Kansai Electric Power Co. formally submitted an application to the Nuclear Regulation Authority on Thursday for permission to extend the life of its aging Mihama No. 3 reactor for up to another two decades.

The reactor will turn 40 years old in December 2016. Under new rules established by the NRA, an operator may apply for a one-time extension to continue operating a 40-year-old reactor for 20 years, assuming it passes additional safety inspections. Kepco has already applied to extend its Takahama No. 1 and 2 reactors, both of which are now over 40 years old.

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