The Nuclear Regulatory Commission has sent a special investigation team to Entergy’s Palisades nuclear power plant to examine the circumstances around the plant’s latest unplanned shutdown. Palisades 798 MW pressurized water reactor, located about 70 miles southwest of Grand Rapids on Lake Michigan, abruptly powered down on Sunday night when an electrical malfunction took out the power supply to several safety-related valves and switches. “The issue involved plant workers who were performing maintenance activities on an electrical panel when a small metal piece located inside the breaker panel came into contact with another metal piece and caused an arc,” the NRC said Wednesday.