Overseas Network, January 18. According to the Japanese media "Fukushima Minyou", Tokyo Electric Power Company (Tepco) announced on the 17th that in the partial frozen soil retaining wall of the Fukushima Daiichi nuclear power plant, the frozen pipes used for freezing the foundation Damage occurred, and 4 cubic meters of refrigerant liquid was leaked.
Tepco said that the damage to the freezing pipe had no direct impact on the permafrost retaining wall.
The picture shows the nuclear sewage water storage tank of the Fukushima Daiichi Nuclear Power Plant in Japan on February 13, 2021.
On the morning of the 16th, Dongdian staff found that the water level of the reservoir connected to the freezing pipe and containing the refrigerant material was low.
After inspection, it was found that there was a puddle of refrigerant liquid in the west area between Units 2 and 3 of the nuclear power plant.
The staff immediately closed the valve and stopped the refrigerant supply to the 14 frozen pipes.
Tepco said that after closing the valve, the water level no longer dropped, and the leakage was about 4 cubic meters, which "won't have an impact on the environment."
TEPCO said it will continue to investigate and repair the damage to the frozen pipe after confirming the damage.
The west side of the Fukushima nuclear power plant is on a higher terrain. Previously, a large amount of groundwater flowed into the underground of the building where the reactor was located from west to east, and then turned into nuclear polluted water.
To prevent the increase of nuclear-contaminated water, TEPCO built a permafrost wall around Units 1 to 4 of the nuclear power plant.
The specific method is to bury the freezing pipes at a distance of 1 meter to a depth of 30 meters, inject frozen materials, and use a freezer to cool them to minus 30 degrees Celsius, thereby freezing the surrounding foundation and blocking the groundwater.
Some media pointed out that Fukushima is still not out of the shadow of the nuclear accident, and the scrapping of the Fukushima nuclear power plant is still difficult.
TEPCO originally planned to conduct an investigation into the inside of the nuclear reactor containment of Unit 1 of the Fukushima nuclear power plant, but it was suspended due to an unexpected technical failure during the preparation phase.
TEPCO acknowledged on the 17th that the machine that winds the robot's cable is likely to malfunction, and that electromagnetic waves have affected the system that transmits radiation data.
Japanese media also revealed in November last year (2021) that the permafrost retaining wall of the Fukushima Daiichi nuclear power plant may partially melt.
Tepco's investigation found that groundwater seeps out near a section of the frozen soil wall, which may cause the temperature to rise.
(Wang Shanning from Overseas Network)