A fun fact about Otto Hahn, is that its first captain was Heinrich Lehmann-Willenbrock, the former submarine captain who is portrayed in the movie (and book) Das Boot. So he both sank and navigated ships.
This is a solid, well-argued piece, and I agree with the central claim: nuclear propulsion works at sea only when it removes a hard physical constraint, not when it merely improves fuel economics. Submarines, carriers, and icebreakers succeed because nuclear power is mission-enabling, not because it’s cheaper.
Where I’d push back a bit is on treating history as fully dispositive of the future.
Past civilian nuclear ships failed largely because fossil fuels were cheap, politically neutral, and easy to supply back then. That assumption is weakening. A lot/fast. Decarbonization rules don’t just raise fuel costs — they introduce policy and regulatory risk, which conventional shipping has never had to price in. Nuclear’s real advantage isn’t cheap energy; it’s insulation from fuel and emissions policy volatility and increasing costs.
I also think some “institutional” barriers are less fixed than implied. Crew premiums, port access restrictions, and insurance hurdles were/are real — but they were also a function of nuclear being 'exotic'. Which it arguably isn't now anymore. Aviation shows those frictions can shrink rapidly once a technology becomes standardized rather than exceptional.
I do agree that nuclear shipping won’t be general-purpose. But for very large vessels on fixed routes, especially under strict emissions regimes or in remote regions, the advantage may shift from marginal to operationally decisive — closer to the icebreaker case than the Otto Hahn case.
Bottom line: nuclear shipping definitely isn’t a broad solution, and likely never will be. But under sustained decarbonization pressure, it may occupy a slightly larger, more durable niche than in the past, driven less by fuel economics than by regulatory and policy constraints.
There’s an important historical truth in what you’re saying, and also some overstatement that weakens it.
Yes: the U.S. nuclear build-out of the 1960s–early 1970s was real, fast, and largely successful. Plants were being completed at an extraordinary rate, and there were no catastrophic public-health failures during that period. The industry’s collapse did not begin with Three Mile Island; many cancellations pre-dated it. Cost escalation was driven heavily by schedule disruption, financing costs, and regulatory churn, not by inherent technical failure.
It’s also correct that opposition strategy evolved toward procedural and legal obstruction, especially through environmental permitting and litigation. Lengthening construction timelines in a capital-intensive industry is enough, by itself, to make projects uneconomic. That became a self-fulfilling mechanism.
Where the argument goes too far is in treating this as purely bad faith or oligarchic suppression.
Two additional forces mattered:
1) Institutional learning lagged behind scale
Early plants benefited from standardization, cheap capital, and a permissive political environment. As designs diversified, utilities lost replication benefits, while supply chains and project management failed to industrialize properly. That wasn’t sabotage. It was an immature delivery model colliding with rising expectations.
2) Public risk tolerance collapsed asymmetrically
You’re right that fossil fuel accidents kill way more people and trigger way less backlash. But nuclear’s failure mode is political, not statistical. A single visible event - even without casualties - can halt an entire program. That asymmetry is real, frustratingly irrational in many respects, but still structurally decisive.
On LNT: it’s fair to say the model is deeply conservative and likely overstates low-dose risk. Many radiation biologists now acknowledge repair mechanisms, thresholds, or hormesis. But regulators default to conservatism because nuclear accidents can cross borders and affect generations, and liability regimes were never harmonized enough to allow risk-based relaxation without political backlash. That’s prudence layered on fear, not a fossil-fuel industry conspiracy.
Finally, anti-nuclear NGO funding and activism absolutely did influence outcomes, but so did utilities themselves, who often preferred regulatory protection and cost recovery to true industrial scaling. The industry was not just a victim; it also adapted poorly.
Bottom line:
Nuclear wasn’t killed by physics or safety data.
It wasn’t killed only by activists either.
It was killed by a toxic interaction of regulatory accretion, capital cost sensitivity, political risk asymmetry, and failure to industrialize delivery before initial social license/acceptance evaporated in the wake of high profile accidents.
