Abstract
Peach Bottom Atomic Power Station presents a novel approach for developing a conservative, justifiable, and commercially-sustainable corrosion rates for first-time inspections in raw water piping. Analysis is performed on a risk-conscious basis to piping systems based upon failure consequence and uncertainty, contrasting the typical approach of reporting location-specific, time-averaged rates. This investigation leverages actual plant-wide piping inspection data, leak history, repair history, and corrosion monitoring results together to inform integrity decisions based on experience at a reliably-operating, nuclear power plant. Results can be used to bracket future risks and drive more complete corrosion prediction, evaluation, and mitigation projects while minimizing total operating costs. While most data is from in-plant raw water piping, this approach can be applied to any corrosive system / location and is presented in a step-wise fashion for readers to follow / apply on their own. This Work was completed as part of the Station's compliance with the Nuclear Underground Piping & Tanks Integrity Initiative as committed to the industry under Nuclear Energy Institute (NEI) (1)09-14. 1
