What is the original goal of PRA?

• A. To maximize plant capacity
• B. To minimize maintenance costs
• C. To analyze and understand severe accident behavior, and then identify and fix the plant vulnerabilities
• D. To optimize fuel usage

Answer: (C)

PRA focuses on understanding how severe accidents could unfold and where the plant is most vulnerable, so you can identify and fix weaknesses before they lead to real events. It builds models of initiating events, how systems might fail or succeed to stop progression, and how different sequences could lead to core damage or releases. By quantifying risk with probabilities and frequencies, PRA helps prioritize safety improvements and design changes that reduce risk. While safety work can influence maintenance planning or operations, the core aim is not to maximize capacity, cut maintenance costs, or optimize fuel use—that would be optimizing for economics or efficiency. The central purpose is to analyze severe accident behavior and address vulnerabilities to lessen risk.