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fullsquare

@ fullsquare @awful.systems

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1 yr. ago

  • China has world’s first operational thorium nuclear reactor thanks to ‘strategic stamina’

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  • These are fast reactors and operate on different principles. The coolant there is sodium and while hard to design and run, it's doable. French had similar reactor but only one and it was shut down. Nice thing about fast reactors is that these can burn even-numbered isotopes of plutonium, useless in water moderated reactor, and give fresh mostly 239Pu plutonium of good quality. weapons grade even, and IAEA doesn't like it. But who cares since nonproliferation is dead anyway?

  • China has world’s first operational thorium nuclear reactor thanks to ‘strategic stamina’

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  • SMRs too

  • China has world’s first operational thorium nuclear reactor thanks to ‘strategic stamina’

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  • yeah either that or sometimes that one biologist illegally gene-editing embryos shows up

  • China has world’s first operational thorium nuclear reactor thanks to ‘strategic stamina’

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  • i will call MSRs (not thorium power, this is fine) toys until a single 100MWe+ unit gets built up. wanna bet that it won't happen in 20 years?

  • China has world’s first operational thorium nuclear reactor thanks to ‘strategic stamina’

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  • they haven't demonstrated anything yet, but maybe they will develop something. perhaps. maybe. it's all uncertain at this point and technology for it doesn't exist yet.

    high voltage transmission lines are a thing, look up where lignite or hydro power plants are situated relative to where people live. this is a solved problem

  • China has world’s first operational thorium nuclear reactor thanks to ‘strategic stamina’

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  • You're confusing subcritical reactors with thorium power

  • China has world’s first operational thorium nuclear reactor thanks to ‘strategic stamina’

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  • You absolutely can make a nuke out of thorium-derived material (first in Teapot MET, 1955, then possibly later by India). It's not widely used because plutonium is similar and in some important ways superior material

    The tradeoff in using salt as fuel/coolant is that now almost all the fission products are in soluble form, instead of nice ceramic chemically inert pellets, which makes any spill much worse, and i wouldn't say it's safer for this reason - it's different, and it's a tradeoff few thought it is worth making. We have figured out how to make PWRs not explode so it's not that big of a problem. This goes both for uranium or thorium as a fuel

    The reason Yucca Mountain is needed is that nuclear waste exists, if US reversed their policy on reprocessing maybe it wouldn't fill up so quickly. It's a matter of political will

    At least now, the chemical engineering for reprocessing fuel when reactor is on is not there. Maybe it'll get developed in this project, but this didn't happen yet. It all has to be weighed against existing alternatives, and it's possible to breed 233U in normal water-based reactors, so maybe there's a little reason to make MSRs in the first place. India has some thorium energy projects as well, but they're slowed down by lack of fissile material to bootstrap it (you can't fuel reactor using thorium only, it needs some fissile material)

  • China has world’s first operational thorium nuclear reactor thanks to ‘strategic stamina’

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  • what the fuck are you talking about

  • China has world’s first operational thorium nuclear reactor thanks to ‘strategic stamina’

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  • China has world’s first operational thorium nuclear reactor thanks to ‘strategic stamina’

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  • The article makes it very clear its running continuously, which is what they are celebrating

    i think you've read different article

    Chinese scientists have achieved a milestone in clean energy technology by successfully adding fresh fuel to an operational thorium molten salt reactor, according to state media reports.

  • China has world’s first operational thorium nuclear reactor thanks to ‘strategic stamina’

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  • i think that lack of willingness to handle fresh fission products has a part in this, in normal reactor you can just do nothing and win (bulk of most dangerous isotopes decays completely within 5y, not possible to do this with MSR)

  • China has world’s first operational thorium nuclear reactor thanks to ‘strategic stamina’

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  • That reactor is 2MWt, which is still somewhere about 1000x smaller than actual production reactors. But this is not the issue here, because in MSR the reactor is not the hard part, it's its entire fuel cycle.

