TEPCO : Press Release | Out flow of fluid containing radioactive materials to the ocean from areas near intake canal of Fukushima Daiichi Nuclear Power Station Unit 2 (continued report 4)

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Press Release (Apr 08,2011)
Out flow of fluid containing radioactive materials to the ocean from areas near intake canal of Fukushima Daiichi Nuclear Power Station Unit 2 (continued report 4)

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. (Reported on April 
2nd already)

Today at 5:38 am, 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 7th), 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 Statio(PDF 49.4KB) 
Appendix:Radioactivity density of seawater near the quay of Fukushima 
         Daiichi Nuclear Power Station (PDF 13.4KB)