The World's Oldest Operating Nuclear Power Reactors 

By Amelia Hennighausen and Eric Roston - 2013-10-18T17:24:06Z

Photograph by The Asahi Shimbun via Getty Images

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5. Tsuruga, Japan

Japan Atomic Power opened its Tsuruga Unit 1 reactor on March 14, 1970. Unit 2 followed in 1987. A so-called fast-breeder reactor, which is more efficient than older models, was built after that but isn't in use.

The Tsuruga power station is being investigated for active fault lines that run under it, as part of a safety overhaul following the Fukushima disaster. About 10 percent of the world's earthquakes hit Japan.

Left, members of the nation's Nuclear Regulatory Authority examine a fault running through the premises of Japan Atomic Energy Agency's fast-breeder "Monju" reactor, on July 17.

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