On April 15, 2011, we received an instruction document* from Nuclear and 
Industrial Safety Agency ("NISA"), Ministry of Economy, Trade and Industry,
on "Discharge of drained water with concentrations of radioactive materials
exceeding the discharge standard to the ocean." 
                                    (Already announced on April 16th, 2011)

In response to this instruction, we have implemented the evaluation about 
the impact based on the actual discharge amount and the result of 
monitoring for the combination of following report;
 - Discharge of low level radioactive accumulated water from the Central 
   Radioactive Waste Disposal Facility etc. to the ocean 
                                     (Already announced on April 4th, 2011)
 - Out flow of fluid containing radioactive materials to the ocean from 
   areas near intake channel of Unit 2 
                     (Already announced on April 2nd, 5th, 6th, 21st, 2011)
 - Out flow of fluid containing radioactive materials to the ocean from 
   areas near intake channel of Unit 3 
                     (Already announced on April 2nd, 5th, 6th, 21st, 2011)
We notify here that we submitted the report to NISA yesterday. 

 
Attachment:  
 Report regarding the impact due to the discharge of drained water with 
 concentrations of radioactive materials exceeding discharge standard to 
 the ocean (summary) (PDF 99.0KB) 

*Instruction document
"Discharge of drained water with concentrations of radioactive materials 
exceeding the discharge standard to the ocean (Instruction)"
                                              (NISA no.5 on April 15, 2011)
 
Nuclear and Industrial Safety Agency (hereinafter called "NISA") received 
a report on above mentioned subject from TEPCO on April 15. We inspect it 
and conclude that, because we have not find any significant changes in 
monitoring data before and after the discharge, but we have to consider 
the leakage of water with highly concentrated radioactive materials from 
the Fukushima Daiichi Nuclear Power Station, we also need to continue 
scrutinizing its impact.
Therefore, NISA considers that we need to continue conducting the 
monitoring and environmental impact assessment regarding the leakage of 
the water with highly concentrated radioactive materials as well as the 
discharge to the ocean and instructs TEPCO to implement following 
measures. NISA will accordingly confirm monitoring results.
 
1. Regarding the impact due to the discharge to the ocean, TEPCO should 
conduct detailed evaluation including the impact of ocean currents based 
on the actual data of discharged volume and the monitoring results and 
submit the evaluation result by May 2nd, 2011.
 
2. In order to understand impacts in broader areas and on a longer term 
basis, TEPCO should increase the number of monitoring points, conduct 
monitoring and periodically announce results.
 
3. TEPCO should catch or collect the fish and shell fish in the 
surrounding ocean area of the Fukushima Daiichi Nuclear Power Station, 
measure radioactive dose, evaluate impacts and periodically announce 
results. 

Reference: Measurement result of radioactivity concentration in the ocean 
           monitoring sea water around Fukushima Daiichi Nuclear Power 
           Station (PDF 99.0KB)