Probabilistic Risk Assessment (PRA) is also known as which of the following?

• A. Probabilistic Risk Analysis (PRA)
• B. Probabilistic Safety Assessment (PSA)
• C. Deterministic Safety Analysis
• D. Safety Margin Evaluation

Answer: (B)

PRA methods quantify risk by mapping out possible accident sequences and assigning probabilities to them, then combining these to estimate overall risk metrics such as core damage or release frequency. This probabilistic approach is commonly called probabilistic safety assessment, which is simply another name for PRA used in many safety and regulatory contexts. The PSA term emphasizes evaluating safety under uncertainty, while PRA is the broader risk-analysis label. The alternatives belong to different concepts: deterministic safety analysis uses fixed, conservative scenarios without probabilities, and safety margin evaluation isn’t the standard name for this probabilistic assessment.