Open Access
Table 3
Role of barriers
| Event | Role of barrier | ||
|---|---|---|---|
| ASTRID600 | Japan’s pool type reactor | ||
| DBA | FP release inside 2nd barrier | 2nd barrier | Primary coolant boundary (2nd barrier) Cover gas boundary (2nd barrier) |
| FP release outside 2nd barrier | 3rd barrier | Containment vessel (3rd barrier) Emergency gas treatment system | |
| DEC | Core melt accident (Non-energetics) | 2nd barrier (retention chamber to be significant) | Containment vessel (3rd barrier) Emergency gas treatment system |
| Core melt accident (Energetics, primary sodium ejection) | 3rd barrier Sodium fire consequences on the 3rd barrier limited by the above roof area | Not considered | |
| Sodium fire in the above roof area with opened polar table | Structural integrity of the building to be maintained | Not considered | |
| Fuel handling accident in the reactor building | 3rd barrier | Ex-vessel transfer machine (EVTM) Emergency gas treatment system | |
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