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Deuterium trapping and release processes occuring in γ-irradiated solid breeder blanket materials

Carella, E.; Saavedra, R.; Morono, A.; Knitter, R.; Gonzalez, M.

Abstract:
Tritium (T) behavior in a breeder blanket is a key design issue because of its impact on safety and fuel-cycle best performance. Considering the difficulty in handling T, the validation of an alternative method is an issue. In an attempt to simulate T residence time (or T diffusion) in a DEMO-like ionizing environment, gas sorption-desorption experiments of deuterium (D) during ionizing radiation in breeder ceramics were carried out to elucidate the involved D2 or T trapping centers. A deconvolution method is here proposed for the identification of the release processes occurring at the different temperatures, therefore providing the basic information for identifying the nature of they-associated defects acting as D or T-trapping centers. The deuterium release in the EU-BB solid candidate material is studied in Li4 Si04 ceramics with variable LizTi03 content (pebble samples fabricated by KIT). The samples, previously dehydrated, are exposed to a deuterium atmosphere inside a pressurized steel capsule (I bar) during 25 days and immersed in the 6°Co Nayade facility located at CIEMAT. Deuterium desorption curves are then registered by ... mehr


Zugehörige Institution(en) am KIT Fakultät für Maschinenbau (MACH)
Institut für Angewandte Materialien - Keramische Werkstoffe und Technologien (IAM-KWT)
Publikationstyp Vortrag
Jahr 2015
Sprache Englisch
Identifikator KITopen ID: 230102811
HGF-Programm 31.03.06; LK 01
Erschienen in 17th International Conference on Fusion Reactor Materials, Aachen, October 12- 16, 2015
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