How does LOPA determine whether additional IPLs or design changes are needed?

• A. More IPLs are required whenever there is any risk.
• B. If residual risk exceeds risk tolerance, more IPLs or design changes are required.
• C. LOPA removes the need for additional controls.
• D. If risk tolerance is not defined, no actions.

Answer: (B)

LOPA decides whether additional IPLs or design changes are needed by comparing the residual risk after the existing Independent Protection Layers to a defined risk tolerance (risk target). If the residual risk is higher than the tolerance, additional IPLs or a design change are warranted to bring risk down to acceptable levels. This approach uses a predetermined acceptability threshold rather than assuming any level of risk requires more controls. It’s important to note that LOPA doesn’t remove the need for controls; it helps determine when new safeguards are necessary. If risk tolerance isn’t defined, you can’t determine actions because there’s no target to compare against.