This is a DigitalGlobe image of the 5-megawatt (electric) reactor at North Korea's Yongbyon facility, Aug. 31, with steam seen coming from the electrical power generation building. DigitalGlobe/ScapeWare3d/via Getty Images hide caption

itoggle caption DigitalGlobe/ScapeWare3d/via Getty Images

As they inspected an underground storage pool near the crippled Fukushima Daiichi nuclear power plant earlier this month, Tokyo Electric Power Co. President Naomi Hirose (4th from left) and other officials wore protective suits and masks. Radioactive water stored in some of the pits has leaked. Tokyo Electric Power Co./Reuters /Landov hide caption

itoggle caption Tokyo Electric Power Co./Reuters /Landov