Abstract
It has been about 2.5 years since the Great East Japan Earthquake Disaster and the Fukushima Dai-Ichi Nuclear Plant Accident happened in 2011. Some newly published books still continue to investigate what had happened in East Japan, but the enough volume of the lessons have already been made public. Next, these lessons will be transmitted to the future engineer generation, and should be made good use for the loss reduction of a future disaster/accident. The lessons of the past disasters, for examples, Hanshin-Awaji Earthquake Disaster in 1995, helped to reduce the loss of East Japan Earthquake Disaster at the emergency hospitals. We mechanical engineers have proposed many lessons about the machines, but we, who designed the nuclear plants especially, lost the Japanese people's confidence unfortunately. We should explain the all-inclusive conclusions of a long-term (around 100 years) investigation like historians, and will embed the lessons into the safety machine design.
