Abstract
The acute oxidation behaviors for a number of nuclear graphite grades pertinent to gas-cooled high-temperature reactor (HTR) designs are compared using established American Society for Testing and Materials oxidation testing standards. In the unlikely event of an air-ingress accident, graphite components within the HTR core region are anticipated to oxidize if oxygen is allowed to enter the hot core region. Specimens from six disparate nuclear graphite grades were exposed to air/helium mixtures (100% air and 10% air-in-helium) within and beyond the kinetic oxidation temperature regime to ascertain the oxidation performance for each grade. All specimens were oxidized to a prescribed mass loss within a constant total gas flow of 10 ℓ/min at multiple isothermal temperatures for calculation of oxidation rate and Arrhenius parameters for each graphite grade. A comparison of the oxidation performance among the different grades, as well as the effects resulting from high impurity levels, are discussed.
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