Delicate Removal Process to Begin at Fukushima Daiichi
The decommissioning of the Fukushima Daiichi nuclear power plant is set to enter a crucial phase with the planned removal of melted nuclear fuel debris from one of the damaged reactors. This delicate operation, resembling a fishing expedition, will utilize a specialized device to extract tiny bits of the radioactive material.
The work, expected to commence in October, will initially be conducted on a trial basis. The chosen reactor for this initial attempt is the No. 2 unit, where radiation levels are comparatively lower. This cautious approach reflects the extreme challenges posed by the high radiation levels within the wrecked facility.
The removal process will involve a 22-meter-long device, designed like a fishing pole, being inserted into the reactor's pressure vessel. This device, equipped with a claw-like arm, will attempt to grasp and extract the fuel debris, represented by pebbles in the demonstration model.
The initial plan, formulated by the government and TEPCO, envisioned the start of fuel removal in 2021. However, the process faced multiple delays due to the COVID-19 pandemic and technical issues. The originally intended robotic arm lacked the necessary precision for the task, leading to a revised approach.
TEPCO's current strategy involves a two-stage process. The initial stage will utilize the simpler rod-style system for a cautious start, followed by the deployment of the robotic arm in the subsequent stage. This phased approach aims to ensure a safe and efficient removal of the melted nuclear fuel debris.