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Small-Scale Question Sunday for December 7, 2025

Do you have a dumb question that you're kind of embarrassed to ask in the main thread? Is there something you're just not sure about?

This is your opportunity to ask questions. No question too simple or too silly.

Culture war topics are accepted, and proposals for a better intro post are appreciated.

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China actually started up a molten salt 'thorium' (eg, starting with uranium, then moving to thorium) reactor last year, with the first full thorium cycle this November. I'm not optimistic about its effectiveness, but that's more because it's a lot more complicated than it needs to be, rather than net energy or net cost problems.

A lot of the various cost problems with nuclear plants reflect political willpower, rather than actual material costs. That's most serious in the United States where we've intentionally made them several times harder to produce at the same time that the control and construction technology has gotten much much better, but most western governments have done something similar. (or just had politicians launch rockets directly at the construction sites.)

There's a revealed preferences sense where, if you can't solve those political problems, you can't produce power at price, and it's not entirely wrong. But it's misleading to treat it as a physics problem.