Currently there is much high level radioactive waste water in the turbine 
buildings of Fukushima Daiichi Nuclear Power Station. On April 10th, from 
the Minister of Economy, Trade and Industry, we received an order of 
submission of a report regarding necessity and safety assessment on 
transfer of high level radioactive water in Fukushima Daiichi Nuclear 
Power Station to the Centralized Radiation Waste Treatment Facility, and 
a principle for a permanent storage method and treatment facilities. 
                                (previously announced on April 15th, 2011)

On April 18th, a leakage block measure, etc. for the Process Main Building 
in the Centralized Radiation Waste Treatment Facility was completed. Based 
on the above order, we compiled the results and reported to the Minister 
of Economy, Trade and Industry. The contents of the report were confirmed 
by the Nuclear and Industrial Safety Agency.
                                (previously announced on April 19th, 2011)

Since April 19th, we have continuously conducted a transfer of high level 
radioactive water from the turbine building of Unit 2 to the Process Main 
Building of the Centralized Radiation Waste Treatment Facility. 

After that, because the water level of the radioactive waste water in the 
turbine building of Unit 3 has increased, we have conducted a leakage 
block work for the Miscellaneous Solid Waste Volume Reduction Treatment 
Building of the Centralized Radiation Waste Treatment Facility to secure 
a temporary storage space.
On May 16th, because we completed the leakage block work, etc. we compiled 
the results based on the above order and reported to the Minister of 
Economy, Trade and Industry. The contents of the report were confirmed by 
the Nuclear and Industrial Safety Agency. Thus we started to transfer the 
high level radioactive waste water from the turbine building of Unit 3 to 
the Centralized Radiation Waste Treatment Facility. 
                                  (previously announced on May 16th, 2011)

After that, we had transferred the radio active waste water to the Process 
Main Building and the Miscellaneous Solid Waste Volume Reduction Treatment 
Building. However, because the water storage in the Process Main Building 
was almost full and we found there was a possibility to leak to the nearby 
underground passage in the Miscellaneous Solid Waste Volume Reduction 
Treatment Building, we interrupted the transfer work.  
Under these circumstances, the water level in the turbine buildings of 
Unit 2 and Unit 3 has increased. In order to prevent a leakage to the 
outside system, we reviewed the water storage level of the Process Main 
Building and reported to the Nuclear and Industrial Safety Agency. 
                                  (previously announced on June 4th, 2011)

We started a transfer of water in the turbine building of Unit 2 to the 
main process building since 6:39 PM on June 4th, and a transfer of water 
in the turbine building of Unit 3 to the surface condenser of Unit 3 since 
6:26 PM on June 5th.  
This time, in order to reduce risks of leakage of water in the turbine 
buildings of Unit 2 and Unit 3 to the outside system, we reviewed the 
water storage level of the Process Main Building and reported to the 
Nuclear and Industrial Safety Agency.
                                  (previously announced on June 8th, 2011)

We stopped the transfer of water in the turbine building of Unit 2 to the 
Process Main Building at 8:40 AM on June 16th. 
We also stopped the transfer of water in the turbine building of Unit 3 to 
the surface condenser of Unit 3 because the water volume reached its full 
capacity at 10:44 AM on June 9th. After that, we started a transfer of the 
water to the Process Main Building at 10:05 Am on June 14th and stopped 
the transfer at 8:46 AM on June 16th.
This time, in order to reduce risks of leakage of water in the turbine 
buildings of Unit 2 and Unit 3 to the outside system, we conducted an 
evaluation for risks of water leakage from nearby underground passage which 
had a possibility to leak to underground water, caused by re-start of water 
transfer to the Miscellaneous Solid Waste Volume Reduction Treatment (High 
Temperature Incinerator Building). (The water transfer to the Miscellaneous 
Solid Waste Volume Reduction Treatment has been interrupted since May 25th.) 
We compiled the results and reported to the Nuclear and Industrial Safety 
Agency. 

 
attachment1: Evaluation for re-start of water transfer to the High 
             Temperature Incinerator Building which a water leakage was 
             found (summary)(PDF 19.6KB)  
attachment2: Change of Water Level in the High Temperature Incinerator 
             Building (HTIB)(PDF 15.9KB)  
attachment3: Monitoring Points of Radioactivity and Water Level of 
             Sub-drain Water(PDF 19.9KB)  
attachment4: Correlation among Sub-drain Water Level, Radioactivity and 
             Rainfall(PDF 20.0KB)