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On the 19th, TEPCO continued working to resolve the accident in Units 1 and 3 of the Fukushima Daiichi Nuclear Power Plant (Okuma Town, Fukushima Prefecture, Futaba Town), where the water level in the reactor containment vessel dropped more than 30 cm. , several centimeters a day. He announced that he continues to the beat of. Due to the impact of the earthquake with a seismic intensity of less than 6 observed in both locations on the night of the 13th, the part damaged by the accident 10 years ago has spread, and it seems that the amount that leaks into the reactor building is growing.
The nuclear fuel (debris) that melted in the accident remains in the reactor and 3 tons of water is continuously injected for 1 hour to cool it down. We are considering increasing the amount of water injected. There are no changes in the reactor temperature or the amount of radiation in the surroundings.
According to TEPCO, the measured temperature decreased in some of the thermometers in each containment container from the 15th day for Unit 1 and after the 17th for Unit 3. Judging that the thermometer was not submerged in water, it was concluded that the level the water had come down.
From the position of the thermometer, it appears that the water level of 1.9 meters in Unit 1 dropped from 40 to 70 centimeters, and the water level of Unit 3, which was 6.3 meters, dropped about 30 centimeters .
In Units 1 through 3, multiple damage to the containment vessel has been confirmed due to melting (core melting) that occurred 10 years ago. Water that has come into contact with the debris seeps from the damaged part into the building, generating highly concentrated contaminated water. (Kenta Onozawa, Noriyuki Fukuoka)
