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Kinetic modeling of IG-110 oxidation in inert atmosphere with low oxygen concentration for innovative high-temperature gas-cooled reactor applications.
- Source :
- Journal of Nuclear Science & Technology; Jun2024, Vol. 61 Issue 6, p802-809, 8p
- Publication Year :
- 2024
-
Abstract
- The oxidation behavior of IG-110, a graphite core component, was investigated at temperatures ranging from 400 to 1000°C in a 10 ppm Ar/O<subscript>2</subscript> flow to simulate the oxidation process between the graphite core component and helium coolant with low O<subscript>2</subscript> concentrations employed in advanced High-Temperature Gas-cooled Reactors (HTGRs). The results reveal that IG-110 undergoes significant mass loss at temperatures above 700°C, resulting in total mass changes of −1.5%, −5.3%, and −9.0% at 700, 800, and 1000°C, respectively, during a 10-hour oxidation period. No significant mass loss is observed below 600°C. To understand the oxidation mechanism of IG-110 under low O<subscript>2</subscript> concentrations, we propose a kinetic model as the current chemical kinetic-controlled model does not fully explain the oxidation behavior observed in our research. Our analysis shows lower estimated reaction rates compared to studies at higher O<subscript>2</subscript> concentrations; the activation energy values exhibit good agreement. The proposed kinetic model sheds light on the oxidation mechanism of IG-110 under 10 ppm Ar/O<subscript>2</subscript> flow. This study provides new insights into the oxidation behavior of graphite core components in HTGRs and highlights the importance of controlling the O<subscript>2</subscript> concentration in the helium coolant to prevent severe degradation of SiC-matrix fuel compacts. [ABSTRACT FROM AUTHOR]
- Subjects :
- OXIDATION
CHEMICAL kinetics
GAS cooled reactors
HELIUM
ACTIVATION energy
Subjects
Details
- Language :
- English
- ISSN :
- 00223131
- Volume :
- 61
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Journal of Nuclear Science & Technology
- Publication Type :
- Academic Journal
- Accession number :
- 177319221
- Full Text :
- https://doi.org/10.1080/00223131.2023.2274928