Which of the following is a use case for PRA?

• A. Significance Determination Process
• B. Mitigating Systems Performance Index
• C. Regulatory Oversight Process
• D. All of the above

Answer: (D)

Probabilistic risk assessment (PRA) provides a quantitative view of how likely different adverse events are and how they contribute to overall plant risk. This information can be used in several key areas.

In the Significance Determination Process, PRA-derived risk significance helps decide how important a finding is to overall plant safety, guiding prioritization and corrective actions based on how much risk the issue adds. In the Mitigating Systems Performance Index, PRA concepts support evaluating the reliability and availability of safety-related mitigating systems, linking equipment performance to changes in risk. In Regulatory Oversight Process, PRA informs risk-informed oversight by focusing inspections and resources where the risk impact is greatest, rather than treating all issues equally.

Because PRA informs all of these uses, the best choice is All of the above.