At around 8:30 am on March 26, 2012, in the area of condensed water tanks for water desalinations (reverse osmosis membrane) of Fukushima Daiichi Nuclear Power Station, a partner company worker found that water was leaked from a pipeline (anti-pressure hose) which transferred the condensed water from the water desalinations to the condensed water tanks.
In order to stop the water leakage, at around 8:50 am, we stopped the transfer pumps of the water desalinations (reverse osmosis membrane) and then the leakage stopped. After that, we closed the valves at the both sides to the leakage point of the pipeline (anti-pressure hose).
When we checked the leakage on the site later, we found that a part of the leaked water had been poured into a nearby drainage for general draining water. And then we conducted sampling surveys on the leaked water, the water which was poured into the drainage, and the seawater around the exit of the drainage.
As a result, we judged that some water including radioactive materials was poured into the sea from the exit of the drainage located at about 300 m south from the discharge channel of Unit 1-4 of Fukushima Daiichi Nuclear Power Station.
With regard to the discharge of radioactive water, we deeply apologize again for serious anxiety and nuisance of the people who live in the nearby area and the people of the society.
At this moment, the water desalinations (reverse osmosis membrane and evaporative concentration apparatus) are not in service. However, because we have much treated fresh water, it does not affect water injection to the reactors.
Water leakage point at concentrated water storage tank area of water desalinations (reverse osmosis membrane) in Fukushima Daiichi Nuclear Power Station (PDF 23.1KB)
Result of the sampling regarding the water leakage in the area of the concentrated water storage tanks of water desalinations (reverse osmosis membrane) in Fukushima Daiichi Nuclear Power Station (PDF 17.1KB)