In this study, severe accident analyses were conducted for the Advanced Boiling Water Reactor (ABWR) using a detailed nodalization and the impact of MAAP nodalization on the severe accident analysis was investigated. The results of the analysis obtained using a detailed nodalization shows that the PCV temperature is more challenging in comparison to the results of the original nodalization. However, it was found that the structural temperature of the PCV head flange can be maintained below the ultimate temperature of the head gasket when passive mitigation systems are successful, even if no reactor well injection is conducted.

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