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An accurate and particular description of isotope effects in hydrogen transport within structural martensitic steels is highly needed in nuclear fusion technology in order to describe the tritium-material interaction on the basis of the properties of the non-radioactive hydrogen isotopes (protium and deuterium). As a result, tritium transport investigation becomes technologically more feasible because a cost-effective radioactive device is not mandatory. Additionally, a precise isotopic description allows differentiating the behaviour of the fuel-components deuterium and tritium within the blanket structures in reactor operation conditions. A time-dependent gas-phase isovolumetric desorption technique has been used to evaluate the isotopic effects in the diffusive transport parameters of hydrogen in an 8% CrWVTa reduced activation martensitic steel in the temperatures range 423 to 892 K and driving pressures from 4.10(E4) to 1.10(E5) Pa. Experiments have been run with both protium and deuterium obtaining their respective transport parameters: diffusivity (D), Sieverts' constant (Ks), permeability (Theta), the trap density (Eta.t) and the trapping activation energy (Et).

Additional information

Authors: ESTEBAN G A, UPV-EHU, ETSILT, Bilbao (ES);LEGARDA F, UPV-EHU, ETSILT, Bilbao (ES);PERUJO A, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra (IT);SEDANO L A, CIEMAT, Madrid (ES)
Bibliographic Reference: An oral report given at: 6th International Conference on Tritium Science and Technology. Held at: Tsukuba, Ibaraki (JP), 11-16 November 2001
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