A nuclear nightmare would be nothing new for Japan. And now for the first time since the Fukushima crisis, a major disaster drill is being held to see if lessons have been learned.
More than 3,000 people have been taking part in the two-day exercise in Kagoshima Prefecture. Prime Minister Shinzo Abe even held a mock news conference in Tokyo, announcing a state of emergency.
Under the scenario, an earthquake triggers an accident at a reactor and radioactive material starts leakjng. Many participants were not given advance notice of how events would play out, to test how they would cope in a real-life situation.
Japan has had to rethink its nuclear safety guidelines since the Fukushima plant was damaged by an earthquake and tsunami in 2011.
Since then, operators Tepco have struggled to contain leaking radiation.