We should go and find more customers.
Technically, yes. Politically, no.
“To produce fuel for the submarines’ naval propulsion, the ability to enrich uranium was required. However, this plan probably served two goals, since a country with enrichment capability can also enrich uranium to weapons-grade levels without significant difficulty. The fact that [former President Roh Moo-hyun] launched this plan less than five months after North Korea’s [2003] withdrawal from the Non-Proliferation Treaty (NPT) supports the possibility that his ulterior motive was to acquire uranium enrichment capability in part to enable the future development of nuclear weapons. Ultimately, Roh had to abandon this plan in 2004 amid rising suspicion of South Korea’s nuclear ambitions after the International Atomic Energy Agency (IAEA) discovered that South Korean scientists had previously conducted an unauthorized enrichment experiment” [1].
[1] https://www.csis.org/analysis/will-south-koreas-nuclear-ambi...
Wikipedia says U235 is ~0.7% of earth deposits, and as little as 7kg may be required for a minimal nuclear device. Processing, 700kg of uranium does not sound insurmountable, even with a terribly slow and inefficient process. Just grinding it up and using some kind of mass spectrometer could trivially separate a 3Dalton mass difference.
There was no NPT in the 40s. And we weren’t technically at war with a nuclear-armed Canada backed by a pro-NPT international alliance.
It’s not a casual undertaking and other nations will know you’re doing it. The major global powers are not interested in more nuclear weapons, not only to maintain their hegemony but also to limit the number of parties that could cause massive issues. Not to mention the likelihood that a national or political shift could mean nukes in the hands of those less…restrained.
Plus it raises the surface area of others gaining access to the material or capabilities. Proliferation is bad for the world, generally.
The challenges are primarily geopolitical. There are uranium enrichment operations in a number of countries around the world. Weapons grade enrichment is a lot harder, but nothing that a sufficiently funded and motivated nation state couldn’t achieve if they wanted to and, most importantly, didn’t have any other countries discover it.
> Processing, 700kg of uranium does not sound insurmountable, even with a terribly slow and inefficient process.
You have to get enough uranium ore, process that down, then enrich it on a large scale. Uranium ore deposits aren’t very uranium dense except for a few known mines, so pulling rocks out of the ground in another country may produce extremely low yields.
Enrichment is a very slow process requiring a lot of stages because U235 and U238 are barely different, so they don’t separate much in each stage. Everything has to work together and work well. Like you said it’s not insurmountable, but by the time a country has spent years mining low-yield ore and building complicated many stage centrifuges they’re likely to make a mistake that leads to an intelligence agency catching on.
Zvi and the Cato institute both have lengthy pieces about why the Jones act is bad [1] [2], and whether or not you believe that has entrenched our shipbuilders, the US essentially manufactures no ships compared to South Korea and China.
This naval news post says there are $5 billion in modernization costs for the shipyard needed for this project so it seems like we're still years away from a started (much less completed) project.
[1] Nov 2024 https://thezvi.substack.com/p/repeal-the-jones-act-of-1920
[2] June 2018 https://www.cato.org/publications/policy-analysis/jones-act-...
From the same source as this article, American HHI working with Korean HD HHI. No real action yet but both companies want to be working together. https://www.navalnews.com/naval-news/2025/10/hii-hosts-hd-hh...
Edit: Your downvotes only make me more powerful.
The transmission from sub / ship to shore is not great I think, though. They're used for power during disaster recovery?
Imagine if the title was : "China Gives South Korea Green Light to Build Nuclear Submarines".
What would the comments here be like. No doubt a lot of nonsense about "the ccp" this and "the ccp" that.
Like obviously no matter the country, if you want to build weapons offshore in their territory you probably need permission.
That's the point. South korea is not allowed to build nuclear submarines in their own territory. They lack the sovereignty to do it. The US won't give them permission to build one on their own.
But you probably knew this and your comment is meant to distract.
Are you being intentionally dense? Why wouldn't they be building it in their own territory if nobody was stopping them?
Besides, I already replied to your other comment that South korea is not allowed to enrich uranium by the US.
Because they don't have the facilities to build a nuclear sub, and America does, since America has built over 200+ nuclear submarines in the past?
Building a nuclear sub, and fueling it, are two separate things.
Yes you are. An easy tell is "citation needed".
> there is no law
Another tell.
> If RoK wanted to spend a percentage of their GDP on enrichment facilities they could
And they have in the past. Guess who shut that down?
> They don't have an urgent reason to.
South korea is surrounded by 3 nuclear powers ( north korea, china, russia ) and militarily occupied by another nuclear power and yet, they have no urgent reason to? Good one.
> Why would RoK want their own enrichment facilities?
This is just absurd. Your questions answer themselves. And it's obvious you already know the answers but just are trying to distract.
You keep googling and I'll look for the citations. Okay buddy?
