A team from the Nuclear Regulatory Commission has begun a special inspection of the Palisades nuclear power plant in southwestern Michigan.
The inspectors will be following up on two incidents in 2011 that caused the plant's safety rating to be downgraded, making it among the nation's poorest performing nuclear plants.
One problem was an electrical fault that caused a reactor shutdown and the other was failure of a water pump that cools safety equipment.
NRC spokeswoman Prema Chandrathil said Monday the eight-member inspector team began work Monday and will remain at Palisades for about two weeks.
They'll be determining whether problem areas have been fixed and examining the plant's safety culture.
Afterward, they'll prepare a report that will determine whether Palisades' rating will go up, down or stay the same.