The leak was discovered after lowering the water level in the tank, which is used to estimate the amount of water in the pool to cool the spent nuclear fuel of the second reactor. The water level in the pool itself is normal, TASS reports.

During the inspection of the reactor building, it turned out that about 25 tons of water through sewage systems got into the basements. No leakage to the outside has been recorded.

The injection of water into the pool for cooling the fuel has been suspended, however, as TEPCO assures, this will not lead to exceeding the fuel temperature limit of 65 degrees Celsius. Later, a robot will be introduced into the building of the second power unit for a more detailed examination.

The accident at the Fukushima-1 nuclear power plant occurred in 2011 after a powerful tsunami that disabled its power supply and cooling systems. As a result, nuclear fuel melted in the reactors of three power units, which burned through the protective shells. This was accompanied by hydrogen explosions, which damaged the fourth power unit. At the same time, a large amount of radioactive substances was released, which led to contamination of the areas adjacent to the station. The dismantling of the nuclear power plant is planned to be completed by 2050.