According to NHK, there is a possibility that the frozen ground wall that prevents groundwater from flowing into the Fukushima Daiichi Nuclear Power Plant, which exploded during the 2011 Great East Japan Earthquake, may have melted, NHK reported.
The frozen soil wall is one of the measures to reduce the polluted water from the Fukushima Daiichi Nuclear Power Plant.
Fukushima contaminated water is generated by groundwater and rainwater flowing into the accident nuclear power plant.
It is a structure that prevents groundwater from flowing into the nuclear power plant building by injecting a minus 30 degree liquid around the nuclear power plant building to create a frozen soil wall.
However, in some areas close to the 4th nuclear power plant, the temperature has exceeded 0 degrees since mid-September, and it was found that on the 18th of this month it rose to 13.4 degrees.
When TEPCO dug the frozen soil wall in the area, water was found where it should have been frozen.
This raises the possibility that part of the frozen soil wall may have melted.
TEPCO told NHK that there is no change in the water level inside the frozen earth wall near the nuclear power plant building, and that the function of the frozen earth wall is maintained overall.
TEPCO cleans and stores the polluted water generated by about 150 tons per day with a device called a multi-nuclide removal facility.
However, even if it is purified, the radioactive substance tritium contained in the contaminated water is not filtered out.
The Japanese government announced that from the spring of next year, the purified water will be diluted with seawater to lower the tritium concentration and then be discharged off the coast of Fukushima.
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