THE EFFECT OF SOLUTES ON THERMODYNAMIC ACTIVITY OF TRITIUM IN LIQUID LITHIUM BLANKET OF FUSION-REACTOR

The study of tritium dissolved in liquid lithium systems containing me tallic impurities is of technological interest for tritium removal pro cesses and suppression of the tritium leakages from the blanket in a f usion reactor. The interaction parameter formalism and coordination cl uster theory have been used to calculate the tritium activity coeffici ents in Li-T-Al, Li-T-Mg, Li-T-Si, Li-T-Y and Li-T-La systems. Calcula tions performed demonstrated that silicon, aluminium and magnesium hav e no influence on the tritium activity coefficients in dilute lithium solutions within the temperature range 400-800 degrees C, but yttrium and lanthanum may be used to effectively decrease this coefficient in lithium melts.