Objectives: Mirion has advanced experience in providing high performance detectors combined with remote systems. • Characterization of spent control rods from decommissioning nuclear plants before they are packaged, shipped and stored as intermediate-level radioactive waste. Key Drivers: During a D&D project, underwater measurements are usually required in several situations such as defueling the reactors and the storage pools, legacy waste stored in ponds, and contaminated natural sites (rivers, ponds, sea....). Underwater nuclear measurements usually have a lower accuracy than ‘in air’ as the water has a higher attenuation on gamma energy and the sample characteristics can be more challenging. SMOPY and ROVING BAT systems have been developed for underwater measurement in t

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