Japan's nuclear safety agency says workers have entered a reactor building at the Fukushima Daiichi nuclear power plant for the first time since an explosion hit the facility after the March 11 earthquake and tsunami.
The plant's operator, the Tokyo Electric Power Company, said workers were planning to spend only about 10 minutes each inside the No. 1 reactor building to install ventilation machines in an attempt to filter out radioactive material from the air.
The high radiation levels inside the building have so far prevented workers from entering to repair the reactor's cooling systems, which were disabled out by the quake and tsunami.
The Fukushima plant has been leaking radiation into the air, ground, and sea since the twin disaster, in the world's worst nuclear crisis since Chornobyl in the former Soviet Union 25 years ago.
compiled from agency reports