The 6-foot-thick basemat, which provides a foundation for the containment building, required 7,000 cubic yards of concrete and was the first new construction nuclear concrete to be poured in the U.S. in three decades, the company said.
A similar pour will occur later this week at Southern Nuclear’s Plant Vogtle in Burke County, a Georgia Power Co. spokesman said.
Both sites are operating under the first and second “combined operating licenses” issued by the U.S. Nuclear Regulatory Commission, and both sites are building nearly identical Westinghouse AP1000 reactors.
Although the Vogtle site was licensed before the Summer project, and had been scheduled for completion ahead of the South Carolina project, the closeness of basemat construction shows the two projects are on similar schedules.
Under the most recent schedule presented to the Georgia Public Service Commission last month, Vogtle’s units 3 and 4 are expected to begin commercial operation during the fourth quarter of 2017 and 2018, respectively. Previous schedules called for completion in November 2016 and November 2017.
The V.C. Summer units are also scheduled to start generating electricity in 2017 and 2018, respectively, the company said.