In response to the drop in the water level inside the containment vessel at Unit 1 of the Fukushima Daiichi Nuclear Power Station after the earthquake on the 16th of this month, TEPCO will increase the amount of water that cools the reactor from the 23rd, and the water level will rise. We are still investigating the detailed cause of the decline.
At the Fukushima Daiichi Nuclear Power Plant, water injection is being continued to cool the "fuel debris" that is a mixture of nuclear fuel and structures that melted down in the accident. The water level in the containment vessel has dropped by about 40 cm.
For this reason, TEPCO announced that it has increased the amount of water injected into the reactor from 3.5 cubic meters per hour to 5.5 cubic meters from the 23rd in order to return the water level to the pre-earthquake level.
So far, there is no problem with cooling the "fuel debris".
At Fukushima Daiichi Nuclear Power Station Unit 1, the water level in the containment vessel dropped during the earthquake in February last year, and it seems that the cause was that the damaged part expanded due to the influence of the shaking, so we will investigate in detail this time as well. I have decided.