Effects of process-generated hydrogen on RPV walls

7. Hydrogen pressure in PWR

Inner surface Coolant temperature profile (see Fig. 7.1) (b) Material properties. Material Property Function Unit SS309 Thermal conductivity (k) k=12 . 66915 + 0 . 007786814 · T 1 W/ ( m · K ) Heat capacity (Cp) Cp=109 . 2073 + 2 . 572 · T 1 − 6 . 528 · 10 − 3 · T 2 + 7 . 787 · 10 − 6 · T 3 J/ ( kg · K ) − 4 . 168 · 10 − 9 · T 4 + 8 . 091 · 10 − 13 · T 5 Density ( ρ ) ρ = 8133 . 062 − 0 . 2803 · T 1 − 1 . 242 · 10 − 4 · T 2 kg/m 3 SA508 Cl.3 Thermal conductivity (k) k=113 . 4337 − 0 . 0293 · T 1 − 6 . 503 · 10 − 4 · T 2 W/ ( m · K ) +9 . 676 · 10 − 7 · T 3 − 2 . 594 · 10 − 10 · T 4 Heat capacity (Cp) Cp= − 215 . 7306 + 6 . 0185 · T 1 − 0 . 0183 · T 2 J/ ( kg · K ) +2 . 415 · 10 − 5 · T 3 − 1 . 079 · 10 − 8 · T 4 Density ( ρ ) ρ = 7919 . 309 − 0 . 1249 · T 1 − 2 . 886 · 10 − 4 · T 2 + 1 . 1317 · 10 − 7 · T 3 kg/m 3

(a) Initial and boundary conditions. Position Condition Initial condition RPV wall T = 573 . 15 K Boundary conditions Outer surface dT dx =0

Table 7.1: Data used for the calculation of the temperature profile in the RPV wall during a cold shutdown. (a) The initial and boundary conditions. (b) The physical properties of the RPV materials, necessary for the temperature calculation in the RPV wall.

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