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.

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.
                                                    (Previously announced)

On April 20th 2011, we had conducted sampling survey regarding sub-drain 
(subsurface water obtained and managed in the site) 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. 

attachment1:Results of Nuclide Analysis of Sub-drain(PDF 51.7KB) 
attachment2:Radioactivity Density of Seawater(PDF 46.8KB)