At around 9:30 am on April 2nd, we detected water containing radiation 
dose over 1,000 mSv/h in the pit* where supply cables are stored near 
the intake channel of Unit 2. Furthermore, there was a crack about 20 
cm on the concrete lateral of the pit, from where the water in the pit 
was out flowing. At around 12:20 pm on April 2nd, we reaffirmed the 
event at the scene.
We have implemented sampling of the water in the pit, together with the 
seawater in front of the bar screen near the pit. These samples were sent 
to Fukushima Daini Nuclear Power Station for analysis. 
                                 (We already informed on April 2nd, 2011)

We also injected fresh concrete to the pit on April 2nd, but we could 
not observe a reduction in the amount of water spilling from the pit to 
the sea. Therefore, we started to inject the polymer (April 3rd). 

From 7:08 am to 7:11 am on April 4th, we put the tracer into the pit 
and began an investigation of water flows. Additional tracer was put 
through the two new holes drilled near the pit. At 2:15 pm, April 5th, 
it was observed the water with tracer came out from the crack on the 
concrete lateral of the pit. At 3:07 pm, April 5th, injection of 
coagulant from the holes was initiated. 
                                 (We already informed on April 5th, 2011)

At 5:38 am on April 6th, we observed the stoppage of the water spilling 
from the crack on the concrete lateral of the pit. Details of the 
situation will be announced after checking the blockage of the water 
flows.

We will continue the countermeasure in order to prevent further outflow 
of high level radioactive materials to the ocean.

*pit: a shaft made of concrete