TOKYO (AP) — The operator of the tsunami-wrecked Fukushima Daiichi nuclear power plant said on Monday that it has obtained permission from safety regulators to start loading atomic fuel into a reactor at its only operable plant in north-central Japan, which it is keen to restart for the first time since the 2011 disaster.

Tokyo Electric Power Company Holdings, or TEPCO, said that it obtained the Nuclear Regulation Authority’s approval to load nuclear fuel into the No. 7 reactor at its Kashiwazaki-Kariwa nuclear power plant in Niigata and it was to start the process later Monday. The loading of the 872 sets of fuel assemblies is expected to take a few weeks.

The Kashiwazaki-Kariwa plant, which is the world’s biggest, has been offline since 2012 as part of nationwide reactor shutdowns in response to the March 2011 triple meltdowns at the Fukushima Daiichi plant.