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 
sea.

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 heaviy oil tanks of Unit 5 and 6 (capacity: 960 kiloliter 
for each).

Appendix: Layout of Fukushima Daiichi Nuclear Power Station(PDF 18.9KB)