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Table 3
Description of environmental source terms for Finnish NPP's.
| Source term name | LO-NCR-APC04 | OL-RHR-12 |
| Reactor type | PWR (VVER440 with ice condenser) | BWR |
| Initiating event | TRANSIENT (loss of feed-water, offsite power and service water) | Loss of heat removal during planned shut-down |
| Description of scenario | Failure of primary circuit depressurization; Core damaged; Corium in-vessel retention – SAM; CONT damaged due to overpressure; |
Core damaged; Failure of RPV 8 h after accident initiation – MCCI; Failure of filtered venting; CONT damaged due to overpressure; |
| Begin of release (after end of chain reaction) | 10 h (after 34 h through CONT break; height: near ground level) | 6 h (after 13 h through CONT break; height: near ground level) |
| Duration of release | 62 h (38 h through damaged CONT) | 32 h (27 h through damaged CONT) |
| Total release | ||
| 131I | 60 PBq | 10 PBq |
| 137Cs | 0.2 PBq | 1 PBq |
| 133Xe | 2 000 PBq | 1 000 PBq |
| Radiological equivalent of 131I activitya | 61 PBq | 55 PBq |
| INES category | 7 | 7 |
a
Radiological equivalent of the 131I has been calculated according to INES (2009) methodology.
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