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2 July, 2021

Mihama-3 Restarted After Decade-long Hiatus: First Restart in Japan of a Reactor Operating Beyond 40 Years

On June 29, the Mihama-3 Nuclear Power Plant (PWR, 826MW) of the Kansai Electric Power Co. (Kansai EP) began to again generate power after a hiatus of slightly more than 10 years.

Unit 3 is on the rightMihama-3 originally began commercial operation in December 1976. In May 2011, the unit entered a periodic inspection, when it underwent examinations by the Nuclear Regulation Authority (NRA) for compatibility with the new regulatory standards and for permission to extend its operating lifetime to up to 60 years. The unit was restarted on June 23, 2021, becoming the first in Japan to be restarted after operating for more than 40 years. A period of adjustment operations is now underway before the final stage of the periodic inspection, i.e., connection to the grid. After a final inspection by the NRA, Mihama-3 is expected to resume commercial service on July 27. In addition to work on safety measures based on the accident at the Fukushima Daiichi, Kansai EP carried out other kinds of w...more
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