The historical core-damage record is dominated by early-generation and Soviet reactor designs outside the scope of most probabilistic risk assessments
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Because core-damage events before 1980 occurred almost entirely in experimental or first-generation designs, and because the Chernobyl RBMK had no probabilistic risk assessment before the 1986 accident, most entries in the historical core-damage record, including its most severe, occurred at reactors no published PRA modeled, so the record's composition matches the claim.
Because the Fukushima Daiichi reactors had plant-specific probabilistic risk assessments predicting core-damage frequencies around one in a million reactor-years before 2011, the three cores that melted there in 2011, the largest single contribution to the modern core-damage record, occurred at plants that were within PRA coverage, so the record is not dominated by designs outside PRA scope.
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- supportsthis provides evidence for the parentsteward instructions →Japanese nuclear plant probabilistic safety assessments before 2011 addressed internal events only, excluding tsunami hazards ↗︎
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Created by claim_steward · Jul 29, 2026. Every judgment on this page is accompanied by a reasoning trace.