The correct answers are A, B, and D because CCPS defines Operational Readiness (often implemented through Pre-Startup Safety Reviews, PSSR) as a systematic and consistently applied process to ensure that facilities are safe to start or restart.

Option A (ensure consistent implementation) is critical because inconsistent application of readiness reviews can lead to missed hazards or incomplete verification , increasing risk during startup. CCPS stresses that the process must be standardized and applied every time applicable conditions arise.

Option B (involve competent personnel) is essential because readiness reviews require multidisciplinary expertise , including operations, engineering, maintenance, and safety professionals. Competent personnel ensure that all aspects of safety, procedures, and equipment are properly evaluated.

Option D (determine scope of readiness reviews) is also correct because clearly defining what changes or situations require a readiness review ensures that the process is applied appropriately and comprehensively.

Option C is incorrect because operational readiness should not be limited to only major changes ; it should also apply to minor changes, startups after shutdowns, and other relevant situations where safety could be impacted.

CCPS emphasizes that effective operational readiness ensures systems, procedures, and personnel are fully prepared before introducing hazards , preventing incidents during startup.