As a measure to reduce the amount of contaminated water from the Fukushima Daiichi Nuclear Power Plant, the temperature in the ground has been rising in a part of the “frozen soil wall” that freezes the ground around the buildings to prevent the inflow of underground water.
Tokyo Electric Power Company (TEPCO) has stated that the freezing wall is still functioning, but the cause of the problem is not known at this time.
The “frozen earth wall” is one of the measures to reduce the amount of contaminated water. Pipes are embedded around the buildings of the Fukushima Daiichi Nuclear Power Plant, and liquid at 30 degrees below zero is poured into the pipes and frozen, forming an “ice wall” that prevents underground water from flowing into the buildings.
TEPCO has installed thermometers in the “frozen earth wall” to measure the underground temperature, and it has been above 0 degrees Celsius in some areas on the mountain side of the Unit 4 reactor of the Fukushima Daiichi Nuclear Power Plant since mid-September, rising to 11.29 degrees Celsius on the 12th of last month.
After that, the temperature hovered around 5 degrees and dropped to 1.13 degrees on the 11th of this month, but it rose again to 8.88 degrees on the 14th, 9.65 degrees on the 15th, and 11.03 degrees on the 16th, exceeding 10 degrees for the first time in about a month.
The Tokyo Electric Power Company (TEPCO) investigated the inside of the frozen soil wall from the 10th to the 12th of this month, digging at a depth of about 2.8 meters where the temperature was rising, but could not find the cause.
The Tokyo Electric Power Company (TEPCO) has stated that “there has been no change in the level of groundwater and the function to control the inflow of water has been maintained.