Migration through membranes of this steel was studied by using permeation cell techniques. In some cases, the up-stream side was covered with a layer of liquid Pb-17%Li alloy. The presence of this layer decreased the permeability by a factor of between 1 and 4 (table 64), and the activation energy for permeation decreased from 52 to 34kJ/mol. This implied that the solubility of D in Pb-17%Li alloy was lower than that in the steel and was almost independent of the temperature. The diffusivities also decreased by a factor of about 2 (table 65) when the Pb-17%Li alloy was present.

O.Gautsch, G.Hoddap: Journal of Nuclear Materials, 1988, 152, 35-40

 

 

 

Table 64

Permeation of D through AISI 316

 

Temperature (K)

Pb-Li Layer

P (m3[STP]/smbar½)

518

yes

3.9 x 10-13

526

yes

4.1 x 10-13

526

no

6.8 x 10-13

540

no

2.7 x 10-13

547

no

1.0 x 10-12

548

yes

5.4 x 10-13

556

yes

6.0 x 10-13

556

no

1.2 x 10-12

570

yes

7.4 x 10-13

584

yes

1.1 x 10-12

586

yes

7.0 x 10-13

589

yes

9.0 x 10-13

589

no

2.3 x 10-12

600

no

3.0 x 10-12

625

yes

1.3 x 10-12

626

yes

1.3 x 10-12

626

no

4.2 x 10-12

629

yes

1.2 x 10-12

632

no

4.8 x 10-12

652

no

6.9 x 10-12

665

yes

2.0 x 10-12

667

yes

2.0 x 10-12

667

no

7.8 x 10-12

680

no

9.0 x 10-12

 

 

 

Table 65

Diffusivity of D in AISI 316

 

Temperature (K)

Pb-Li Layer

D (m2/s)

518

yes

6.8 x 10-13

526

yes

1.2 x 10-12

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

586

yes

2.3 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