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BET surface area measurements of materials for fusion safety studies

The reaction of air or steam with plasma facing materials and tokamak dust is a concern during an accident involving a breach in the vacuum plasma chamber of a fusion reactor. Hydrogen generated from steam reactions must be maintained below explosive concentrations. An important parameter influencing reaction rates is the specific surface area (SSA) of a material. We present the capabilities and background that we have obtained using the BET gas adsorption method on various fusion relevant materials. BET data are useful in developing correlations with steam reaction rates and characterizing irradiated beryllium and dust collected from tokamaks.