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Report No.
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R&Ds on remote technology and radiation measurements in JAEA towards the decommissioning of FDNPP

Sato, Yuki; Kaburagi, Masaaki; Terasaka, Yuta; Saegusa, Jun; Kawabata, Kuniaki; Wakaida, Ikuo; Torii, Tatsuo

The development of radiation measurement methods in the high dose-rate environment is requested to accelerate implementation of decommissioning of the FDNPP. We are now developing the technology which can measure the 3D distribution of the contamination level with radioactive substances inside the building of FDNPP. Light-weight portable gamma camera is to be developed, and is used for drones that can remotely measure the radiation distributions in the high radioactive fields where workers are not allowed to enter and remain there. Radiation hard sensors that can measure the shapes and nuclide distributions of residual debris inside the reactor pressure vessel (RPV) and primary containment vessel (PCV) are also to be developed. Multi-layer silicon strip detector (SSD) is one of the candidate sensor, which can measure the above information on the debris because SSD can measure the energies and incident directions of the $$gamma$$-rays emitted from the debris. Fast-decay scintillator which has the high density and superior radiation hardness are also developed for measurement of the $$gamma$$-rays emitted from the debris. We are now investigating the radiation hard optical fibers which can transmit the scintillation light under high dose-rate environment. We introduce our recent study about such radiation imaging technology and sensing technology of fuel debris.

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