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<p><b>New page</b></p><div><!-- PAGE METADATA<br />
page_type: methodology_overview<br />
page_id: METHOD_BDB<br />
canonical_hazard_id: N/A<br />
related_hazard_ids: N/A<br />
authoritative: true<br />
revision_date: 2026-05-20<br />
status: placeholder_v1.0<br />
summary: Overview of beyond design basis concepts, frameworks, and their role in external hazard assessment for nuclear power plants.<br />
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'''Beyond Design Basis'''<br />
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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.<br />
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{{#tag:div|'''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.|style=background:#E8F4FD;color:#1B4F72;padding:16px;border:2px solid #85C1E9;border-radius:8px;font-size:110%;margin:24px 0;text-align:center;}}<br />
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''Return to [[Methods and Tools]].'' | ''EPRI technical point of contact: Chris Rochon ([mailto:CRochon@epri.com CRochon@epri.com])''<br />
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''Date last reviewed: 2026-05-20''</div>10.1.236.167