The Nuclear Regulatory Commission says failures by Entergy Corp. led to an accident at the utility's Arkansas Nuclear One plant that killed one worker and injured eight others.
On March 31, 2013, 24-year-old Wade Walters died when a 525-ton piece of equipment fell 30 feet to the floor of the plant.
The commission said Tuesday that the collapse resulted from Entergy's failure to adequately review the assembly design and do a load test before trying to lift the turbine generator stator.
According the Arkansas Democrat-Gazette, the commission says it will determine an appropriate level of agency oversight.
Entergy says the company takes the NRC's findings "very seriously" and that it's committed to working with the industry to make sure something similar never happens again.