That lesson matters far more than assigning villains, especially if nuclear is to have a second act that actually sticks.
Never is a long time. Nuclear fusion will likely be practical some day. For bulk shipping and long distances there is no competition to nuclear technologically. The problem is corruption, ultimately.
People talk about SMRs, like well it's built in a factory. That's not the point. You don't get low price and reliable availability just because it's built in a factory. You get that from large scale production. Not one reactor every year or two. But one or more reactors every day coming off of an assembly line. As Musk says, designing the machine is easy, designing the factory to produce the machine is the difficult part.
And therein is the problem. The current regulatory regimes are entirely antithetical to factory, assembly line production and incremental improvement. These are modern industrial standards that the regulators must submit to. And preventing that is unquestionably reducing safety. Those regulatory regimes are not there for safety, their purpose is suppression of an energy source that isn't wanted by the oligarchies of extreme wealth and power.
There’s a lot here I agree with in this comment, but a couple of important pushbacks/corrections to make…
“Never” is a long time — agreed. Fusion may well become practical someday. I sincerely hope so. But that’s irrelevant to today’s shipping debate; policy and investment decisions can’t be based on a technology that doesn’t yet exist at commercial scale. And most likely won’t be for many more decades to come.
You’re right that scale, not SMRs per se, is the real cost lever. Factory production only works if volume is high and continuous. One reactor every year is craft/artisanal production, not modern industrial manufacturing.
Where I strongly disagree is the framing of regulation as primarily oligarchic suppression. Nuclear regulation does impose real cost and rigidity — but it exists for a very good reason: because failure modes are catastrophic, cross-border, and politically unforgiving. Regulators respond to that reality, not to Musk-style manufacturing ideals.
The hard truth is that nuclear needs both scale and credible public risk tolerance. You don’t get assembly-line reactors without social license, standardized liability regimes, and decades of demonstrated reliability. That’s the binding constraint — not just bad regulators or shadowy interests.
If you believe that, you'd have a whole lot to explain. Like how the US was completing one NPP/month by 1974, with two more on order per month. At that rate by the 1990s the US would have been nearly 100% clean nuclear electricity. Explain how you figure safety was being sacrificed then? Where were the "catastrophic failures"? And then the nuclear blockade began:
Listen to the top Nuclear physicists Charles Till and Yoon Il Chang on the early history of the wealthy anti-nuclear movement, from page 14 of their book on the IFR, Plentiful Energy:
"....Organized opposition had begun, arguing environmentalism initially, and then joined by proliferation-related attacks. In the last year or two of the sixties the attacks had begun and with growing influence, by the mid-seventies the anti-nuclear groups had had their way. Their strategy focused on driving up the cost of nuclear power plant construction, so far up that the plants would be uneconomic, if possible. To do so, they attacked every issue that could be used to insert the legal system into interference with construction decisions, blocking construction progress by any means possible. In so doing they introduced very lengthy construction delays. Success in delaying nuclear construction while interest on the borrowed construction funding kept increasing and increasing eventually made their argument self-fulfilling. They had made their assertion a reality; nuclear construction was now expensive. Every possible facet of the legal system was used. Plant after plant with financing in place for billions of dollars, and interest charges running up, had construction held up month after month, year after year, by one legal challenge after another, as a rule related in some way to environmental permits. Nuclear opponents could congratulate themselves; they had destroyed an industry. Their strategy had been a brilliant success. To what purpose, though, may one ask? It stopped orderly progression of nuclear power development and implementation by the U. S., and, indeed, led to similarly destructive movements in other countries too. The world then went back to fossil energy and hundreds, more probably thousands, of new fossil fuel plants have gone into operation in the years since then...."
And the shutdown began Before TMI, forty planned nuclear power plants already had been canceled before the TMI accident.. Funny how after the massive Gulf destroying Oil rig explosion, which unlike TMI, actually killed people, oil drilling just continued as usual. And the Kleen energy NG power plant explosion that killed six workers, business-as-usual.
