Development of Verification System for Solid Waste

Solid wastes generated from MOX fabrication facility have to be verified during inspection as same as nuclear fuel material according to the IAEA safeguards criteria. On the other hand, from storing them efficiently point of view, solid waste drums have to be piled up (3 layers). However, it was very difficult to take out the drums selected randomly for verification of piled-up drums. So, it was necessary to develop new verification system which measures the selected drum easily and speedily without moving it. The system measures the waste drum directly by using narrow space of pallet for forklift-nails. This system consists of NaI(TI) detector, collimator with wheels, PMCA (Portable Multichannel Analyzer ), rails and cables. This system is very small and not heavy because of easy operating in narrow space and high position. As a result of test measurement by this system, an existence of Pu in drum could be confirmed by counting y -Ray of Pu -241 ( 208 ke V ). After calibration by JNSB and IAEA, an application of this system was commenced as verification method of solid waste.