There are but a very few forges in the world which can make the unwelded containment vessels, i think. Current capacity was a half dozen a year, again, off the top of my head.

China and South Korea could indeed build more forges and ramp up the supply chain within five years. Then we'd be back to the original  blindness that the answer is staring us in the face, but we refuse to see it.

A healthy civilization would want its energy directly from the sun, distributed throughout society, period. Not with 400 million years of poison added on, not with ersatz suns created by a military-technical elite, not with the danger of a "whoops" hanging around for a few thousand years.

But what do eye know?

"Life shrinks or expands in proportion to one's courage." - Anaïs Nin