There is currently great amount of radioactive waste water in the turbine 
buildings of the Fukushima Daiichi Nuclear Power Station and especially 
the turbine building of Unit 2 has extremely high level radioactive waste 
water.

We think it is necessary to transfer the radioactive waste water to the 
Central Radioactive Waste Disposal Facility in order to store it in a 
stable condition. However, ten thousand of low level radioactive waste 
water has been already stored and we have to discharge the existing low 
level radioactive waste water to receive new liquids. 

In addition, as low radioactive subsurface water is piling up in sub-drain 
pits of Unit 5 and 6 and a part of subsurface water is running into 
buildings, we are concerned that important equipment to secure the safety 
of reactors will be submerged. 

Based on the Section 1 of the Article 64 of the Nuclear Reactor Regulation 
Law, we have decided to discharge to the sea approximately ten thousand 
tons of the accumulated low level radioactive water and a total of 1,500 
tons of the low level radioactive subsurface water stored in the sub drain 
pits of Unit 5 and 6 as soon as we get ready.

We evaluate approximately 0.6 mSv of effective radioactive doses per year 
for adults as the impact on the discharge of the low radioactive waste 
water to the sea if they eat adjacent fish and seaweeds every day. The 
amount (0.6 mSv of effective radioactive doses per year) is one-forth of 
annual radioactive dose to which the general public is exposed in nature.