At around 9:30 am on April 2nd, we detected water containing radiation 
dose over 1,000 mSv/h in the pit* where power supply cables are stored 
near the intake channel of Unit 2. Furthermore, there was a crack of 
about 20 cm length on the concrete lateral of the pit, from where the 
water in the pit was out flowing. At around 0:20 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. (Reported 
on April 2nd already)

At around 5:38 am on April 6th, we have observed stoppage of spilling 
of water from the crack on the concrete lateral of the pit. For the 
sake of completeness, we put further reinforcement for the stoppage of 
leakage and consider countermeasure including continuous injection of 
coagulant. We will also note the water level of turbine building of 
unit 2 remain unchanged. We will further investigate if there is any 
other leakage. (Reported on April 6th already)

We have been conducting sampling of seawater in front of the bar 
screen near the pit. In regard to the sample collected yesterday 
(April 11th), as a result of conducting nuclide analysis, radioactive 
materials were detected as described in the exhibit. Accordingly, we 
have reported the result of analysis to Nuclear and Industrial Safety 
Agency and Fukushima Prefecture.

Regarding the results on three nuclides (iodine 131, cesium 134, 
cesium 137), we would like to assume those as definite result, 
however, as for other nuclides, we will revaluate in accordance with 
the preventive measures formulated after being given warning from 
Nuclear and Industrial Safety Agency on April 1st.

* pit: a shaft made of concrete 

Appendix: The result of nuclide analysis of the seawater at the front of 
          shallow draft quay and the screens of Unit 2 and 4 of the 
          Fukushima Daiichi Nuclear Power Station (PDF 15.2KB) 
Appendix: Radioactivity density of seawater near the quay of Fukushima 
          Daiichi Nuclear Power Station (PDF 10.4KB)