Volatility from copper and tungsten alloys for fusion reactor applications

Accident scenarios for fusion power plants present the potential for release and transport of activated constituents volatized from first-wall and structural materials. The extent of possible mobilization and transport of these activated species (many of which are oxidation driven) is being addressed by the Fusion Safety Program at the Idaho National Engineering Laboratory (INEL). Experimental measurements of volatilization from a copper alloy in air and steam and from a tungsten alloy in air are presented. The major elements released included zinc from the copper alloy and rhenium and tungsten from the tungsten alloy. Volatilization rates of several constituents of these alloys over temperatures ranging from 400 to 1200 are presented. These release rates are recommended for use in accident assessment calculations