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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