And this. If you just look at the anti-nuclear groups:
"...There are more than 700 nonprofits and other advocacy groups in the United States that oppose the use of carbon free nuclear energy. An August 2023 analysis from the Capital Research Center examined fewer than 200 nonprofits that opposed nuclear energy and conservatively estimated that the total combined annual revenue of the American opponents of nuclear power exceeded $2.3 billion..."
That's just American. Worldwide there are far more. $billion/yr in secretive funding. How is it that tax exempt NGOs can accept multi-$million donations, which is how they are typically funded, and those donors are anonymous, when they are obviously doing the despicable, dirty work of trying to kneecap their competition?
And you'd also have to explain how a high school level theory of radiation harm has been foisted on the Nuclear industry worldwide, entirely absurd. With the creep who devised it, being a fanatical eugenicist, too radical for even Stalin, who tried to kill him, actually winning a Nobel Prize for a non-peer reviewed paper, full of errors. And his work being promoted & institutionalized by the Big Oil Rockefeller syndicate.
The LNT Report: How Bad Science Made The World Afraid of Nuclear Power Kindle Edition, by Mike Conley:
"... LNT (“Linear No-Threshold”) is the hypothesis that any amount of nuclear radiation, no matter how tiny, does some harm, and the only safe dose of radiation is zero. This hypothesis is provably false, and yet it has dominated nuclear policy since the 1940s, holding back the development of the safest, most efficient, and cleanest form of energy generation. ... fascinating detective story, uncovering the history of the LNT dogma, showing how it finally came to be exposed and debunked as bad science (BS). Careless assumptions, panicky post-Hiroshima emotions, careerist bad faith, and the financial interests of fossil-fuel titans all played a part. The result was the domination of public discussion by a false conclusion: radiation is risky in any quantity, no matter how low the dose. ...., Muller and his supporters employed all available means to cover up the deficiencies in LNT, even to the point of suppressing contrary evidence. ...at every step, wrong assumptions and unsound experimental techniques were employed to save LNT from public refutation, and to save Muller’s Nobel Prize from being scandalously discredited. The truth, finally made clear by many years of careful scientific examination and by recent advances in cell biology, is that low doses of radiation are harmless, and even beneficial to health, because of the human body’s natural ability to repair cells damaged by radiation. Fears of the risks of nuclear power have been wildly exaggerated and then irresponsibly hyped. ...Low-dose radiation is like exercise for your body’s cells, which naturally respond by up-regulating their DNA repair mechanisms. Nuclear energy is not only clean and inexhaustible, its risks are far smaller than the hazards of any alternative, including not just fossil fuels but also ‘renewables’, solar and wind, which turn out to be more dangerous than people have been led to believe, as well as unsustainable economically. Wind and solar can only be maintained if supported by nuclear power or fossil fuels, ... traces the twists and turns of LNT’s reception and dissemination by politicians, media, and the public. The propagation of LNT was boosted by people’s horror at the prospect of nuclear war, motivating them to say anything to discredit nuclear energy, and also by fossil fuel financial interests, which had their own anti-nuclear bias. The LNT Report has been exhaustively..."
Yes, LNT dogma promoted by the same bunch who are now pushing us towards a nuclear war with Russia. No radiation fear porn there. Nuclear bombs aren't a radiation hazard, no siree, Bob, don't worry about that. They're even bombing or trying to bomb nuclear reactors in Ukraine & Russia. No problem there.
A molten salt reactor would be an ideal ship reactor I would say. Very compact, very efficient, no high pressure vessel breach risk or bulk, no risk of compact corium melting its way through the hull in a core breach. And a lot of the most dangerous isotopes can be removed continuously or at a service stop. And refueling should be easier with less down time.
Molten salt, in a core breach would just spill out on the bottom containment, spread out, stopping all fission, and cooling fairly rapidly if the bottom containment is well designed for the purpose.
