a refueling outage. Emergency diesel generators, water pumps and feed water were functioning following a loss of all off-site power on Unit One, according to the NRC event notification. The plant was placed under an "unusual event classification", which is the lowest of four emergency classification levels for abnormal events designated by the federal Nuclear Regulatory Commission, which regulates American civil nuclear installations. One plant worker died, and ten other injuries required offsite medical treatment. The company released an official statement of condolence. Entergy announced that they would immediately commence repairs to Unit Two and hope to have the unit back online within several weeks. Entergy also acknowledged that Unit One would be offline for an extended time while the company surveyed the damage and established a timeline for repairs. The cost of the repairs was estimated at $95–120M, not counting additional costs to replace lost electricity from the reactors being down for four months. Both units were repaired, and started up on August 7, 2013 capable of returning to full power. During the recovery from the incident a specialist engineering company named Lowther-Rolton assisted with the recovery of the existing Stator and performed a "Technical Audit" (also called a "third-party review") of the engineering for lifting and installation of the new Stator to ensure safety of operations. December 2013 incident On December 9, 2013, Unit Two was taken offline due to a transformer fire in the site switchyard. The fire was contained without injuries or threats to safety. See also List of power stations in Arkansas References External links Entergy Nuclear - Arkansas Nuclear One Arkansas Nuclear One, United States of America NukeWorker History Energy infrastructure completed in 1974 Energy infrastructure completed in 1978 Buildings and structures in Pope County, Arkansas Nuclear power plants in Arkansas Nuclear power stations using pressurized water reactors Entergy Industrial fires and explosions in the United States 2013 disasters in the United States 1974 establishments in Arkansas