External MOV periodicity is quarterly.

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Multiple Choice

External MOV periodicity is quarterly.

Explanation:
External MOV periodicity focuses on how often to verify that motor-operated valves outside containment remain operable in safety-related systems. Checking these valves every three months keeps them reliable without overburdening maintenance, catching issues like wear or sticking before they could impact a safe shutdown. The quarterly interval strikes a practical balance between timely detection and workload, since more frequent checks (monthly or weekly) would be unnecessary for most MOVs and less frequent checks (biannual) could miss developing problems for too long.

External MOV periodicity focuses on how often to verify that motor-operated valves outside containment remain operable in safety-related systems. Checking these valves every three months keeps them reliable without overburdening maintenance, catching issues like wear or sticking before they could impact a safe shutdown. The quarterly interval strikes a practical balance between timely detection and workload, since more frequent checks (monthly or weekly) would be unnecessary for most MOVs and less frequent checks (biannual) could miss developing problems for too long.

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