After the Fukushima Daiichi accident, predicting lower flammability limits (LFL) as a part of hydrogen risk analysis has become an ever important task. Although many experimental studies have been conducted extensively, the LFL results for mixtures abided by the severe accident conditions are still lacking. The objective of this study is to develop a calculated non-adiabatic flame temperature (CNFT) model, which facilitates to predict the LFL of hydrogen mixtures. This model considers heat loss due to radiative heat transfer from flame to ambient environment during flame propagation. The model shows better agreement with experimental results for various mixtures than previous model, which predicts the LFL through a calculated adiabatic flame temperature. Especially, prediction accuracy for H2-air-steam mixture and mixtures at elevated initial temperature is improved substantially. Thus it is worth to evaluate the applicability of the CNFT model in the hydrogen risk analysis during severe accident. The postulated hydrogen risk in the current Optimized Power Reactor 1000 MWe (OPR1000) under Station Blackout (SBO) scenario was investigated with MELCOR 1.8.6 code. As a result, it was observed that uncertainty of hydrogen risk calculated with the MELCOR default model can be reduced by the CNFT model. This study suggests that the developed CNFT model can enhance reliability of severe accident analysis related to the flammability of hydrogen mixtures.
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2018 26th International Conference on Nuclear Engineering
July 22–26, 2018
London, England
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
978-0-7918-5153-1
PROCEEDINGS PAPER
Investigation of Flammability of Hydrogen Gases With Diluent Gases Under Severe Accident Conditions Using CNFT Model Available to Purchase
Joongoo Jeon,
Joongoo Jeon
Hanyang University, Seoul, Korea
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Nam Kyung Kim,
Nam Kyung Kim
Hanyang University, Seoul, Korea
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Sung Joong Kim
Sung Joong Kim
Hanyang University, Seoul, Korea
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Joongoo Jeon
Hanyang University, Seoul, Korea
Nam Kyung Kim
Hanyang University, Seoul, Korea
Wonjun Choi
Hanyang University, Seoul, Korea
Taeseok Kim
Hanyang University, Seoul, Korea
Sung Joong Kim
Hanyang University, Seoul, Korea
Paper No:
ICONE26-81773, V009T16A052; 9 pages
Published Online:
October 24, 2018
Citation
Jeon, J, Kim, NK, Choi, W, Kim, T, & Kim, SJ. "Investigation of Flammability of Hydrogen Gases With Diluent Gases Under Severe Accident Conditions Using CNFT Model." Proceedings of the 2018 26th International Conference on Nuclear Engineering. Volume 9: Student Paper Competition. London, England. July 22–26, 2018. V009T16A052. ASME. https://doi.org/10.1115/ICONE26-81773
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