There is already an ideal reactor for that purpose being planned. The Copenhagen Atomics 100MWth, 40MWe thorium molten salt reactor. With a heavy water moderator and molten salt cooling. A shipping container sized unit:
They are planning on mass producing thorium MSRs, using 5% enriched uranium startup fuel (they would like to use SNF derived MOX startup fuel but the regulators won't let them). They plan on building one/day in a factory. They can get lots of investors, lots of interest, the reactor and factory design is not a problem. The big obstacle is these corrupt regulators. All in countries that proclaim they are in an all out war against climate change & CO2 emissions. Hypocrites, Grifters & Liars. Listen what happens when their investors talk with the Regulators:
Thorium Molten-Salt Reactor, Copenhagen Atomics Onion Core - Thomas Jam Pederson @ TEAC12:
So, in fact, nuclear powered long distance, large shipping is a no-brainer. The key is factory produced SMRs, especially compact units like the one I described. If our political leaders really cared about emissions, climate change, energy security and energy wars, (Hint - they don't), they would make sure these reactors were mass produced in large quantities. At a small fraction of the $7T they've spent on wind/solar/hydrogen/battery storage. With zero results. A miserly 1.1% of Global Primary Energy Supply. Won't even supply the increase in World energy consumption never mind replacing any fossil energy. A total joke.
One thing for sure, anyone builds a Nuclear powered ship, like China is planning, the mercenary NGOs, mass media, labor unions, legal-lobby firms will be go on a rampage trying to block them, with endless lawsuits, unions refusing to unload them, media fear porn campaigns, national boycotts and blockades by corrupt politicians. And, as usual, none of the above will reveal who is lavishly funding them. That's top secret.
China is planning on putting its thorium molten salt reactors on giant container ships. Ten years between refueling vs every few thousand miles. Negligible fuel vs 150 tonnes dirty bunker oil/day.
They are planning ultra-large container ship with a reported capacity of 14,000 to 25,000 twenty foot containers. Powered by a 200MWth, 50MWe reactor. Also planning to develop an sCO2 turbine for it @ 45-50% efficiency, pushing it to 100MWe output. Also would use a 10MW diesel generator as a backup. 40 yr operating life on the reactor.
Watch the mercenary NGOs go berserk trying to block those ships, the same ones screaming about "Global Boiling" and "Climate Change is an existential threat to humanity".
China to Build a Thorium-Powered Mega Ship That Never Shuts Down, BeyondTheBuild
"China has just revealed full specifications for the world’s largest nuclear-powered cargo ship — and it’s a breakthrough that could transform global shipping.
This massive vessel can carry 14,000 containers and is powered by a thorium-based molten salt reactor, capable of delivering steady, high-output energy with far less radioactive waste.
Thorium reactors don’t just cut emissions — they could eliminate fuel costs entirely for long-distance shipping.
And China has taken a major step forward by proving they can convert thorium into usable uranium fuel inside a working reactor, giving the country greater energy independence than ever before.
In this video, we explore:
⚛️ How thorium molten salt reactors work — and why they’re safer
🚢 How a nuclear-powered cargo ship can cross oceans without refueling
📦 Why 14,000-container capacity changes global logistics
🌍 China’s push to bring nuclear tech into commercial transport
💡 What this means for emissions, shipping costs, and energy security
This isn’t just a ship —
it’s a floating nuclear revolution that could reshape world trade."
One dimension I’d be curious to hear you address is the market demand for faster trans-oceanic shipping. As you noted earlier, power demands scale non-linearly with speed, thereby naturally constraining diesel-powered shipping to a more “leisurely” pace. But arguably nuclear propulsion would ease that restriction; does this factor in, especially given the much higher volume of trans-Pacific trade compared to fifty years ago? Or do you see the premium from faster shipment times as being marginal?
A fun fact about Otto Hahn, is that its first captain was Heinrich Lehmann-Willenbrock, the former submarine captain who is portrayed in the movie (and book) Das Boot. So he both sank and navigated ships.
