During the patrol of our private port approximately at 8:00 am on May 31st,
2011, a TEPCO employee confirmed oil leakage to the sea around the
curtain wall of the water intake canal of Unit 5 and 6, Fukushima Daiichi
Nuclear Power Station. We reported the issue to Futaba Wide-area Fire
Headquarters and Fukushima Coastguard Office.
While the amount of the oil and the area are still being confirmed, we are
preparing oil fences to prevent the wide-spread of the oil to the outer
The cause of the leakage is under investigation in detail, taking into
account the possibility that the tanks and pipes for heavy oil became
damaged due to the earthquake on March 11th, when we were supplying heavy
oil to the two heavy oil tanks of Unit 5 and 6 (capacity: 960 kiloliter
As a result of investigation, it was confirmed that the pipes inside sea
bank is stained with oil and the oil is leaking through the hole of steel
sheet of sea bank and it was also confirmed that the leak is stopping now.
The area where the oil, which is confirmed very thin oil film, is spread
out is to the sea surface around curtain wall and loading area, and we
also confirmed that there is no spread out to the open ocean. Accordingly,
at around 2:00 pm we complete installation of adsorption mattress around
the sea bank area and installment of oil fence at 2:50 pm.
We will conduct reinforcement work around pipes inside sea bank and
recover spilt oil from the sea surface.