Having killed a robot by underestimating the level of radiation present in the Fukushima power plant, and after delaying its previous admission of a leak, Tokyo Electric Power Co. (TEPCO) has quickly admitted that the nuclear plant has sprung another leak. As EFE reports, a small quantity of radioactive water has leaked from a storage tank with 70 microsieverts per hour of beta-ray-emitting radioactivity detected on the surface where the water had leaked, far exceeding the recommended maximum exposure of 0.11 microsieverts per hour. But apart from that it's "contained."

As RT reports,

A total of 40 milliliters of water was discovered, Tokyo Electric Power Co. (TEPCO), the plant’s operator, said on May 1.

The company believes that the liquid leaked from the storage tank, Japan’s Asahi Shimbun paper reported Saturday.

TEPCO stated that it placed bags of sand around the tank to prevent water from contaminating other areas.

The wet patch measuring 20 square centimeters was discovered by one worker at around 9:30am local time on May 1, it added.

According to TEPCO, seventy millisieverts per hour of beta ray-emitting radioactivity were detected on the surface where the water had leaked.

The leak was detected on the same day as tests began in preparation for the construction of a 1.5-kilometer-long frozen soil wall around the reactor buildings.

A project is aimed at preventing further leaks of radioactive water into the sea from the Fukishima plant.

...

In late April, the water transfer pumps at the Fukushima plant were shut down due to a power outage, leading to the leaking of radioactive water into the Pacific Ocean.

It was preceded by a series of toxic leaks in February, which saw around 100 tons of highly radioactive water leaked from one the plant’s tanks.