This is a solid, well-argued piece, and I agree with the central claim: nuclear propulsion works at sea only when it removes a hard physical constraint, not when it merely improves fuel economics. Submarines, carriers, and icebreakers succeed because nuclear power is mission-enabling, not because it’s cheaper.
Where I’d push back a bit is on treating history as fully dispositive of the future.
Past civilian nuclear ships failed largely because fossil fuels were cheap, politically neutral, and easy to supply back then. That assumption is weakening. A lot/fast. Decarbonization rules don’t just raise fuel costs — they introduce policy and regulatory risk, which conventional shipping has never had to price in. Nuclear’s real advantage isn’t cheap energy; it’s insulation from fuel and emissions policy volatility and increasing costs.
I also think some “institutional” barriers are less fixed than implied. Crew premiums, port access restrictions, and insurance hurdles were/are real — but they were also a function of nuclear being 'exotic'. Which it arguably isn't now anymore. Aviation shows those frictions can shrink rapidly once a technology becomes standardized rather than exceptional.
I do agree that nuclear shipping won’t be general-purpose. But for very large vessels on fixed routes, especially under strict emissions regimes or in remote regions, the advantage may shift from marginal to operationally decisive — closer to the icebreaker case than the Otto Hahn case.
Bottom line: nuclear shipping definitely isn’t a broad solution, and likely never will be. But under sustained decarbonization pressure, it may occupy a slightly larger, more durable niche than in the past, driven less by fuel economics than by regulatory and policy constraints.
There’s an important historical truth in what you’re saying, and also some overstatement that weakens it.
Yes: the U.S. nuclear build-out of the 1960s–early 1970s was real, fast, and largely successful. Plants were being completed at an extraordinary rate, and there were no catastrophic public-health failures during that period. The industry’s collapse did not begin with Three Mile Island; many cancellations pre-dated it. Cost escalation was driven heavily by schedule disruption, financing costs, and regulatory churn, not by inherent technical failure.
It’s also correct that opposition strategy evolved toward procedural and legal obstruction, especially through environmental permitting and litigation. Lengthening construction timelines in a capital-intensive industry is enough, by itself, to make projects uneconomic. That became a self-fulfilling mechanism.
Where the argument goes too far is in treating this as purely bad faith or oligarchic suppression.
Two additional forces mattered:
1) Institutional learning lagged behind scale
Early plants benefited from standardization, cheap capital, and a permissive political environment. As designs diversified, utilities lost replication benefits, while supply chains and project management failed to industrialize properly. That wasn’t sabotage. It was an immature delivery model colliding with rising expectations.
2) Public risk tolerance collapsed asymmetrically
You’re right that fossil fuel accidents kill way more people and trigger way less backlash. But nuclear’s failure mode is political, not statistical. A single visible event - even without casualties - can halt an entire program. That asymmetry is real, frustratingly irrational in many respects, but still structurally decisive.
On LNT: it’s fair to say the model is deeply conservative and likely overstates low-dose risk. Many radiation biologists now acknowledge repair mechanisms, thresholds, or hormesis. But regulators default to conservatism because nuclear accidents can cross borders and affect generations, and liability regimes were never harmonized enough to allow risk-based relaxation without political backlash. That’s prudence layered on fear, not a fossil-fuel industry conspiracy.
Finally, anti-nuclear NGO funding and activism absolutely did influence outcomes, but so did utilities themselves, who often preferred regulatory protection and cost recovery to true industrial scaling. The industry was not just a victim; it also adapted poorly.
Bottom line:
Nuclear wasn’t killed by physics or safety data.
It wasn’t killed only by activists either.
It was killed by a toxic interaction of regulatory accretion, capital cost sensitivity, political risk asymmetry, and failure to industrialize delivery before initial social license/acceptance evaporated in the wake of high profile accidents.
That lesson matters far more than assigning villains, especially if nuclear is to have a second act that actually sticks.
Never is a long time. Nuclear fusion will likely be practical some day. For bulk shipping and long distances there is no competition to nuclear technologically. The problem is corruption, ultimately.
