TEPCO summarized the impact of the February 13 earthquake on the Fukushima Daiichi Nuclear Power Station on the 22nd, saying that the water level in the containment vessel containing the reactor continues to decline.
The Nuclear Regulatory Commission said that water injection was ongoing and there were no safety issues, and called for stronger monitoring.
At the Fukushima Daiichi Nuclear Power Plant, water is injected to cool the melted down nuclear fuel, but the water level in the containment vessels of Units 1 and 3 has dropped by several tens of centimeters, and has been on a downward trend since then. ..
▼ In addition, nitrogen is injected into the storage container to prevent hydrogen explosion, and the pressure is high, but at Unit 1, the value of the pressure gauge that measures the difference from the atmospheric pressure drops from 1.2 kilopascals to 0.1 kilopascals, which is almost large. It means that it is at atmospheric pressure.
TEPCO says it will continue to monitor the quake, saying that the damage caused 10 years ago may have spread and the water level and pressure may have dropped.
▼ In addition, it was found that the six tanks that store the water after treating the contaminated water were displaced by up to 5 cm due to the earthquake.
The deviation is within the design assumption, which means that no water leak has occurred.
After the earthquake, the value of the monitoring post did not change, and no radioactive material leaked to the outside.
Upon receiving the report, the Nuclear Regulatory Commission requested TEPCO to strengthen monitoring, saying that cooling of nuclear fuel and nitrogen injection were continued and there were no safety problems at present.