TOKYO (AP) Workers started removing radioactive fuel rods Monday from a reactor building at the crippled Fukushima Dai-Ichi nuclear power plant, Tokyo Electric Power Co. said. The painstaking and risky task is a crucial first step toward a full cleanup of the earthquake and tsunami-damaged plant in northeastern Japan.
The Unit 4 reactor was offline at the time of the March 2011 disaster, and its core didn't melt as Units 1-3 did. But hydrogen explosions blew the roof and walls off the Unit 4 building and weakened the structure, leaving it vulnerable to earthquakes.
Tokyo Electric, known as TEPCO, has since reinforced the building, but experts say keeping so many fuel rods in a storage pool in the building still poses a major safety risk.
"The operation is an important step toward decommissioning Fukushima Dai-ichi, which would take 30-40 years," TEPCO President Naomi Hirose said in a video message on the company's website.
TEPCO has built a massive steel structure next to and partly over Unit 4 to mount cranes for the operation. It will take at least until the end of 2014 to finish moving the 1,533 sets of fuel rods, including 202 unused sets, to a safer location. Each set includes about 60-80 fuel rods containing uranium-based fuel pellets.