Doel 3 & Tihange 2 - Some Peer-reviewed Scientific Papers & Reports

6. Hydrogen concentration in PWR wall

Figure 6.5: Henry coefficient for atomic hydrogen as a function of temperature based on the Himmelblau function, equation 6.3, with T max H and H max H equal to 287 K and 17.9 GPa, respectively.

coefficients, the ratio c i x i

, must be known as a function of temperature.

n i V n i n H 2 O

c i x i c i x i

=

(6.7)

= n H 2 O V

= ρ H 2 O M H 2 O

where n i is the number of mol of species i in a volume of water, V , and n H 2 O is the amount of mol of water molecules in the same volume, V . ρ H 2 O is the density of water in g/m 3 and M H 2 O is the molar mass of water in g/mol. In this equation only the density of water is a function of temperature. The temperature dependency of the density can be found in Figure 5.2. The molar mass of water is 18.015 g/mol. At this point, everything is known to convert the Henry coefficient of atomic hydrogen in GPa to the one in mol/m 3 Pa. The result can be seen in Figure 6.6. For a temperature of 300 ◦ C, the Henry coefficient is found to be 20.0 10 -6 mol/m 3 Pa. 66