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Table 2
Description of environmental source terms for Slovakian NPP's (VVER-440/213 unit).
| Source term name | STC6-8d | STC10-8d | STC30-8d |
| Reactor type | VVER | VVER | VVER |
| Initiating event | STATION BLACKOUT– total loss of Alternate Current (AC) power | Break on main circulation line (28 cm2) | Break on the SG primary collector head (14 cm2) |
| Description of scenario | Primary circuit depressurization– SAM; Core damaged; Corium in-vessel retention by application of SAM; CONT damaged; |
Core damaged; RPV failure (SAM– reactor cavity flooding not successful) CONT early damaged; |
Primary circuit depressurization– SAM; Core damaged; Corium in-vessel retention by application of SAM; CONT late damaged; |
| Begin of release (after end of chain reaction) | 11 h (after 56 h through CONT break; height: 25 m) | 4 h (after 18 h through CONT break; height: 25 m) | 14 h (after 92 h through CONT break; height: 25 m) |
| Duration of release | 181 h (136 h through damaged CONT) | 188 h (174 h through damaged CONT) | 178 h (100 h through damaged CONT) |
| Total release | |||
| 131I | 67 PBq | 105 PBq | 3.7 PBq |
| 137Cs | 12 PBq | 18 PBq | 0.7 PBq |
| 133Xe | 930 PBq | 2 000 PBq | 6 400 PBq |
| Radiological equivalent of 131I activitya | 630 PBq | 920 PBq | 38 PBq |
| INES category | 7 | 7 | 6 |
a
Radiological equivalent of the 131I has been calculated according to INES (2009) methodology.
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