In April 1975, the reactor building was reopened to the public as a museum.
Officials said contaminated ground water near the reactor building would take 20 years to reach the fence.
The walls of the reactor 4 building have also collapsed.
On 5 May 2011, workers were able to enter reactor buildings for the first time since the accident.
They said no radiation above normal background levels remained inside the reactor building.
Finally, there would remain a central core containing the reactor building itself.
Dealing with the more heavily contaminated water near the reactor building will be an even greater problem, officials said.
Maybe several plane deliberately crashing on top of the reactor building?
Eventually, it will make its way into the reactor building.
However, this water is in the basement of the reactor building.