Japan Radiation Plume Could Reach Tokyo, Scientists Warn

The Union of Concerned Scientists also said a 'jerry-rigged' cooling system at the Japanese plant would be hard to maintain if all workers there were evacuated.

Nuclear power and safety experts at the group said they were 'very concerned' that ongoing activities at the plant would become more challenging for on-site workers. A larger radiation plume could travel hundreds of miles (km), the scientists said in a telephone briefing.

Source: Huffington Post