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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