People talk about SMRs, like well it's built in a factory. That's not the point. You don't get low price and reliable availability just because it's built in a factory. You get that from large scale production. Not one reactor every year or two. But one or more reactors every day coming off of an assembly line. As Musk says, designing the machine is easy, designing the factory to produce the machine is the difficult part.
And therein is the problem. The current regulatory regimes are entirely antithetical to factory, assembly line production and incremental improvement. These are modern industrial standards that the regulators must submit to. And preventing that is unquestionably reducing safety. Those regulatory regimes are not there for safety, their purpose is suppression of an energy source that isn't wanted by the oligarchies of extreme wealth and power.
There’s a lot here I agree with in this comment, but a couple of important pushbacks/corrections to make…
“Never” is a long time — agreed. Fusion may well become practical someday. I sincerely hope so. But that’s irrelevant to today’s shipping debate; policy and investment decisions can’t be based on a technology that doesn’t yet exist at commercial scale. And most likely won’t be for many more decades to come.
You’re right that scale, not SMRs per se, is the real cost lever. Factory production only works if volume is high and continuous. One reactor every year is craft/artisanal production, not modern industrial manufacturing.
Where I strongly disagree is the framing of regulation as primarily oligarchic suppression. Nuclear regulation does impose real cost and rigidity — but it exists for a very good reason: because failure modes are catastrophic, cross-border, and politically unforgiving. Regulators respond to that reality, not to Musk-style manufacturing ideals.
The hard truth is that nuclear needs both scale and credible public risk tolerance. You don’t get assembly-line reactors without social license, standardized liability regimes, and decades of demonstrated reliability. That’s the binding constraint — not just bad regulators or shadowy interests.
If you believe that, you'd have a whole lot to explain. Like how the US was completing one NPP/month by 1974, with two more on order per month. At that rate by the 1990s the US would have been nearly 100% clean nuclear electricity. Explain how you figure safety was being sacrificed then? Where were the "catastrophic failures"? And then the nuclear blockade began:
Listen to the top Nuclear physicists Charles Till and Yoon Il Chang on the early history of the wealthy anti-nuclear movement, from page 14 of their book on the IFR, Plentiful Energy:
"....Organized opposition had begun, arguing environmentalism initially, and then joined by proliferation-related attacks. In the last year or two of the sixties the attacks had begun and with growing influence, by the mid-seventies the anti-nuclear groups had had their way. Their strategy focused on driving up the cost of nuclear power plant construction, so far up that the plants would be uneconomic, if possible. To do so, they attacked every issue that could be used to insert the legal system into interference with construction decisions, blocking construction progress by any means possible. In so doing they introduced very lengthy construction delays. Success in delaying nuclear construction while interest on the borrowed construction funding kept increasing and increasing eventually made their argument self-fulfilling. They had made their assertion a reality; nuclear construction was now expensive. Every possible facet of the legal system was used. Plant after plant with financing in place for billions of dollars, and interest charges running up, had construction held up month after month, year after year, by one legal challenge after another, as a rule related in some way to environmental permits. Nuclear opponents could congratulate themselves; they had destroyed an industry. Their strategy had been a brilliant success. To what purpose, though, may one ask? It stopped orderly progression of nuclear power development and implementation by the U. S., and, indeed, led to similarly destructive movements in other countries too. The world then went back to fossil energy and hundreds, more probably thousands, of new fossil fuel plants have gone into operation in the years since then...."
And the shutdown began Before TMI, forty planned nuclear power plants already had been canceled before the TMI accident.. Funny how after the massive Gulf destroying Oil rig explosion, which unlike TMI, actually killed people, oil drilling just continued as usual. And the Kleen energy NG power plant explosion that killed six workers, business-as-usual.
