The utility running the plant has opened part of the facility to the media.
The Tokyo Electric Power Company said the plant has been stabilized and it's now safe for workers.
The safety of the workers has been a major concern since the crisis began on March 11, when the a huge tsunami touched off meltdowns and explosions.
TEPCO said the plant is stable enough to allow up to 3,300 workers onto the facility each day. Over the past several months, they have restored its cooling systems to keep the reactors at a fairly low and constant temperature, repaired damaged buildings and machinery and conducted decontamination tasks.
However, the company said it could take three decades or more to safely decommission the plant.
TEPCO has acknowledged it was not sufficiently prepared for the nuclear crisis, the worst since Chernobyl in 1986.
The Associated Press contributed to this story