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 .
NEW : Experts say the release will not likely cause lasting environmental harm . Water from a treatment facility and around four reactors is being dumped . The official calls the step `` unavoidable , '' saying it 's needed to ensure safety . Basement water threatens the `` stability '' of the cooling systems of Nos . 5 and 6 units .