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But that dangerous scenario looked likely to happen when TEPCO later told reporters that radiated water had been found in an area called “the trench” outside the No. 2 turbine building the day before. NISA’s Nishiyama later described the trench to reporters as a deep concrete tunnel used to carry electric cables and pipes for the turbine room. Originally he said the cables and pipes had been laid on the ground, but to prevent accidents they were housed inside this tunnel. At one end of the trench there is 16-meter shaft with an inspection manhole and when the manhole was removed, water was found to have leaked into the trench and risen “to a height of 14.9 meters and is increasing,” Nishiyama said. Radiation readings were taken and found to be more than 1000 millisieverts per hour on the surface—similar to the radiation found pooling in the turbine room, from where it has presumably leaked." full article in Spectrum ieee
spectrum.ieee.orgby elainekirk 3/28/2011 8:01:20 PM