Which statement describes the reactor secured criteria?

Which statement describes the reactor secured criteria?

• A. All three listed criteria: 1) console key off and removed, 2) no work involving fuel/core unless decoupled, 3) no experiments exceeding 720 pcm.
• B. Only the first criterion is required.
• C. Only the second criterion is required.
• D. Only the third criterion is required.

Answer: (A)

Securing the reactor requires multiple safeguards that cover access, fuel handling, and reactivity management, all of which must be in place together. First, having the console key off and removed stops anyone from using the controls, preventing inadvertent or unauthorized actions that could alter plant conditions. Second, no work involving fuel or core unless the system is decoupled protects against accidental fuel handling or configuration changes that could raise reactivity or exposure, by ensuring the core is isolated during maintenance. Third, no experiments exceeding 720 pcm keeps any reactivity changes within a conservative limit, preserving time to respond and reducing the risk of an excursion. All three criteria together ensure that control access, fuel safety, and reactivity limits are addressed simultaneously. If only one criterion were required, the other two risks—uncontrolled control access, unsafe fuel handling, or a dangerous reactivity insertion—would still exist. That’s why the statement that all three listed criteria are required best describes the reactor secured criteria.

Securing the reactor requires multiple safeguards that cover access, fuel handling, and reactivity management, all of which must be in place together. First, having the console key off and removed stops anyone from using the controls, preventing inadvertent or unauthorized actions that could alter plant conditions. Second, no work involving fuel or core unless the system is decoupled protects against accidental fuel handling or configuration changes that could raise reactivity or exposure, by ensuring the core is isolated during maintenance. Third, no experiments exceeding 720 pcm keeps any reactivity changes within a conservative limit, preserving time to respond and reducing the risk of an excursion.

All three criteria together ensure that control access, fuel safety, and reactivity limits are addressed simultaneously. If only one criterion were required, the other two risks—uncontrolled control access, unsafe fuel handling, or a dangerous reactivity insertion—would still exist. That’s why the statement that all three listed criteria are required best describes the reactor secured criteria.