki, Japan
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Taihei Kuroda,
Taihei Kuroda
University of Tsukuba, Tsukuba, Ibaraki, Japan
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Eiji Matsuo,
Eiji Matsuo
Mitsubishi FBR Systems, Inc., Tokyo, Japan
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Kenichi Ebihara,
Kenichi Ebihara
Japan Atomic Energy Agency, Tokai, Ibaraki, Japan
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Hiroshi Sakaba,
Hiroshi Sakaba
Mitsubishi Heavy Industries, Ltd., Tokyo, Japan
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Kazuya Koyama,
Kazuya Koyama
Mitsubishi FBR Systems, Inc., Tokyo, Japan
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Kazuhiro Itoh,
Kazuhiro Itoh
University of Hyogo, Himeji, Hyogo, Japan
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Hideki Nariai
Hideki Nariai
University of Tsukuba, Tsukuba, Ibaraki, Japan
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Yuzuru Iwasawa
University of Tsukuba, Tsukuba, Ibaraki, Japan
Yutaka Abe
University of Tsukuba, Tsukuba, Ibaraki, Japan
Akiko Kaneko
University of Tsukuba, Tsukuba, Ibaraki, Japan
Taihei Kuroda
University of Tsukuba, Tsukuba, Ibaraki, Japan
Eiji Matsuo
Mitsubishi FBR Systems, Inc., Tokyo, Japan
Kenichi Ebihara
Japan Atomic Energy Agency, Tokai, Ibaraki, Japan
Hiroshi Sakaba
Mitsubishi Heavy Industries, Ltd., Tokyo, Japan
Kazuya Koyama
Mitsubishi FBR Systems, Inc., Tokyo, Japan
Kazuhiro Itoh
University of Hyogo, Himeji, Hyogo, Japan
Hideki Nariai
University of Tsukuba, Tsukuba, Ibaraki, Japan
Paper No:
ICONE21-15633, V006T15A008; 10 pages
Published Online:
February 7, 2014
Citation
Iwasawa, Y, Abe, Y, Kaneko, A, Kuroda, T, Matsuo, E, Ebihara, K, Sakaba, H, Koyama, K, Itoh, K, & Nariai, H. "Influence of the Fragmentation Behavior on Molten Material Jet Breakup in Coolant." 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. V006T15A008. ASME. https://doi.org/10.1115/ICONE21-15633
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