Since immediately after the Fukushima Daiichi Accident, Mitsubishi Heavy Industries, Ltd. has been cooperating with the efforts of Tokyo Electric Power Company Holdings, Incorporated toward the early stabilization of the power station. Currently, various projects are underway at the Fukushima Daiichi Nuclear Power Plant to achieve early stabilization, including fuel removal and contaminated water treatment, but the core of early stabilization is the retrieval of the fuel debris, which is the molten, cooled, and solidified nuclear fuel and reactor internals, and this is considered to be the most technically challenging part of them. This paper presents the details of the successful trial extraction of the fuel debris by the equipment developed by Mitsubishi Heavy Industries, Ltd.
