The government's plan to allow nuclear reactors to operate as long as 60 years has shocked antinuclear experts and activists, who warn of a Fukushima sequel.

The central government announced its plan Tuesday, the 17th anniversary of the Great Hanshin Earthquake in Kobe. Under the proposal, once a reactor hits its 40th year, its operator could apply for a one-time extension of up to 20 years under certain conditions.

The proposal, which needs Diet approval, is similar to a law recently passed in the U.S. allowing 40-year-old reactors to apply for up to 20-year extensions.