by credit_guy
7 subcomments
- Before anybody gets too excited, it's better to understand what exactly happened.
China ran an experimental reactor that achieved some conversion of thorium into uranium. More precisely, the conversion ratio was 0.1 [1]. This means that for each new fissile atom generated from thorium (i.e. uranium-233) 10 atoms have been burned from the original fissile inventory.
Now, conversion happens in every nuclear reactor. Some new fissile material (generally Pu-239) is generated out of "fertile material" (generally U-238). And, surprisingly, that conversion ratio is quite high: 0.6 for pressurized light water reactors and 0.8 for pressurized heavy water reactors [2].
What China has achieved therefore is well below what is business as usual in regular reactors. The only novelty is that the breeding used thorium, rather than uranium.
Is this useless? No, it is not. In principle increasing the conversion ratio from 0.1 to something higher than 1.0 should be doable. But then, going from 0.8 in heavy water reactors to more than 1.0 should be even easier. Why don't people do it already? Because the investment needed to do all the research is quite significant, and the profits that can be derived from that are quite uncertain and overall the risk adjusted return on investment is not justified. If you are a state, you can ignore that. If China continues the research in thorium breeding, and eventually an economically profitable thorium breeder reactor comes out of that, the entire world will benefit. But the best case scenario is that this would be three decades in the future.
[1] https://www.world-nuclear-news.org/articles/chinese-msr-achi...
[2] https://en.wikipedia.org/wiki/Breeder_reactor#Conversion_rat...
by HPsquared
3 subcomments
- The notable thing here is that it's a molten salt reactor design, where the fuel is dissolved in a molten salt (FLiBe). This allows online continuous processing of the fuel, unlike with solid fuel rods sealed inside a pressure vessel.
This unlocks a lot of options for the fuel cycle, including the use of thorium.
This work builds on a previous molten salt reactor experiment at Oak Ridge, decades ago. There's a whole lore about MSRs.
- A better explanation of the significance:
https://www.stdaily.com/web/English/2025-11/17/content_43298...
by StarterPro
1 subcomments
- Every other day its "China creates a breakthrough that was never thought possible" and "America shits in hand; Claps."
by perihelions
1 subcomments
- This post is just an excerpt—it's the first 4 paragraphs of a 29-paragraph article,
https://archive.is/DQpXM ("China reaches energy independence milestone by ‘breeding’ uranium from thorium"–SCMP)
by _trampeltier
7 subcomments
- This came up several times the last few weeks, but never stayed on the front for long. Also no comments.
I guess soon the west has to copy chinas tech.
by throwawaymaths
0 subcomment
- also to remember that thorium is the dominant radioactive byproduct of "rare" earth metal refinement; so they're probably isolating large amounts of it so might as well figure out something to do with it.
by jonplackett
6 subcomments
- I think I read recently that this was a US idea that was abandoned that China took up and made it work. Is that accurate?
- Interesting claim that the reactor doesn't need water and can be built away from the coast. I thought all reactors used steam to turn a turbine to produce electricity. Something special here?
- its easy to put china's perspective on expansion of nuclear when you look at how much is planned/being built vs how much is planned/being built for coal/gas vs projected demand...
by SilverElfin
3 subcomments
- This type of progress shows China is capable of moving from an economy that’s build on labor arbitrage or copying others to genuine innovation. It’s also further evidence of the extreme competence of the CCP in governance, which I feel should be acknowledged despite their authoritarian negatives.
- Honest question
Is SCMP a real media outlet?
- China is far better at long term societal planning. Ultimately, I expect they will be the ones who can solve the climate crisis, after being one of the biggest contributors to the problem.
- Thorium is abundant in Sri Lanka’s mineral sands. Mined with dredgers at shallow depths 10-100m off the western coast.
- Meanwhile Germany just decommissioned its last nuclear reactors. Given the challenges of baseload renewable generation, it's frustrating to watch working infrastructure being dismantled while we're still heavily dependent on fossil fuels.
- A detailed explanation of the Thorium Fuel Cycle [1].
I'm glad China is doing this even though I'm skeptical about nuclear power ever being commercially viable. At least they're trying different things.
[1]: https://www.youtube.com/watch?v=2IqcRl849R0
by DeathArrow
1 subcomments
- I wonder if people would think China copied this from the West.
by Hikikomori
1 subcomments
- There's a danish company building modular container sized molten salt reactors.
https://www.copenhagenatomics.com/
by yanhangyhy
0 subcomment
- shit, people in china are focusing on japan and didn't talk about this much
- [flagged]
- We have basically limitless carbon free energy with the tech we have now: solar, wind, batteries, fission breeders, large power grids that can move power around cheaply, etc. Put all those together and we have incredible energy abundance.
We also have the ability to electrify most transport except maybe long haul trucking and long haul aviation. Aviation (ALL aviation) accounts for less than 5% of global CO2 emissions, which means we could leave that alone and cut elsewhere until we have batteries and other infrastructure good enough for that.
Build all this out and it'll be cheaper and more scalable than what we currently have.
We in the USA choose to stick with ancient technology because we have a sunk cost and an existing political power structure built around it. Meanwhile China is eating our lunch. Make America Great Again! By... pretending it's 1945 and trying to LARP the previous century.
Classic innovators' dilemma at the national level.
by SoftTalker
2 subcomments
- China has distracted the USA energy focus by dumping cheap solar panels here while continuing to develop advanced nuclear generation capabilities at home.
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