The U.S. Nuclear Regulatory Commission is conducting a second special inspection within two months at Palisades Nuclear Power Plant in South Haven.
NRC inspectors were at the 40-year-old Palisades plant in August after a water pump part failed, leading to a plant shutdown.
The team is back in South Haven, after workers performing maintenance on an electrical panel caused the plant to shut down again on Sunday.
“Did it involve maintenance issues, human performance issues, design concerns? What happened? Why did the plant trip after that electrical arc?"
Those are some of the the questions the inspectors will ask, according to NRC spokeswoman Victoria Midlyng.
The inspection could take up to two weeks.
Palisades spokesman Mark Savage says the plant and its owner, Entergy, are conducting their own investigations. He says employees and the public were never in danger.