They actually could. This has been an ongoing discussion in South Korean politics for years. Nuclear Submarine shipbuilding is a large undertaking and it requires a lot of security to prevent sabotage in ways that other types of shipbuilding just don't have to put up with. So it is in many ways cheaper and more secure to just rely on the US for nuclear shipbuilding as we already have the infrastructure and we are on the opposite side of the world from any adversaries who would have interest in sabotage.
> Besides, I already replied to your other comment that South korea is not allowed to enrich uranium by the US.
This is not true. There are mutual agreements that set the limits on enriched uranium for military purposes but they are flexible agreements that can be renegotiated or broken off as needed. The US has them with everyone including our allies and our adversaries. It's essentially just a tool to say "hey you need to discuss this publicly within your country first before you can change it". Nothing more or less.
And the US has an agreement with South Korea that limits domestic production of fissile material for military uses but it's a mutual agreement that we have with a bunch of countries (including China) and is essentially always renegotiable as situations change. Essentially it's just an explicit agreement of how much material a given country intends on producing for the purposes of requiring public political discussions domestically before ramping up production.
That is all very much a flexible situation and the US doesn't have any actual power to legitimately stop South Korea from manufacturing domestic nuclear reactors for military purposes.
Fully agree that reading either for geopolitical opinions is useless.
The US won't allow south korea to enrich uranium on their own. Want to try again?
> I would recommend going beyond simply reading the headline.
Another intentional distracting comment.
190 nations have signed the Non-Proliferation Treaty. This includes China, so the very US vs China premise here is misplaced.
[The US, UK, France, Russia, China and 185 other countries] won't allow south korea to enrich uranium on their own
Who cares?
> This includes China, so the very US vs China premise here is misplaced.
Sure. But it wasn't china that stopped korea's and japan's secret nuclear programs. It was the US.
> [The US, UK, France, Russia, China and 185 other countries] won't allow south korea to enrich uranium on their own
Just like they prevented north korea...
Your response debunks your response. It's quite remarkable actually.
The only country that can prevent another country is the one militarily occupying it. China, France, Russia, UK and the other 185 countries don't militarily occupy south korea. The only reason north korea, israel, india, pakistan, etc were able to go nuclear is because they are not vassal states military occupied by a foreign power.
The treaty restricting Korea is the Treaty on the Non-Proliferation of Nuclear Weapons [1]. America is giving Seoul a loophole by offering to do the NPT-governed work.
[1] https://en.wikipedia.org/wiki/Treaty_on_the_Non-Proliferatio...
> The treaty restricting Korea is the Treaty on the Non-Proliferation of Nuclear Weapons [1].
Or maybe Korea could be like India, your native country, and not be part of it.
> America is giving Seoul a loophole by offering to do the NPT-governed work.
Yeah, a loophole seoul doesn't need. You act like america is doing korea a favor. All this does is make korea even more dependent on the US. Even more of a vassal.
No. America is doing itself a favor. Not south korea.
> It could ratchet sanctions (see: Iran) and ravage SK’s position and economic power on the global stage without its sign-off.
So you are saying that korea is not a sovereign state like iran but a vassal to the US. Maybe the US could protect korea (see: Israel) and send billions of taxpayer dollars to korea.
Sure. That comes with costs. Cost that don't make sense for Korea, which is a defense exporter globally and within the American-led Pacific alliance.
> your native country
What the fuck. (Also, not entirely true.)
> a loophole seoul doesn't need
You're using the word "need" ambiguously. It's a loophole Seoul benefits from. It gets the benefits of being an NPT signatory and alliance member. And it gets nuclear submarines.
> You act like america is doing korea a favor
Within narrow confines, it is. Within broader confines, it's acting as the senior security partner. That obviously involves a cession of sovereignty. Same goes for Pakistan vis-a-vis China, or Belarus with Russia.
> Subsequently, the construction of Nuclear submarines marks a departure from past efforts, as previous South Korean submarine construction has focused primarily on conventionally powered submarines
rayiner•1h ago
echelon•1h ago
We should get every country to do this.
Build your nuclear subs here, in the US shipyards. We'll help you!
We can massively expand our capacity, which will be important for self defense in the coming decades.
tyre•51m ago
If they aren’t, you can’t neutralize the enemies supplies. If they are, those third countries are effectively part of the conflict.
The US had to take the latter stance because it didn’t have a strong industry to product its own weapons. If it supported nations from buying from non-warring parties, it would be shit out of luck if it had its own wars. So it received a lot of investment from European powers, generating jobs, economic growth, and the funding to expand its domestic production without having to take on debt or wait for a war to break out.
Come its entry into WWI and then WWII, the US had a strong home base of industrial capacity for arms manufacturing.
Waterluvian•43m ago
kakacik•20m ago
Trust lost is trust that either never comes back or it takes tremendous, long term continuous effort. Not holding my breath.
adgjlsfhk1•17m ago
echelon•17m ago
cjs_ac•12m ago