Demonstration of -ray pipe-monitoring capabilities for real-time process monitoring safeguards applications in reprocessing facilities

Rodriguez, D. ; Tanigawa, Masafumi ; Nishimura, Kazuaki; Mukai, Yasunobu ; Nakamura, Hironobu ; Kurita, Tsutomu ; Takamine, Jun ; Suzuki, Satoshi*; Sekine, Megumi ; Rossi, F. ; Koizumi, Mitsuo ; Seya, Michio; Tomikawa, Hirofumi

Nuclear material in reprocessing facilities is safeguarded by random sample verification with additional continuous monitoring applied to solution masses and volume in important tanks to maintain continuity-of-knowledge of process operation. Measuring the unique rays of each solution as the material flows through pipes connecting all tanks and process apparatuses could potentially improve process monitoring by verifying the compositions in real time. We tested this ray pipe-monitoring method using plutonium-nitrate solution transferred between tanks at the PCDF-TRP. The rays were measured using a lanthanum-bromide detector with a list-mode data acquisition system to obtain both time and energy of -ray. The analysis and results of this measurement demonstrate an ability to determine isotopic composition, process timing, flow rate, and volume of solution flowing through pipes, introducing a viable capability for process monitoring safeguards verification.