Tsunehisa Katsumata, who was Tepco’s chairman at the time, has been charged with professional negligence resulting in death, along with two former vice-presidents, Sakae Muto and Ichiro Takekuro. The men, who have not been taken into custody, allegedly failed to take measures to defend Fukushima Daiichi, despite being aware of the risk from a tsunami. Three of the plant’s six reactors went into me