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One week after a radiation leak prompted a shut down at San Onofre, the nuclear plant's Unit 3 reactor remains offline.
The reactor was finally cool enough on Monday for workers to install inspection equipment, but it was unclear how long the unit would remain out of service, according to plant operator Southern California Edison and officials at the Nuclear Regulatory Commission, reports U-T San Diego.
During an inspection, unusual wear was found on hundreds of steam generator tubes pumping radioactive water in Unit 2, however that reactor is still in service. The NRC said tubes showed excessive wear. Edison called the findings preliminary.
Over the past two years, generators in both reactors were replaced with $670 million worth of new equipment manufactured in Japan by Mitsubishi Heavy Industries.
Edison said it does not yet have an estimate for replacement energy costs incurred during this unplanned shutdown.
Um. A worker also fell into a reactor pool.