Once Japan's leaky nuclear complex stops spewing radiation and its reactors cool down, making the site safe and removing the ruined equipment is going to be a messy ordeal that could take decades and cost hundreds of millions of dollars.

Radiation has covered the area around the Fukushima No. 1 plant and blanketed parts of the complex, making the job of "decommissioning" the plant — rendering it safe so it doesn't threaten public health and the environment — a bigger task than usual.

Toshiba Corp., which supplied four of Fukushima's six reactors, including two on which General Electric Co. collaborated, submitted a road map this past week to the plant's operator for decommissioning the crippled reactors. The study, done with three other companies, projects that it would take about 10 years to remove the fuel rods and the reactors and contain other radioactivity at the site, said Keisuke Omori of Toshiba.