Feasibility study of Pu monitoring technology for Pu solution with FP; Overview and research plan

Sekine, Megumi ; Ishiyama, Koichi ; Nakamura, Hironobu ; Tomikawa, Hirofumi

Plutonium (Pu) solution and solid waste containing fission products (FP) are stored in a reprocessing plant as inventory or retained waste. It is difficult to access the Pu with FP since it has an extremely high radiation dose rate, and there is no direct Pu continuous monitoring/verification technology. From a viewpoint of ensuring nuclear transparency, Japan Atomic Energy Agency (JAEA) has started to develop a new technology using non-destructive assay to measure and monitor Pu solution with FP since JFY 2015. The technology could be applicable to Pu concentration monitoring throughout the reprocessing process. In the poster presentation, an overview of the technology development, simulation results of preliminary evaluation of the characteristics of radiation emitted from the high level radioactive liquid waste tank at Tokai Reprocessing Plant, where the test field is located, and the future research plan are presented.