Beyond-Design-Basis Accident
Beyond-design-basis accident (BDBA) exceeds the plant's design-basis events, requiring additional safety features to prevent core damage or containment failure.
BDBAs include station blackout or multiple failures, addressed post-Fukushima via FLEX strategies and core cooling under extended loss of AC power. Mitigation targets maintaining water levels above active fuel and venting hydrogen. NRC orders post-2011 mandate BDBA coping for 72 hours using portable equipment.
Why it matters now
BDBA resilience drives 2025-2026 SMR certifications and restarts like Palisades, critical for investor confidence in data center power reliability. Focus on BDBA informs HALEU reactor safety cases.
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