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Improved prediction model for H2/CO combustion risk using a calculated non-adiabatic flame temperature model

Title
Improved prediction model for H2/CO combustion risk using a calculated non-adiabatic flame temperature model
Author
김성중
Keywords
Severe accident; Hydrogen; Carbon monoxide; Combustion; Flammability
Issue Date
2020-12
Publisher
KOREAN NUCLEAR SOC
Citation
NUCLEAR ENGINEERING AND TECHNOLOGY, v. 52, NO 12, Page. 2836-2846
Abstract
During severe nuclear power plant (NPP) accidents, a H2/CO mixture can be generated in the reactor pressure vessel by core degradation and in the containment as well by molten corium-concrete interaction. In spite of its importance, a state-of-the-art methodology predicting H2/CO combustion risk relies predominantly on empirical correlations. It is therefore necessary to develop a proper methodology for flammability evaluation of H2/CO mixtures at ex-vessel phases characterized by three factors: CO concentration, high temperature, and diluents. The developed methodology adopted Le Chatelier’s law and a calculated non-adiabatic flame temperature model. The methodology allows the consideration of the individual effect of the heat transfer characteristics of hydrogen and carbon monoxide on low flammability limit prediction. The accuracy of the developed model was verified using experimental data relevant to ex-vessel phase conditions. With the developed model, the prediction accuracy was improved substantially such that the maximum relative prediction error was approximately 25% while the existing methodology showed a 76% error. The developed methodology is expected to be applicable for flammability evaluation in chemical as well as NPP industries.
URI
https://www.sciencedirect.com/science/article/pii/S1738573320308020?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/175068
ISSN
1738-5733
DOI
10.1016/j.net.2020.07.040
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > NUCLEAR ENGINEERING(원자력공학과) > Articles
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