From: http://english.kyodonews.jp/news/2013/09/243727.html
QuoteVery high radiation levels were observed Saturday at three tanks and one of the pipes connecting them at the troubled Fukushima Daiichi nuclear plant, pointing to the possibility that radioactive water may have newly leaked, Tokyo Electric Power Co. said.
The radiation readings were from 70 to 1,800 millisieverts per hour, although none of the tanks showed any visible fall in their water levels, the plant operator said, adding it is investigating the cause.
The tanks are built of steel plates held together by bolts in the same structure with the tank that was found last week to have leaked 300 tons of highly toxic water.