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Report No.

Visualization of radioactive substances on a 3D building model of the Fukushima Daiichi Nuclear Power Station

Sato, Yuki  ; Terasaka, Yuta   ; Utsugi, Wataru*; Kikuchi, Hiroyuki*; Takahira, Shiro*; Torii, Tatsuo  

The Fukushima-Daiichi Nuclear Power Station (FDNPS), operated by Tokyo Electric Power Company Holdings, Inc., went into meltdown after the occurrence of a large tsunami caused by the Great East Japan Earthquake on March 11, 2011. The radiation distribution measurements inside the site of the FDNPS are indispensable to execute decommissioning tasks. We have developed a three-dimensional (3D) radiation imaging technique for grasping the location of the high-dose rate region (hotspot) using a compact Compton camera and a photogrammetry technique to create 3D optical images. We succeeded in detecting the hotspot in a waste storage space inside the FDNPS using the Compton camera. We also created the 3D structural model of the waste storage space in the virtual space by using the photogrammetry and superimposed the image of the hotspot on the 3D structural model. Furthermore, we are developing a system that imports the 3D structural model including the image of the hotspot into the virtual reality and allows workers to experience the actual working environment. We believe that these visualization techniques help workers to easily recognize the hotspot at the actual working environment and to decrease their own exposure. These visualization techniques are also effective for planning decontamination and eventually accelerating the decommissioning of the FDNPS.



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