5 July 2012, the National Diet of Japan Fukushima Nuclear Accident Independent Investigation Commission (NAIIC) found that the causes of the accident had been foreseeable, and that the plant operator, Tokyo Electric Power Company (TEPCO), had failed to meet basic safety requirements such as risk assessment, preparing for containing collateral damage, and developing evacuation plans. At a meeting in Vienna three months after the disaster, the International Atomic Energy Agency faulted lax oversight by the Japanese Ministry of Economy, Trade and Industry, saying the ministry faced an inherent conflict of interest as the government agency in charge of both regulating and promoting the nuclear power industry. On 12 October 2012, TEPCO admitted for the first time that it had failed to take necessary measures for fear of inviting lawsuits or protests against its nuclear plants. Plant description The Fukushima Daiichi Nuclear Power Plant consisted of six General Electric (GE) light water boiling water reactors (BWRs) with a combined power of 4.7 gigawatts, making it one of the world's 25 largest nuclear power stations. It was the first GE-designed nuclear plant to be constructed and run entirely by the Tokyo Electric Power Company (TEPCO). Reactor 1 was a 439 MWe type (BWR-3) reactor constructed in July 1967, and commenced operation on 26 March 1971. It was designed to withstand an earthquake with a peak ground acceleration of 0.18 g () and a response spectrum based on the 1952 Kern County earthquake. Reactors 2 and 3 were both 784 MWe type BWR-4s. Reactor 2 commenced operation in July 1974, and Reactor 3 in March 1976. The earthquake design basis for all units ranged from 0.42 g () to 0.46 g (). After the 1978 Miyagi earthquake, when the ground acceleration reached 0.125 g () for 30 seconds, no damage to the critical parts of the reactor was found. Units 1–5 have a Mark-1 type (light bulb torus) containment structure (see also Containment building#Boiling water reactors); unit 6 has Mark 2-type (over/under) containment structure. In September 2010, Reactor 3 was partially fueled by mixed-oxides (MOX). At the time of the accident, the units and central storage facility contained the following numbers of fuel assemblies: There was no MOX (mixed oxide) fuel in any of the cooling ponds at the time of the incident. The only MOX fuel was loaded in the Unit 3 reactor. Cooling Nuclear reactors generate electricity by using the heat