On March 28th 2011, we received advice from Nuclear Safety Commission of 
Japan to conduct sampling survey of the water on the first basement of 
turbine building of Fukushima Daiichi Nuclear Power Station as well as to 
reinforce the sampling survey of seawater in order to secure safety and to 
monitor the leakage of the water on the basement into underground and/ or 
sea. 

On March 30th, 2011, we conducted nuclide analysis of radioactive 
materials, the sample of which was collected from the water on 1st 
basement (sub drain) of turbine building at the site of Fukushima Daiichi 
Nuclear Power Station. Because radioactive materials were detected as a 
result, as shown in the attachment, we reported the result to Nuclear and 
Industry Safety Agency as well as to the government of Fukushima 
Prefecture today. 

Appendix:Fukushima Daiichi Nuclear Power Station: the result of 
         measurement of sub drain(PDF 11.2KB)