When a nuclear power plant completes these days it must feel weird – almost no-one has managed it outside of China in the past decade, and it is usually after a ten year build plus a 3 or 4 year overrun at best, and at least 10% to 15% cost overruns. So this week when Southern Company said that engineering firm Bechtel had set in place its passive containment cool water tank, there was an audible gasp from the investor community, unsure if perhaps we are approaching the point where the Vogtle 3 and 4 units being built for Georgia Power, the Southern subsidiary, were approaching their final end dates. But such is the constant theme around nuclear that a…