They are proceeding swimmingly, as though high stresses didn't exist. I am happy for them. This is a picture of the overbreak-fixing carrier. Then they go through with the slip form for the arch, and then they have 2 grout injection passes, to make sure everything is nice and tight. In the old days, we would have had a crushable zone, but what the hey.
I'm sure this will last the full 20 years before it cracks up, which is the same for a badly maintained new nuclear plant. Then everybody is happy fixing it up again! :)
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