Causes and lessons of criticality accident in Shinohara, Japan.

From the criticality accident of Shinohara Nuclear Fuel Processing Plant, we found that there were many defects in emergency treatment and rescue and evacuation after the accident. Because the accident unit and the Japanese atomic energy safety management department thought that criticality accident would not happen in advance and did not make corresponding emergency plans for nuclear accidents, the rescue operation after the whole accident was quite slow, and various headquarters were hastily established. The cause of this accident and the lessons to be learned are as follows: The fire brigade of Zhaoji Village received the alarm on September 30th 10: 43, and the alarm only said that there was an urgent patient, so please send an ambulance. Rescuers entered the scene of the accident without knowing the truth and were exposed to different degrees of radiation. Therefore, in the future, both the alarm unit and the fire public security department should learn from it. In order to reduce the damage of nuclear radiation to the field personnel and rescuers as soon as possible and implement effective rescue activities, both sides should bear in mind their due responsibilities and obligations. When an accident happens, the alarm should be timely and active, and the alarm content should be accurate and comprehensive.