A key difference between deterministic analysis and PRA is that deterministic analysis is based on conservative assumptions, while PRA uses what?

A key difference between deterministic analysis and PRA is that deterministic analysis is based on conservative assumptions, while PRA uses what?

• A. Realistic analyses based on all available methods and equipment
• B. Conservative analyses based on safe design margins
• C. Only qualitative judgments
• D. No analysis at all

Answer: (B)

The key idea is that deterministic analysis relies on fixed, conservative assumptions to ensure safety under worst-case conditions, while PRA treats safety as a probabilistic risk, using probability-based reasoning about how likely different outcomes are. In PRA studies, you still work within safe design margins, but you evaluate risk by quantifying how likely various events are and what their impacts could be, rather than just applying a single conservative bound. That combination of margin-based safeguards with probabilistic evaluation is why the best match among the choices is that PRA uses conservative analyses based on safe design margins.

The key idea is that deterministic analysis relies on fixed, conservative assumptions to ensure safety under worst-case conditions, while PRA treats safety as a probabilistic risk, using probability-based reasoning about how likely different outcomes are. In PRA studies, you still work within safe design margins, but you evaluate risk by quantifying how likely various events are and what their impacts could be, rather than just applying a single conservative bound. That combination of margin-based safeguards with probabilistic evaluation is why the best match among the choices is that PRA uses conservative analyses based on safe design margins.