Studies on local fuel-coolant interactions (FCI) in a molten pool are important for severe accident analyses of sodium-cooled fast reactors (SFRs). To clarify the mechanisms underlying this interaction, in this study a series of experiments was conducted by delivering a given quantity of water into a simulated molten fuel pool (formed with a low-melting-point alloy). Based on the experimental data obtained from a variety of conditions, including difference in water volume, melt temperature and water subcooling, the characteristics of pressure-buildup during local FCIs was investigated. It is found that under our experimental conditions the water volume and melt temperature have remarkable impact on the interaction, while the role of water subcooling seems to be less prominent. The performed analyses also suggest that the pressurization from local FCIs should be intrinsically limited, due to a suppressing role caused by the increasing of coolant volume entrapped within the pool as well as the transition of boiling mode. Current work, which gives a palette of favorable data for a better understanding and an improved estimation of severe accidents in SFRs, is expected to benefit future analyses and verifications of computer models developed in advanced fast reactor safety analysis codes.
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2014 22nd International Conference on Nuclear Engineering
July 7–11, 2014
Prague, Czech Republic
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
978-0-7918-4591-2
PROCEEDINGS PAPER
Characteristics of Pressure Buildup From Local Fuel-Coolant Interactions in a Simulated Molten Fuel Pool
Songbai Cheng,
Songbai Cheng
Japan Atomic Energy Agency, Oarai, Ibaraki, Japan
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Ken-ichi Matsuba,
Ken-ichi Matsuba
Japan Atomic Energy Agency, Oarai, Ibaraki, Japan
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Mikio Isozaki,
Mikio Isozaki
Japan Atomic Energy Agency, Oarai, Ibaraki, Japan
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Kenji Kamiyama,
Kenji Kamiyama
Japan Atomic Energy Agency, Oarai, Ibaraki, Japan
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Tohru Suzuki,
Tohru Suzuki
Japan Atomic Energy Agency, Oarai, Ibaraki, Japan
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Yoshiharu Tobita
Yoshiharu Tobita
Japan Atomic Energy Agency, Oarai, Ibaraki, Japan
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Songbai Cheng
Japan Atomic Energy Agency, Oarai, Ibaraki, Japan
Ken-ichi Matsuba
Japan Atomic Energy Agency, Oarai, Ibaraki, Japan
Mikio Isozaki
Japan Atomic Energy Agency, Oarai, Ibaraki, Japan
Kenji Kamiyama
Japan Atomic Energy Agency, Oarai, Ibaraki, Japan
Tohru Suzuki
Japan Atomic Energy Agency, Oarai, Ibaraki, Japan
Yoshiharu Tobita
Japan Atomic Energy Agency, Oarai, Ibaraki, Japan
Paper No:
ICONE22-31221, V02BT09A059; 7 pages
Published Online:
November 17, 2014
Citation
Cheng, S, Matsuba, K, Isozaki, M, Kamiyama, K, Suzuki, T, & Tobita, Y. "Characteristics of Pressure Buildup From Local Fuel-Coolant Interactions in a Simulated Molten Fuel Pool." Proceedings of the 2014 22nd International Conference on Nuclear Engineering. Volume 2B: Thermal Hydraulics. Prague, Czech Republic. July 7–11, 2014. V02BT09A059. ASME. https://doi.org/10.1115/ICONE22-31221
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