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Following the NRC terminology, licensing basis events can be categorized according to their expected frequency as Abnormal Operational Events (AOE, frequency >1´10>1x10-2 per plant-year), Design Basis Events (DBE, frequency >1´10>1x10-4 per plant-year), and Beyond-Design Basis Events (BDBE, frequency >5´10>5x10-7 per plant-year).
For AOEs, the offshore floating plant relies on the traditional systems that have been developed for LWRs, i.e., control rods and standby liquid boron control system (for redundant and diverse emergency shutdown), and shutdown cooling through the auxiliary feedwater system.
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