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ANSI/ASME/ANS RA-S-1.3-2025
Standard for Radiological Accident Offsite Consequence Analysis (Level 3 PRA) to Support Nuclear Installation Applications
This standard sets forth requirements for the consequence analysis portion of probabilistic risk assessments (PRAs) used to support risk-informed decisions for accidents involving the release of radioactive materials into the atmosphere. This portion of a PRA is typically known as a Level 3 analysis. This Standard also sets forth requirements for risk estimation based on combining the results of the Level 1 and Level 2 (Level 1/2) PRA portions (e.g., release frequencies, release characterizations) and the results of the consequence analysis for a Level 3 PRA.
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American National Standards Institute [ansi]