Alpha Camera has been developed to check the alpha contamination of solid wastes generated during decommissioning of Fukushima Daiichi Nuclear Power Station (1F). A lot of measurements are needed to reveal the alpha contamination distributions due to the narrow field of view of the Alpha Camera. Therefore, in this paper, we propose a novel approach which reconstructs the divided measurement data in a three-dimensional space to identify the contaminated area easily. In primitive demonstration using new recon...
英字タイトル:
Development of 3D reconstruction for remote alpha contamination measurement

Alpha Camera is developed as a remotely-operated detector to check the alpha contamination of wastes generated during decommissioning of Fukushima Daiichi Nuclear Power Station. The smear method is currently used to check the alpha contamination inside the plant. However, a large amount of waste will be generated from future decommissioning. Therefore, in order to reduce the exposure of workers, a remotely-operated alpha detector with wide range is needed. In this paper, to confirm that the Alpha Camera can...
英字タイトル:
Development of remote alpha contamination measurement detector for field application

Cosmic-ray muon is high energy leptons generated in the earth’s atmospheres as results of cosmic-ray proton/electron bombardment. Muon scattering method has been developed for nuclear security applications using its highly penetrative feature and sensitivity for high Z-materials. This study introduced the measurement of small nuclear reactor which consists of UO2 fuels and simulation study of container scanning system by muon scattering method. These results showed effectiveness of muon scattering metho...
英字タイトル:
Nuclear Security Applications of Cosmic-ray Muon 杉田 宰 Tsukasa SUGITA Non-Member

At the Fukushima Daiichi Nuclear Power Station, it is critical to (1) confirm the presence of fuel debris inside the PCV that could be melted fuel as a result of the hydrogen explosion followed by the accident; and (2) conduct in-depth investigations prior to decommissioning. However, the conditions inside the PCVs were unknown. Under this circumstance, International Research Institute for Nuclear decommissioning (IRID) and Toshiba ESS jointly developed devices that can access to the lower part of a PCV and...
英字タイトル:
Development of Remotely-Operated Devices for Investigation Inside Primary Containment Vessel (PCV) of Fukushima Daiichi Nuclear Power Station Unit 2 and 3 and Survey Results