Exelon's Peach Bottom Atomic Power Station presents an overview of underground tank corrosion susceptibility inspection performance requirements and pilot project using an automated scanning rig to optimize inspection value while minimizing component downtime.This paper will provide:• Overview of Tank Corrosion Risks as inputs to inspection scope / method selection• Details on Techniques and Critical Success Factors for the project relative to integrity needs• Lessons Learned from Field Implementation• Recommended Actions for future integrity assessments and mitigating actions Results provided clear justification for this technique above traditional limited evaluations performed in the past and may represent a best industry practice for back-up diesel power generation reliability at nuclear power plants.