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

Regarding sampling surveys of sub-drains, per the instruction from Nuclear 
and Industry Safety Agency (NISA) on April 14th, we will continue the same 
kind of sampling surveys three times a week, and inform the result on the 
next day of the survey.
                                                    (Previously announced)

As a result of Nuclide analysis from the sample regarding sub-drains 
(subsurface water obtained and managed in the site) near the turbine 
buildings of Fukushima Daiichi Nuclear Power Station collected on July 20, 
radioactive materials were detected as shown in the attachment and today, 
we reported to NISA and the government of Fukushima Prefecture. 

Appendix1: Results of Nuclide Analysis of Sub-drains (PDF 10.6KB) 
Appendix2: Radioactivity Density of Sub-drain (PDF 24.2KB)