Honeywell officials are awaiting the Nuclear Regulatory Commission's final approval before resuming normal operations at the Metropolis plant.
In a letter to employees, Plant Manager Larry Smith says the plant should be ready to resume work this month once an undated final inspection confirms the plant meets safety standards.
Communications Director John McCarthy says the facility has 15 unfilled positions, putting the total employment at 270.
Last year, Honeywell laid off more than 220 workers after the N-R-C found that plants nationwide had failed to support structures with proper braces, leaving some facilities vulnerable to an earthquake or tornado.
The Honeywell Plant refines uranium into hexafluoride (HF6), which is used as fuel at nuclear power plants.