There are at least three potential bottlenecks for deployment of enough plants to save our world economy and civilization itself--concrete, staffing and ultralarge forgings for the reactor vessels. Reactor containment structures will have to compete for concrete with the footings for millions of wind turbines. Concrete, currently in short supply, can probably ramp up. However, this will add to emissions; concrete production causes 4% of the world's CO2 right now. Nuclear staffing will be a race of long lead times for plants vs. retirement of industry old timers.
The most critical looming shortage is massive forgings for reactor vessels; and The Japan Steel Company, is the only one in the world that can do this work. Since 31 nuke plants are in the worldwide pipeline now, and Japan Steel has a 3.5 year backlog; will they be able to handle demand from 70 nations in coming decades? Last month, two American companies announced that they had placed orders for vessels even though they do not yet have licenses; a gamble they felt was necessary. Its past time, for some American company like GE, or foreign facility such as ThyssenKrupp to see the enormous business potential, and build a second plant for the world--before it is too late.