Why is wall-thickness monitoring important in aging management of piping?

• A. To monitor overall plant vibration.
• B. To measure flow rates in the piping system.
• C. To detect wall thinning due to corrosion, erosion, or flow-accelerated corrosion, ensuring the integrity of the pressure boundary.
• D. To track the coolant temperature distribution.

Answer: (C)

Wall-thickness monitoring directly tracks how thick the pipe walls are, which is the clearest indicator of whether the pressure boundary remains able to contain the coolant safely as components age. Over time, pipes can lose material due to corrosion, wear from flow (erosion), or accelerated metal loss from flow-accelerated corrosion. By measuring wall thickness at critical locations, engineers can detect thinning early, evaluate the remaining structural margin, and decide when to repair, replace, or mitigate—without waiting for a leak to occur. This keeps the reactor’s piping safe and reliable and supports informed maintenance planning and life-extension decisions.

Vibration, flow-rate measurements, or coolant temperature distribution serve other purposes (mechanical integrity monitoring, process control, or thermal-hydraulic assessment) and don’t provide the direct, material- integrity readout that wall-thickness data offer for aging management.