Effects of process-generated hydrogen on RPV walls

5. Hydrogen production in PWR

The summation of the reaction rates over all reactions for all species, results in equation 4.12. The reaction rate constant, k , is temperature dependent and given by the Arrhenius law, as mentioned in the previous chapter.

R

1 T

1 T 0 −

E a

k = k 0 exp

(5.15)

The reaction rate constants at room temperature and the activation energies for each of the 60 reactions are given in Table 5.2. Table 5.2: Reaction rate constants for the chemical reactions.

Reaction k 0 at 298 K

Reaction k 0 at 298 K

E a

E a

number

[l/mol s] 1.6 10 1 2.4 10 10 2.4 10 10 1.3 10 10 1.0 10 10 2.0 10 10 1.9 10 10 5.0 10 9 4.5 10 9 1.2 10 10 1.2 10 10 2.0 10 7 4.5 10 8 6.3 10 7 1.44 10 11 2.6 10 -5 2.0 10 10 3.4 10 7 2.7 10 7 4.4 10 7 1.9 10 10 8.0 10 5 5.0 10 10 2.7 10 6

[kcal/Mol]

number

[l/mol s] 1.7 10 7 2.0 10 10 2.0 10 10 1.3 10 8 1.8 10 8 1.04 10 -4 1.02 10 4 1.5 10 7 7.7 10 -4 7.88 10 9 1.28 10 10 6.14 10 6 3.97 10 9 6.42 10 14 2.72 10 -3 2.84 10 10 1.1 10 6 1.3 10 10 0.5 10 0 0.13 10 0 2.56 10 -8 1.39 10 10 1.39 10 10 1.9973 10 -6

[kcal/Mol]

1 2 3 4 5 6 7 8 9

3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 4.6 3.4 4.5 3.0 3.0 3.0 4.5

25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

4.5 3.0 3.0 4.5 4.5 4.5 7.3 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.2 3.2

14.8

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

15.0

50