Tokyo Electric Power Company says more radioactive wastewater has leaked from its Fukushima Daiichi nuclear plant. The water contained high levels of strontium.
Workers at the plant discovered the leak at around 1:00 AM on Thursday. They noticed an increase in water flowing through a pipe connected to a wastewater tank.
Workers shut valves. The flow stopped just over an hour later. But the company says some of the wastewater may have flowed into a ditch leading to the ocean.
TEPCO has apologized for the incident and says it will determine the cause and extent of the leakage.
Contaminated wastewater also leaked on March 26th from a different section of the same piping.
Last December, water leaked from another device within the plant compound.
In both cases, the wastewater is believed to have flowed into the sea.