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As part of a study of the thermodynamics, kinetics and embrittlement properties of hydrogen in vanadium based alloys, experiments were conducted to determine the rate of hydrogen transport through the vanadium reference alloys, V-7.5Cr-15Ti and V-4Cr-4Ti, and to determine these alloys' hydrogen embrittlement, they were exposed to hydrogen pressures of 3 and 300 kPa (0.03-3 atm) at temperatures between 380 and 475°C. To facilitate hydrogen entry and egress, tubes of these alloys were coated with palladium on the inside and outside faces. Observed permeabilities were 0.015 to 0.065 pmoles/(m2sPao*5) for the V-7.5Cr-15Ti alloy and 0.02 to 0.05 pmoles/m2sPaO.5 for the V-4Cr-4Ti alloy depending on the quality of the coat and the operating temperature. At 1.7 am hydrogen, V-7.5Cr-lSTi embrittled at temperatures below 380' C while V-4Cr4Ti embrittled around 330O C

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