Southern Co. says the license amendment request is necessary because it involves a change in the design basis for the new AP1000 reactor.
Southern Co. wants to amend its Plant Vogtle construction license after unforeseen settling of soil beneath the foundation for its new Unit 3 reactor created an uneven surface.
In a letter to the U.S. Nuclear regulatory Commission, dated March 30 and recently made public, the company said the concrete “mudmat” that lies atop compacted, load-bearing soil “is not as level as expected.”
The current license allows only a 1-inch variability in the levelness of the basemat, and the amendment would increase that leeway to 4 inches and allow engineers to use more concrete when the basemat is poured to ensure a level surface for the “nuclear island” buildings.
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Source: Rob Pavey | The Augusta Chronicle
Image: U.S. Nuclear Regulatory Commission