On May 13, the Nuclear Regulation Authority announced that the nuclear fuel reprocessing plant in Rokkasho, Aomori Prefecture, had met new safety standards created after the March 11, 2011, earthquake and tsunami.

The NRA’s approval means the long-troubled and controversial plant has moved closer to going into operation. Here’s a look at the Rokkasho plant and the problems it has faced.

What is the Rokkasho reprocessing plant?