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TOKYO — The Tokyo Electric Power Co. said Saturday that a filtration system it had struggled to put into operation at the damaged Fukushima Dai ichi nuclear power plant had broken down after five hours.
The company said the sprawling system, which is designed to siphon oil, radioactive materials and salt from the water used to cool the reactors, was shut down because of readings that indicated one of the filters had filled with radioactive cesium. The filter was supposed to have lasted several weeks.
