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Meeting Materials Science & Technology 2019
Symposium Materials for Nuclear Applications
Presentation Title P3-68: Oxidation of TRISO particles and Matrix Graphite in Mixed Gas Atmospheres
Author(s) Elizabeth S. Sooby, Brian Brigham, Katherine Montoya, Marielle Gaspar, Amanda Fernandez, Zachary Acosta, Tyler Gerczak
On-Site Speaker (Planned) Elizabeth S. Sooby
Abstract Scope Under certain accident scenarios, appreciable amounts of O2 and/or H2O can be introduced into the helium coolant of high temperature gas reactors. Thermodynamic assessments of SiC in low partial pressures of steam indicate that at 0.05 atm steam in a temperature range from 800-1600C the pO2 in steam is sufficient to observe both passive and active oxidation. Additionally, at 0.10 atm steam, the pO2 is sufficient to observe an active to carbon forming oxidation transition occurring at ~1300°C. Expected matrix burnoff further complicates the reaction chemistry predicted under such a scenario. This effect has been experimentally simulated in a thermogravimetric analyzer and the ratios of volatile reactions quantified utilizing a quadrupole mass spectrometer. Presented will be thermogravimetric, mass spec., and SiC microstructural behavior under these atmospheres, alongside equilibrium condition simulations and a novel computational approach to predict oxidation behavior under mixed gas atmospheres.


A Metallic Multilayer Composite for use in Fluoride Molten Salt Reactors
Aging Behavior and Microstructure Evolution in Ni-Cr-Mo-W (Haynes 244) Alloy After Surface Treatment by Laser Shock Peening (LSP)
Anisotropic Thermal Transport in Uranium Dioxide Induced by Dislocation
Anisotropy in Thermal Creep and Creep Life Prediction of Zr-2.5%Nb Pressure Tube Alloy
Characterization of the Impact of Fission Product Inclusion on Phase Development in U3Si2 Fuel
Combined Use of In-situ and Ex-situ TEM to Characterize Irradiation Induced Dislocation Loops in F/M Steels for Nuclear Applications
Comparison of In-situ Micro- and Ex-situ Meso-scale Tensile Testing for the Evaluation of Mechanical Properties of Stainless Steels
Compatibility of U3Si2 fuel with FeCrAl and SiC/SiC Based Cladding
Computational Studies of Environmental Degradation of Silicon Carbide
Design of Alloy Chemistry to Mitigate Fuel-Cladding Chemical Interactions in Uranium-based Metallic Fuels
Development and Performance of High Temperature Irradiation Resistant Thermocouples
Effect of Ultrasonic Nanocrystalline Surface Modification (UNSM) on the Oxidation Behavior of Alloy 800HT in a Supercritical Carbon Dioxide (SCO2) Environment
Effects of Ti and Al Additions on Irradiation Behavior of FeMnNiCr Based High-Entropy Alloys
Enhancing the Properties of a Cast FeNiMnCr10 Co-free High-entropy Alloy Through Hot Rolling
Evolution of Microstructure, Deformation Mechanisms, and Internal Damage During Creep-Fatigue Testing of Alloy 709 (Fe-20Cr-25Ni)
Exploring TRISO Layer Properties and Performance for Multiple Reactor Concepts
High-Entropy Carbide Ceramics for Extreme Environments
In-situ Characterization of Zirconium Alloy Degradation to Support Nuclear Sensing Applications
In-situ Ion Irradiation Study of Silicon Carbide-Carbon Coated Nanostructured Ferritic Alloy
Materials for Capture of Uranium for Nuclear Fuel from Fertilizer
Multi-dimensional, In-situ Mechanical Testing to Evaluate Damage and Fracture of Chromium-Coated Zirconium-based Fuel Claddings
P3-62: Characterization and Oxidation of Graphite and Silicon Carbide in TRISO Nuclear Fuel
P3-63: Corrosion Behavior of Metallic Alloys in a Molten Chloride Eutectic Salt for Nuclear Applications
P3-64: Corrosion Behavior of Nanostructured Stainless Steels and High Entropy Alloys
P3-65: Effects of Deposition Conditions on the Production of ZrO2 Coatings Produced by PE-CVD as Environmental Barrier Coatings for the Molten Salt Reactor
P3-67: Investigation of Recrystallization and Grain Growth in Uranium 10 wt% Molybdenum
P3-68: Oxidation of TRISO particles and Matrix Graphite in Mixed Gas Atmospheres
Predicting Concrete’s Response to Irradiation
PVD Coating of Surrogate Fuels for Deep Space Nuclear Thermal Propulsion
Rapid Multiscale Simulation of Cladding Performance: Application to HT-9
Spectral Thermal Conductivity Predictions in UO2 with Xe Inclusions
Steam Oxidation and Microstructural Characterization of U3Si2 alloyed with Al, Cr, Nb, Y, and Zr
Temperature Impacts on Damage Response in Mixed Carbides
The Effects of Ultrasonic Nanocrystal Surface Modification at Room Temperature and Elevated Temperatures on Residual Stress, Microstructure and Mechanical Properties of Nuclear Alloys IN600 and IN690.
Thermophysical Properties of Binary Cl & F Compositions for Next Generation Molten Salt Reactors
Transmutation-induced Precipitation in Tungsten Irradiated with a Mixed Energy Neutron Spectrum
Unveiling SiC/SiC CMC Cladding Failure Mechanisms and Hermetic Performance with In-situ 3D-Digital Image Correlation
Uranium Nitride and High Temperature Irradiation Resistant Thermocouples towards Accident Tolerant Nuclear Fuel
Using ACRT with MVB Furnace to Achieve Low-cost CZT

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