The diffusion, solution and permeation coefficients of hydrogen isotopes in liquid Li-Pb which is a candidate liquid blanket material for fusion reactors were determined in the temperature range 573-973K using an unsteady permeation method. Each coefficiens was correlated to temperature as follows:

DLi-Pb = 1.8 × 10-8 exp(-11590/RT) [m2/s]        (1)

KLi-Pb = 2.1 × 10-6 exp(-18700/RT) [1/Pa0.5]        (2)

PLi-Pb = 1.8 × 10-9 exp(-30290/RT) [mol/msPa0.5]        (3)

The hydrogen permeation flux depends on the square root of pressure at 773-973K. Although the power of pressure declined below 0.4 when temperature was below 673K, the effects of surface resistance were neglected above 673K.

The hydrogen solubility in liquid Li-Pbwas found to correlate with a Sievert's constant.

We calculated a height-equivalent to theoretical-plate of a gas-liquid countercurrent extraction tower for tritium recovery rates in liquid Li-Pb to be

HL = 7.0 × 10-2 [m]        (4)