Tokyo Electric Power Company Holdings Inc. plans to restart a reactor at a nuclear power plant in Niigata Prefecture, northwest of Tokyo, as early as Monday, after it was halted over an alarm incident, a source close to the matter said Thursday.Last month, the utility brought its first nuclear unit back online since the 2011 Fukushima disaster, but the operation of the No. 6 reactor at the seven-unit Kashiwazaki-Kariwa plant was suspended after an alarm went off during control rod withdrawal about five hours and 25 minutes later.The utility believes a setup error triggered the alarm, accord…READ FULL ARTICLE