An official in charge of the wrecked Fukushima nuclear power plant says the upcoming release of treated radioactive water into the sea more than 12 years after the reactors' meltdown marks “a milestone,” but is still only an initial step in a daunting decades-long decommissioning process.

An official in charge of the wrecked Fukushima nuclear power plant says the upcoming release of treated radioactive water into the sea more than 12 years after the reactors’ meltdown marks “a milestone,” but is still only an initial step in a daunting decades-long decommissioning process.