One of the key issues in Sunday's Lower House election is the future of Japan's 50 commercial nuclear reactors, all but two of which remain off line in light of the Fukushima disaster.

But few voters are aware that six reactors are operating in the South Korean cities of Busan and nearby Ulsan sit only 200 km from Fukuoka. Both nuclear plants are situated on the country's southeast coast, and their safety situation closely resembles the Fukushima No. 1 plant before it had three core meltdowns in March 2011.

And work has almost finished on two new reactors at the Ulsan facility.