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 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 11, Plutonium 
were not detected as shown in the attachment.  

Attachment: Fukushima Diichi Nuclear Power Station Result of Pu Analysis in 
            Sub Drain(PDF 7.98KB)