And this. If you just look at the anti-nuclear groups:
"...There are more than 700 nonprofits and other advocacy groups in the United States that oppose the use of carbon free nuclear energy. An August 2023 analysis from the Capital Research Center examined fewer than 200 nonprofits that opposed nuclear energy and conservatively estimated that the total combined annual revenue of the American opponents of nuclear power exceeded $2.3 billion..."
https://www.influencewatch.org/movement/opposition-to-nuclear-energy/
That's just American. Worldwide there are far more. $billion/yr in secretive funding. How is it that tax exempt NGOs can accept multi-$million donations, which is how they are typically funded, and those donors are anonymous, when they are obviously doing the despicable, dirty work of trying to kneecap their competition?
And you'd also have to explain how a high school level theory of radiation harm has been foisted on the Nuclear industry worldwide, entirely absurd. With the creep who devised it, being a fanatical eugenicist, too radical for even Stalin, who tried to kill him, actually winning a Nobel Prize for a non-peer reviewed paper, full of errors. And his work being promoted & institutionalized by the Big Oil Rockefeller syndicate.
The LNT Report: How Bad Science Made The World Afraid of Nuclear Power Kindle Edition, by Mike Conley:
https://www.amazon.com/LNT-Report-Science-Afraid-Nuclear-ebook/dp/B0F4X9CH6D/
"... LNT (“Linear No-Threshold”) is the hypothesis that any amount of nuclear radiation, no matter how tiny, does some harm, and the only safe dose of radiation is zero. This hypothesis is provably false, and yet it has dominated nuclear policy since the 1940s, holding back the development of the safest, most efficient, and cleanest form of energy generation. ... fascinating detective story, uncovering the history of the LNT dogma, showing how it finally came to be exposed and debunked as bad science (BS). Careless assumptions, panicky post-Hiroshima emotions, careerist bad faith, and the financial interests of fossil-fuel titans all played a part. The result was the domination of public discussion by a false conclusion: radiation is risky in any quantity, no matter how low the dose. ...., Muller and his supporters employed all available means to cover up the deficiencies in LNT, even to the point of suppressing contrary evidence. ...at every step, wrong assumptions and unsound experimental techniques were employed to save LNT from public refutation, and to save Muller’s Nobel Prize from being scandalously discredited. The truth, finally made clear by many years of careful scientific examination and by recent advances in cell biology, is that low doses of radiation are harmless, and even beneficial to health, because of the human body’s natural ability to repair cells damaged by radiation. Fears of the risks of nuclear power have been wildly exaggerated and then irresponsibly hyped. ...Low-dose radiation is like exercise for your body’s cells, which naturally respond by up-regulating their DNA repair mechanisms. Nuclear energy is not only clean and inexhaustible, its risks are far smaller than the hazards of any alternative, including not just fossil fuels but also ‘renewables’, solar and wind, which turn out to be more dangerous than people have been led to believe, as well as unsustainable economically. Wind and solar can only be maintained if supported by nuclear power or fossil fuels, ... traces the twists and turns of LNT’s reception and dissemination by politicians, media, and the public. The propagation of LNT was boosted by people’s horror at the prospect of nuclear war, motivating them to say anything to discredit nuclear energy, and also by fossil fuel financial interests, which had their own anti-nuclear bias. The LNT Report has been exhaustively..."
Yes, LNT dogma promoted by the same bunch who are now pushing us towards a nuclear war with Russia. No radiation fear porn there. Nuclear bombs aren't a radiation hazard, no siree, Bob, don't worry about that. They're even bombing or trying to bomb nuclear reactors in Ukraine & Russia. No problem there.
A molten salt reactor would be an ideal ship reactor I would say. Very compact, very efficient, no high pressure vessel breach risk or bulk, no risk of compact corium melting its way through the hull in a core breach. And a lot of the most dangerous isotopes can be removed continuously or at a service stop. And refueling should be easier with less down time.
Molten salt, in a core breach would just spill out on the bottom containment, spread out, stopping all fission, and cooling fairly rapidly if the bottom containment is well designed for the purpose.
