The Palisades nuclear power plant is shut down. Officials at the plant removed it from service due to what is being described as a "small leak" in the plant's safety injection and refueling water tank. That tank holds as much as 300-thousand gallons of water that is used remove heat from the reactor's core in the event of a coolant accident and to increase "shutdown safety margin." It's not known how long the troubled facility will remain out of service. Palisades has been ranked by the Nuclear Regulatory Commission as one of the four worst nuclear plants in the nation.