    The entire point of having fuel as a solution instead of hard, nonreactive ceramic pellets put in tubes made of refractory metal is that there could be perhaps a way to extract fission products from coolant/fuel, which would prevent neutron capture by these fission products, which makes in turn better use of neutrons, so more fissile material can be bred. Benefit of this is that if that online recycling process can be made to work (big if - unsolved for now) then reactor works always like it's been freshly refueled. The hard part here is not reactor, it's the cleaning of fuel while reactor is still online. This has not been demonstrated, instead only new fuel was added, which is something that can be done with CANDU and some other designs where reactor is divided into channels

    First attempts at something like this used heavy water acidified solution of uranium nitrate, but this proved too corrosive and also water needed to be pressurized, and also it decomposes when subjected to radiation in this way. Today what is used is FLiBe, which is low-melting salt that doesn't decompose in this manner, but also is more corrosive and in different ways than water as used in PWRs. If that was the only problem, we would have MSRs left and right, but there are three other big problems

    Recovery of excess bred 233U or removal of neutron-absorbing fission products from FLiBe is hard, because you can't use normal methods used in nuclear reprocessing. There's no extraction like in PUREX, there's no ion exchange resin that can survive it, there's only fluoride volatility and some electrochemical methods, and it all would require significant research before anything close to viable comes up. The salt also probably has to be kept anhydrous at all times. This is the first problem. Maybe this reactor will be used for it, maybe it'll fail, but there's a related Problem that doesn't appear in more conventional reactors. In normal case, you can just leave fuel elements in water until the spiciest isotopes decay so that you don't have to deal with them. Here, we intentionally work with freshly irradiated, so ridiculously spicy fuel, and intentionally concentrate the most radiotoxic isotopes that are out there. Worse than that, all these fission products are not in form of chemically inert ceramic, these are in form of water soluble fluoride salts and this means that if anything of this gets into soil, it'll dissolve meaning that either fuel leak or waste stream leak would have much more severe consequences than if it was in conventional form. If you're trying to say that MSRs are safer for some reason, i'd have some serious reservations.

    The other problem is that FLiBe is a good moderator, meaning that any MSR reactor design using this salt is thermal reactor, and we already have this figured out in form of PWRs where we can use water instead. Look up India's plans for thorium power - they want to use PWR reactors for breeding 233U, with heavy water or not, because this already works and there's no actual reason for use of this highly experimental and uncertain technology. Keeping fuel rods in reactor for longer time is not an actual showstopper like it was expected in 60s when this concept first surfaced, in fact with advancement of nuclear technology burnup only goes up, i think it already is 2x or 3x what it used to be in early commercial power reactors. If MSR was the only way to make breeding work, we'd probably take effort to manage ridiculous radiotoxicity of this fuel mix, but because both chemical engineering to do so is not there and alternatives that don't have this problems exist, we don't. Charitably i'd could describe MSR fuel cycle idea as an highly experimental but promising while also requiring significant research expense. Less charitably, looking at all those years of research yielding nothing, i could also describe it as a dead end grift. You decide

    Note that all these problems come up with use of MSR, not thorium. Thorium for nuclear power is fine, but requires reprocessing, and some countries don't want to do this for diplomatic reasons (americans specifically) (tho i suspect it's masking the actual reason: some bean counter at westinghouse calculated it's cheaper to use fresh uranium instead - reprocessing is a lot of dangerous, well-paid, complicated work - in countries where labour costs are lower, or where govt is willing to pay up to have reserve of nuclear material, which amounts to all other countries that have sufficiently advanced nuclear industry, reprocessing does happen. french, chinese, russians, indians, japanese, koreans, and probably a couple more do reprocess their fuel. there's a couple of countries that send their fuel to manufacturer, and some just discard it underground without reprocessing) (this is also why yucca mountain filling up is a problem of entirely american making, and the only thing that is lacking in order to solve it is political will)

  • China has world’s first operational thorium nuclear reactor thanks to ‘strategic stamina’

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  • There were small reactors that ran on thorium. Scaling up all the necessary molten salt processing will be pretty hard thing to do, if this thing can even run continously that is

  • China has world’s first operational thorium nuclear reactor thanks to ‘strategic stamina’

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  • this is toy sized reactor, not even entire technology demonstrator, there are medical isotope/research reactors with power 20MWt and more

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  • that's how you know he didn't succeed yet

  • White House Says It Has Tech That Can 'Manipulate Time and Space'

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  • in this house we obey laws of physics

  • Eggs are so expensive that some Americans are decorating potatoes this Easter

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  • decisive belarusian cultural victory

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  • it's not if you pay up https://www.wheresyoured.at/wheres-the-money/

    ed paid, and that's what he got. this all comes with caveat that this count doesn't include deepseek chinese customers, but that's barely relevant to sv bubble

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  • claude has something like 1/30 of chatgpt userbase, it's not relevant and anthropic can't pick up opeai users when (not if) it collapses. also somehow they are even faster at burning their money