US Case Study – Monticello NPP (International Case Study on Organization and Detailed Technical Aspects of NPP Outage Decontamination)

The underwater robot utilized at Monticello NPP to decontaminate the reactor cavity may not have been effective due to potentially recontamination of the cavity after using the robot. I-4.2. Evaluation details: During 1R29, an underwater robot was obtained through a vendor to decontaminate the reactor cavity walls while flooded up. Industry operating experience revealed significant results, to the point that methods of decontamination other than mopping/scrubbing were not required after draining down. Monticello attempted to utilize this robot to capture the efficiency savings with not having to apply a strippable coating.