On Monday, Georgia Power announced that the Vogtle nuclear reactor Unit 3 has started a nuclear reaction inside the nuclear reactor. Technically, this is called “initial criticality” and is when the nuclear fission process has started splitting atoms, generating heat. Vogtle’s Unit 3 reactor will be fully in service in May or June, Georgia Power said. The last time a nuclear reactor reached the same milestone was almost seven years ago when the Tennessee Valley Authority started splitting atoms at the Watts Bar Unit 2 reactor in Tennessee, according to the Nuclear Regulatory Commission. “This is a truly exciting time...