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For the recovery of tritium and deuterium from the exhaust streams of the International Thermonuclear Experimental Reactor (ITER), it is proposed to use permeators based on Pd alloys. One of these alloys is the Pd-25%Ag. The knowledge of the transport parameters for hydrogen isotopes in these materials is of interest in order to support models for understanding the behaviour of these permeators at various operational scenarios. In the work reported here, experimental values of the transport and inventory parameters (permeability, diffusivity and solubility) for hydrogen and deuterium and the coefficients describing surface reactions, on Pd-25% alloy, have been obtained. Also studied is the permeation of hydrogen isotopes in specimens of Pd-25%Ag homogeneously implanted with helium at 573 K (He concentration: 500 parts per million (ppm) and 1000 appm) to simulate the effect of helium produced by the beta-decay of tritium during steady state operation of the permeator.

Additional information

Authors: SERRA E, JRC Ispra (IT);PERUJO A, JRC Ispra (IT)
Bibliographic Reference: EUR 16454 EN (1996) 30pp., FS
Availability: Available from the Public Relations and Publications Unit, JRC Ispra, I-21020 Ispra (IT), Fax: +39-332-785818
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