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It will be argued that in the years before the nuclear disaster, these executives had seen internal reports and simulations warning of the risk of a major earthquake in the region triggering a massive tsunami.
The plant was built to withstand a wave of 5.7 metres in height; the tsunami that struck was 15 metres high.
The operator of the Fukushima Daiichi nuclear power plant ignored warnings that the complex was at risk of damage from a tsunami of the size that hit north-east Japan in March, and dismissed the need for better protection against seawater flooding, according to reports.
Tokyo Electric Power (Tepco) officials rejected "unrealistic" estimates made in a 2008 internal report that the plant could be threatened by a tsunami of up to 10.2 metres, Kyodo news agency said.