NEW But most of the dumped water -- 10,000 tons -- will come from the plant 's central waste treatment facility , which will then be used to store highly radioactive water from the No . 2 unit , an official with the power company said . : Experts say the release will not likely cause lasting environmental harm . Water from a treatment plant and around four reactors is being released . The official calls the step ` ` unavoidable , '' saying it 's needed to ensure safety . Basement water threatens the ` ` ' '' of the cooling systems of Nos . 5 and 6 units .
NEW : Experts say the release will not likely cause lasting environmental harm . Water from a treatment plant and around four reactors is being released . The official calls the step ` ` unavoidable , '' saying it 's needed to ensure safety . Basement water threatens the ` ` ' '' of the cooling systems of Nos . 5 and 6 units .