München 2019 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 18: Postersitzung

P 18.79: Poster

Donnerstag, 21. März 2019, 16:30–18:30, Foyer Audimax

Investigation of deuterium retention and permeation in ITER 316L(N)-IG stainless steel — •Jana Scheuer, Anne Houben, Arkadi Kreter, Marcin Rasinski, Yulia Martynova, Bernhard Unterberg, and Christian Linsmeier — Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung - Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), 52425 Jülich, Germany

Austenitic steel type 316L(N) is installed in ITER. In terms of safety and to avoid fuel losses, it is important to study deuterium retention and permeation in 316L(N)-IG steel. The samples are polished and annealed to eliminate surface effects and influences of natural hydrogen inventory. Subsequently, a deuterium plasma exposure takes place in the linear plasma device PSI-2. In order to determine the influence of deuterium exposure on the permeation of deuterium through the material the samples are investigated in a permeation measurement system. The retained deuterium inventory can be observed by thermal desorption spectroscopy (TDS). To examine the influence of deuterium exposure, the samples are loaded with plasma or unloaded. The surface structure is determined before and after plasma loading by a Scanning Electron Microscope (SEM). Furthermore, SEM measurements on cross sections prepared by an focused ion beam (FIB) are performed to investigate the influence of the change of the surface and microstructure by deuterium exposure. The deuterium inventory and the change of deuterium permeation through the material during ITER operation can be estimated.