Japan pauses restart of world’s largest nuclear power plant one day after it went online

Operator says it does now know when the problem at the Kashiwazaki-Kariwa plant in Niigata province will be solved, after an alarm sounded during start-up

The restart of the world's largest nuclear power plant was suspended in Japan on Thursday just a day after it went online for the first time in about 14 years, with the operator saying it does not know when the problem will be solved.

The Kashiwazaki-Kariwa plant in Niigata province had been closed since the 2011 Fukushima disaster, but operations to relaunch it began on Wednesday after it received the final green light from the nuclear regulator.