Vogtle Unit 4 shield building roof set Building provides protection for the containment vessel that houses the reactor Hot Functional Testing last major test remaining for Unit 3 ahead of fuel load News provided by Share this article Share this article ATLANTA, Dec. 11, 2020 /PRNewswire/ -- The two-million-pound roof of the Vogtle Unit 4 shield building has been set into place at Georgia Power's nuclear expansion project near Waynesboro, Georgia. With this placement, there is now one last major crane lift remaining for Vogtle Unit 4, the CB-20 module, which is part of the AP1000 reactor's advanced passive safety system. The Vogtle Unit 4 shield building roof placement comes just days after the receipt of the first nuclear fuel shipment for Vogtle Unit 3, representing the first nuclear fuel shipment for the AP1000 reactor in the U.S.