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.

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.

Since April 5th we have been conducting sampling of seawater in the pit 
and in front of the bar screen near the pit. 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 (NISA) on 
April 1st.
                                                       (Already announced)

On April 12th, 2011, we collected samples from seawater in the pit and in 
front of the bar screen near the pit. As a result of the nuclide analysis, 
radioactive materials were detected as described in the exhibit. 
Accordingly, we have reported the result of analysis to NISA and Fukushima 
Prefecture.

Please note that the sampling point was changed from in front of the bar 
screen of Unit 4 to the north and south sides of the water intake canal of 
Unit 1-4 due to the installation of the silt fence.
  
* pit: a shaft made of concrete 

Appendix: Result of Nuclide Analysis of the seawater at the shallow draft quay, 
          Unit 2 screen and the water intake canal of Unit 1-4 (PDF 10.4KB) 
 
Appendix: Radioactivity density of seawater near the quay of Fukushima 
          Daiichi Nuclear Power Station (PDF 13.7KB)