Measurements of permeation rate were carried out under steady-state conditions. The permeability was calculated by assuming that there existed a square-root dependence upon the T pressure. It was further assumed that H and T atoms diffused independently. The pressure dependence of the permeability was determined at 961K, using pressures which ranged 8 x 10-9 to 4 x 10-8Pa. The permeability results could be described by:
P (molT/s m Pa½) = 3.84 x 10-7 exp[-73.7(kJ/mol)/RT]
Tritium Permeability and Pressure Dependence of 304L Stainless Steel in the Temperature Range 723 to 1023K. M.Matsuyama, J.D.Redman: Metallurgical Transactions A, 1983, 14[3], 498-500
Table 64
Diffusivity of D in AISI 316
Temperature (K) | Pb-Li Layer | D (m2/s) |
518 | yes | 6.8 x 10-13 |
526 | no | 2.4 x 10-12 |
540 | no | 2.3 x 10-12 |
547 | no | 4.6 x 10-12 |
548 | yes | 1.7 x 10-12 |
556 | yes | 2.0 x 10-12 |
556 | no | 3.7 x 10-12 |
570 | yes | 1.9 x 10-12 |
584 | yes | 2.1 x 10-12 |
589 | yes | 3.2 x 10-12 |
589 | no | 6.0 x 10-12 |
600 | no | 6.8 x 10-12 |
625 | yes | 5.7 x 10-12 |
626 | yes | 5.0 x 10-12 |
626 | no | 9.6 x 10-12 |
629 | yes | 4.6 x 10-12 |
632 | no | 6.9 x 10-12 |
652 | no | 1.0 x 10-11 |
665 | yes | 8.5 x 10-12 |
667 | yes | 8.5 x 10-12 |
667 | no | 1.6 x 10-11 |
680 | no | 1.8 x 10-11 |