On March 28th, 2011, we were advised from Nuclear Safety Commission of 
Japan to enhance the sampling survey regarding water in underground floor 
of the turbine building of Fukushima Daiichi Nuclear Power Station. In 
order to verify any leakages to underground and sea, and safety, we have 
been implementing the sampling survey of subsurface water and seawater.
                                                    (Previously announced)

On April 16th, 2011, we had conducted sampling survey regarding subsurface
water (sub-drain) near the turbine building of Fukushima Daiichi Nuclear 
Power Station. Today, we had informed the result to Nuclear and Industrial
Safety Agency (NISA) and the government of Fukushima Prefecture, because 
radioactive materials were detected as shown in the attachment.

Regarding sampling survey of sub-drain, based on the instruction from NISA
on April 14th, we continue to conduct same kind of sampling survey three 
times a week, and inform the result on the next day of the survey. 

Appendix1: Fukushima Daiichi Nuclear Power Station :Results of Nuclide 
           Analysis of sub-drain (PDF 38.6KB) 
Appendix2: Fukushima Daiichi Nuclear Power Station :Radioactivity Density 
                                                              (PDF 38.6KB) 
Reference: [Figure]Sub-Drain and Deep Well (PDF 765KB)