Effects of process-generated hydrogen on RPV walls

1. Reactor pressure vessel

Table 1.1: Material composition in wt% of the different steels used for a RPV [2]. Specification (wt%) SA-508 Class 3 [2] SA-533 Grade B Class 1 [2] SS 308L [5] SS 309L [5] C ≤ 0 . 25 ≤ 0 . 25 ≤ 0 . 03 ≤ 0 . 03 Si ≤ 0 . 40 0 . 15 – 0 . 40 ≤ 1 . 00 ≤ 1 . 00 Mn 1 . 20 – 1 . 50 1 . 15 – 1 . 50 ≤ 2 . 00 ≤ 2 . 00 P ≤ 0 . 025 ≤ 0 . 035 ≤ 0 . 045 ≤ 0 . 045 S ≤ 0 . 025 ≤ 0 . 040 ≤ 0 . 030 ≤ 0 . 030 Ni 0 . 40 – 1 . 00 0 . 40 – 0 . 70 10 . 0 – 12 . 0 12 . 0 – 15 . 0 Cr ≤ 0 . 25 – 18 . 0 – 21 . 0 22 . 0 – 24 . 0 Cu ≤ 0 . 10 – – – Mo 0 . 45 – 0 . 60 0 . 45 – 0 . 60 – – V ≤ 0 . 05 – – –

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