Japan’s response to the nuclear crisis that followed the March 11 tsunami was confused and riddled with problems, including an erroneous assumption that an emergency cooling system was working and a delay in disclosing dangerous radiation leaks, a report has revealed. The disturbing picture of harried and bumbling workers and government officials scrambling to respond to the problems at Fukushima Dai-ichi nuclear power plant was depicted in the report detailing a government investigation. The 507-page interim report, compiled by interviewing more than 400 people, including utility workers and government officials, found authorities had grossly underestimated tsunami risks, assuming the highest wave would be 6 meters.