Record high radiation levels that are lethal even after brief exposure have been detected at a damaged reactor at the Fukushima power plant in Japan. Specialists have also found a hole that's likely been caused by melted nuclear fuel.Radiation levels of up to 530 Sieverts per hour have been detected inside an inactive Reactor 2 at the Fukushima Daiichi nuclear complex damaged during the 2011 earthquake and tsunami catastrophe. A dose of about 8 Sieverts is considered incurable and fatal.