The 2011 Tohoku earthquake and tsunami rocked Japan, causing catastrophic damage to the Fukushima-Daiichi nuclear power plant. The outcome was a meltdown of the plant's number four reactor, causing an environmental disaster not seen since Chernobyl. Now, after two years of careful planning, crews are ready to start the delicate process of removing the reactor's roughly 1500 fuel rods. Once again, here's NHK.
The media entered the Fukushima-Daiichi plant on Wednesday to see the number four reactor building. The building contains more than 1500 fuel units. Most of them have been used. They're extremely hot, highly radioactive, and experts say they need to be kept cool for 30-40 years. The rods are stored in a pool about 20 meters above ground, the water traps radiation and keeps the rods cool. But a hydrogen explosion in 2011 weakened the building's structure. Experts say the rods must be moved to a safer place. Managers of Tokyo Electric Power Company have been preparing to start the job for the last two-and-a-half years. They planned to lift the rods out with a crane, but the building was too weak to support it. So workers built a steel frame. They will transfer the rods to containers that can seal in radiation. They will then move these to a storage facility within the compound and put them back into water. The job is far from straightforward. The workers have to maneuver the rods underwater to prevent any radiation from escaping. And they will have to cope with the high levels of radiation, up to 200 Microsieverts per hour.
The working environment here is more difficult and stressful than usual. Therefore, I want to devote every effort to safely transfer all the fuel rods.
TEPCO officials say it will take more than a year to remove all the rods from reactor number four. Then they will have to do it all over again at the three other reactors. They haven't said when they expect to finish. The operation will start this month. It's the latest hurdle in the long process of decommissioning the plant, a project that's expected to take up to 40 years.