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Modeling and analysis of time-dependent tritium transport in lithium oxide

Summary: Modeling and analysis of time-dependent tritium transport in
lithium oxide
A. Badawi, A.R. Raray *, M.A. Abdou
Fusion Technology Group, 43-133 Engineering IV, Department of Mechanical and Aerospace Engineering, University of California,
Los Angeles, P.O. Box 951597, Los Angeles, CA 90095-1597, USA
Received 14 July 1993; accepted 17 December 1998
Tritium behavior in the solid breeder blanket is one of the key factors in determining tritium self-suciency, as well
as safety, of fusion reactors. Therefore, it is important to understand the tritium transport mechanisms and processes, in
order to accurately determine the tritium release and inventory in the blanket. A model has been developed at UCLA to
describe the tritium behavior in solid breeder materials, together with a computer code which can predict the tritium
release and inventory. However, the model was limited in some cases: for example, it did not include the capability to
account for surface to bulk ¯uxes and for trapping inside the grain which can have major eects on the tritium
transport. The model capabilities have been extended to enable its application over a wide range of experimental
conditions. Improvements include: (1) implementing an initial model to account for the general eect of trapping in the
bulk, (2) addition of a dissolution ¯ux which would enable a more accurate modeling of solubility driven by hydrogen
partial pressure in the solid breeder porosity, (3) inclusion of more hydrogen isotopes species in the pore, and, (4)
modi®cation of the existing computer code to allow for broader application, such as the possibility of accounting for
both ®rst order and second order adsorption/desorption. The code was used to analyze experimental data on tritium
behavior in Li2O from the BEATRIX-II experiment. Ó 1999 Elsevier Science B.V. All rights reserved.


Source: Abdou, Mohamed - Fusion Science and Technology Center, University of California at Los Angeles
Raffray, A. René - Center for Energy Research, University of California at San Diego


Collections: Plasma Physics and Fusion