The government on Friday finalized a hastily drafted set of additional safety criteria for reactor restarts that it says reflects the lessons of the Fukushima disaster.

In a nutshell, the new criteria require utilities to make sure their plants are sturdy enough to avoid meltdowns and the release of radioactive material even if they are hit by quakes and tsunami on a par with those of March 2011. They also must show they are committed to continuous efforts to improve safety by drafting a road map toward that task.

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