The Asahi Shimbun: About 120 tons of contaminated water has leaked from an underground storage tank at the Fukushima No. 1 nuclear plant and may have mixed with underground water [...] TEPCO estimated that the water contained about 710 billion becquerels of radioactivity and leaked through the joints of protective sheets of the storage tank. [...] [The water's] highly contaminated because it contains other radioactive materials, such as strontium. The radioactivity level of the water is about 290,000 becquerels per cubic centimeter. [...]
The Asahi Shimbun: TEPCO had been checking for possible leaks by measuring radioactivity levels of water from a hole dug near the tank. Until last month, however, the radioactivity level of the water had been so low that it was impossible to detect any leakage. But on April 3, 20 becquerels of radioactivity per cubic centimeter was detected, followed by 35 becquerels the next day. At 3 p.m. on April 5, workers took water from an area between the clay layer and a polyethylene layer. At 10 p.m. they found that the radioactivity level of the water was about 6,000 becquerels. TEPCO suspects that joints in the sheets of the polyethylene layer had ruptured [...]
Al Jazeera, April 6, 2013: TEPCO detected the leak earlier this week, when radiation levels spiked in water samples collected in between the inner linings of the tank. Radiation levels in water samples taken outside the tank also have increased, an indication of the water leak, TEPCO spokesman Masayuki Ono said. The leak is not only an immediate environmental concern, but threatens TEPCO’s tightrope water management situation, he said.
Published: April 6th, 2013 at 9:29 am ET