There is already an ideal reactor for that purpose being planned. The Copenhagen Atomics 100MWth, 40MWe thorium molten salt reactor. With a heavy water moderator and molten salt cooling. A shipping container sized unit:
https://www.copenhagenatomics.com/
They are planning on mass producing thorium MSRs, using 5% enriched uranium startup fuel (they would like to use SNF derived MOX startup fuel but the regulators won't let them). They plan on building one/day in a factory. They can get lots of investors, lots of interest, the reactor and factory design is not a problem. The big obstacle is these corrupt regulators. All in countries that proclaim they are in an all out war against climate change & CO2 emissions. Hypocrites, Grifters & Liars. Listen what happens when their investors talk with the Regulators:
Thorium Molten-Salt Reactor, Copenhagen Atomics Onion Core - Thomas Jam Pederson @ TEAC12:
https://www.youtube.com/watch?v=QqxvBAJn_vc
So, in fact, nuclear powered long distance, large shipping is a no-brainer. The key is factory produced SMRs, especially compact units like the one I described. If our political leaders really cared about emissions, climate change, energy security and energy wars, (Hint - they don't), they would make sure these reactors were mass produced in large quantities. At a small fraction of the $7T they've spent on wind/solar/hydrogen/battery storage. With zero results. A miserly 1.1% of Global Primary Energy Supply. Won't even supply the increase in World energy consumption never mind replacing any fossil energy. A total joke.
One thing for sure, anyone builds a Nuclear powered ship, like China is planning, the mercenary NGOs, mass media, labor unions, legal-lobby firms will be go on a rampage trying to block them, with endless lawsuits, unions refusing to unload them, media fear porn campaigns, national boycotts and blockades by corrupt politicians. And, as usual, none of the above will reveal who is lavishly funding them. That's top secret.
China is planning on putting its thorium molten salt reactors on giant container ships. Ten years between refueling vs every few thousand miles. Negligible fuel vs 150 tonnes dirty bunker oil/day.
They are planning ultra-large container ship with a reported capacity of 14,000 to 25,000 twenty foot containers. Powered by a 200MWth, 50MWe reactor. Also planning to develop an sCO2 turbine for it @ 45-50% efficiency, pushing it to 100MWe output. Also would use a 10MW diesel generator as a backup. 40 yr operating life on the reactor.
Watch the mercenary NGOs go berserk trying to block those ships, the same ones screaming about "Global Boiling" and "Climate Change is an existential threat to humanity".
China to Build a Thorium-Powered Mega Ship That Never Shuts Down, BeyondTheBuild
https://www.youtube.com/watch?v=SnrdjJVuNWo
"China has just revealed full specifications for the world’s largest nuclear-powered cargo ship — and it’s a breakthrough that could transform global shipping.
This massive vessel can carry 14,000 containers and is powered by a thorium-based molten salt reactor, capable of delivering steady, high-output energy with far less radioactive waste.
Thorium reactors don’t just cut emissions — they could eliminate fuel costs entirely for long-distance shipping.
And China has taken a major step forward by proving they can convert thorium into usable uranium fuel inside a working reactor, giving the country greater energy independence than ever before.
In this video, we explore:
⚛️ How thorium molten salt reactors work — and why they’re safer
🚢 How a nuclear-powered cargo ship can cross oceans without refueling
📦 Why 14,000-container capacity changes global logistics
🌍 China’s push to bring nuclear tech into commercial transport
💡 What this means for emissions, shipping costs, and energy security
This isn’t just a ship —
it’s a floating nuclear revolution that could reshape world trade."
One dimension I’d be curious to hear you address is the market demand for faster trans-oceanic shipping. As you noted earlier, power demands scale non-linearly with speed, thereby naturally constraining diesel-powered shipping to a more “leisurely” pace. But arguably nuclear propulsion would ease that restriction; does this factor in, especially given the much higher volume of trans-Pacific trade compared to fifty years ago? Or do you see the premium from faster shipment times as being marginal?
You need less total ships if the fleet is moving faster.
Well done, insightful, comprehensive essay!