Latest leak at Japan's Fukushima plant contaminates 6 workers

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In the latest incident, a worker mistakenly detached a pipe connected to a treatment system to remove salt from the hundreds of tonnes of water Tepco pumps over the melted fuel in wrecked reactors at Fukushima to keep them cool.

"It is serious in that it was another problem caused by carelessness, but I do not believe it is a seriously troubling dosage," Shunichi Tanaka, chairman of Japan's Nuclear Regulation Authority, said on Wednesday. "But the fact that there has been a string of incidents occurring on a daily basis that could have been avoided - I think that is the large problem."

Tanaka urged Tepco to improve its handling of contaminated water, but stopped short of saying if it faced any penalties.

Tepco said seven tonnes of water were spilled in Wednesday's incident at the treatment facility but were contained within the site, adding that the leaked water had an all-beta radiation level of 34 million becquerels per litre.
Tanaka said the leaked water had already been treated to remove cesium, which emits strong gamma radiation harmful to humans.