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One was found over the weekend in a connecting pipe, and plant operator, Tokyo Electric Power Co., said it suspects three storage tanks where elevated radioactivity was detected also have had leaks.

Nuclear Regulation Authority Chairman Shunichi Tanaka told a news conference that the small leak and possible other leaks have added to concerns about the plant’s stability.

They follow a major leak two weeks ago.  TEPCO reported a loss of 300 tons of highly radioactive water from a steel tank on Aug. 19, saying most of it is believed to have seeped underground but some might have escaped into the sea. The company has yet to determine the cause or exactly where the water went.

More than 300 tanks there are of a similar type. About 1,000 tanks hold 330,000 tons of contaminated water at the plant, and the amount grows by 400 tons daily. The water is part of the makeshift system to keep the radioactive material at the plant stable.  TEPCO also said it overlooked several signs of leaks – increases of radioactivity near the tanks and higher exposure levels for workers – for more than a month. http://www.huffingtonpost.com/2013/09/02/fukushima-leaks_n_3855621.html?ir=World