What does misclassification as replacement-in-kind imply in the MOC leading metric?

• A. Automatic approval of the change
• B. Major redesign triggering a full HAZOP
• C. Temporary changes do not require MOC
• D. Substituting components of equal intent without changing design

Answer: (D)

Replacement-in-kind means swapping a component for another that performs the same function and does not change the design or the safety envelope. If the MOC leading metric flags a misclassification as replacement-in-kind, it signals that a change was recorded as a simple, like-for-like substitution when it may not be a true, design-neutral swap. This matters because such misclassification can conceal the need for proper hazard review, even though the substitution is intended to be equal in intent. The essence is substituting components of equal intent without changing design, which is why this option is the best fit. Automatic approval, triggering a full HAZOP, or excluding temporary changes from MOC do not describe replacement-in-kind.