Gas- and plasma-driven hydrogen permeation through a reduced activation ferritic steel alloy F82H

The first wall of a magnetic fusion power reactor will be subjected to hydrogen isotope permeation by the two mechanisms: one is gas-driven and the other is plasma-driven. Hydrogen transport through a reduced activation ferritic steel alloy F82H has been investigated using a steady-state laboratory-...

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Veröffentlicht in:Journal of nuclear materials 2014-12, Vol.455 (1-3), p.470-474
Hauptverfasser: Zhou, Haishan, Hirooka, Yoshi, Ashikawa, Naoko, Muroga, Takeo, Sagara, Akio
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Sprache:eng
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Zusammenfassung:The first wall of a magnetic fusion power reactor will be subjected to hydrogen isotope permeation by the two mechanisms: one is gas-driven and the other is plasma-driven. Hydrogen transport through a reduced activation ferritic steel alloy F82H has been investigated using a steady-state laboratory-scale plasma device. Permeation parameters including permeability, solubility and diffusivity have been measured in the temperature range from 150 to 520 [degrees]C. The surface recombination coefficient for hydrogen has also been estimated by a one-dimensional steady-state permeation model with the input data taken from experiments. Using these parameters, the hydrogen plasma-driven permeation flux and inventory for a 0.5 cm thick first wall around 500 [degrees]C are estimated to be ~1.0 x 10 super(13) atom cm super(-2) s super(-1) and ~2 x 10 super(16)-atom cm super(~3), respectively. Also, the implications of all these data on reactor operation are discussed.
ISSN:0022-3115
DOI:10.1016/j.jnucmat.2014.07.061