Methods/Beyond Design Basis
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Beyond Design Basis
The design basis of a nuclear power plant defines the set of conditions and events that the plant is explicitly designed and licensed to withstand. Beyond design basis (BDB) events or accidents are those initiating events or accident conditions that are less frequent and/or more severe than the plant’s design basis events and therefore were not fully accounted for in the original design requirements, although they may be analyzed to understand plant capabilities and to plan additional mitigation.
MORE INFO COMING SOON — This page is under active development. Detailed content will be available in an upcoming update to the External Hazards Knowledge System.
Return to Methods and Tools. | EPRI technical point of contact: Chris Rochon (CRochon@epri.com)
Date last reviewed: 2026-05-20