Robotic In-Line Inspection of Inaccessible Auxiliary Service Water Lines North Anna Power Station A team from Dominion Energy’s North Anna Power Station used Diakont’s robotic in-line inspection system (RODIS) crawlers to visually and volumetrically inspect auxiliary service water piping. These two lines provide an auxiliary feed from Lake Anna to the plant’s Service Water Reservoir. Portions of these lines were replaced in 1995, and the new 22” lines were sleeved through the two remaining 24” lines; therefore, excavation and visual inspection was not possible. To add additional challenges, these 22”-diameter lines are buried beneath a service road and a railroad track. Both lines have an internal ARC 855 multifunctional epoxy coating with a dry film thickness of 30-40 mils. The pipeline

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