| Research Abstract |
In order to understand the tritium behavior in a blanket system packed with sintered pebbles of micro crystal grains of ceramic breeder material, it is necessary to know the contribution of such tritium transfer steps as
(1) tritium formation reaction in crystal grain, (2) diffusion of tritium in crystal grain to the grain surface, (3) interaction of migrating tritium with irradiation defects formed in crystal grain, (4) absorption of tritium into bulk of crystal grain, (5) adsorption or desorption of tritium on grain surface, (6) isotope exchange reaction between molecular form hydrogen, H_2, in the gas stream and tritium on grain surface (isotope exchange reaction 1), (7) isotope exchange reaction between water vapor, H_20, in the gas stream and tritium on grain surface (isotope exchange reaction 2), (8) water formation reaction on grain surface at addition of H_2 to the blanket purge gas especially at high temperature, (9) transfer of hydrogen isotopes and water through pores of the sintered pebble, (10) transfer of hydrogen isotopes and water through boundary layer formed on the surface of a sintered pebbles to the gas stream.
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