A long robot has entered a damaged reactor at Japan's Fukushima nuclear power plant to retrieve a tiny amount of melted fuel debris for the first time. This marks the beginning of a crucial two-week mission in Unit 2 reactor, initiating a high-stakes process in the decommissioning of the plant.
Understanding Fuel Debris
The melted fuel debris, a result of the 2011 earthquake and tsunami, consists of nuclear fuel that dripped down from the reactor cores and mixed with various internal materials. Tokyo Electric Power Company Holdings estimates around 880 tons of molten fuel debris remain in the three reactors.
Robot's Mission
The robot, equipped with tongs, a light, and a camera, will collect a small sample of the debris weighing less than 3 grams. The robot will be remotely operated due to high radiation levels emitted by the debris, making precise maneuvers to avoid obstacles during its two-week journey.
Significance of the Mission
Sampling the melted fuel debris is a crucial first step in the decommissioning process. The sample will provide insights into the condition of the debris, aiding in the development of strategies for its removal, storage, and disposal.
What Lies Ahead
Future challenges include developing robots capable of cutting larger chunks of debris for safe storage. The decommissioning process, initially planned for late 2021, faces technical delays, with estimates ranging from 30 to 100 years for completion.
Despite calls for entombment, experts emphasize the need for a meticulous approach due to the plant's location in a high seismic and water area, highlighting the complexity and uncertainties involved in the cleanup process.
