La. Sedano et al., LIBRETTO-3 - MODELING TRITIUM EXTRACTION PERMEATION AND EVALUATION OFPERMEATION BARRIERS UNDER IRRADIATION/, Journal of nuclear materials, 237, 1996, pp. 1411-1415
Citations number
14
Categorie Soggetti
Nuclear Sciences & Tecnology","Mining & Mineral Processing","Material Science
Permeation barriers are required in order to limit the size and cost o
f the detritiation plants for future fusion reactor blankets of the wa
ter-cooled Pb-17Li type. The LIBRETTO irradiations were performed to e
valuate the efficiency of permeation barriers under high flux reactor
(HFR) conditions. Tritium extraction and permeation characteristics fr
om Pb-17Li under variable temperatures 553-723 K, H-2 doping (0-1 vol%
) and purge gas flow rates 20-100 sec/min were tested in LIBRETTO-3. A
n external TIC coating, an internal (TiC + Al2O3), both produced by ch
emical vapour deposition (CVD), and an internal Al2O3 produced by pack
cementation (PC) on AISI 316L steel were tested as permeation barrier
s. The release mechanisms, experimental uncertainties and method for p
ermeation barriers qualification are presented. As a result permeation
reduction factors (PRF) at 0.1 dpa of 17 and 34 were obtained for the
CVD-Al2O3 at 498 K and for the PC-Al2O3 at 508 K, respectively. These
values were confirmed by a residence time analysis and are higher tha
n in a preliminary analysis [1].