1) Put a couple of these on trans-Atlantic cruise ships, designed for speed, to make the journey in 3 days (at 50 MPH) carrying 2,000+ people.
2) Cargo ships that operate on the backbone long haul routes. If there are concerns about these getting too close to shoreline or population, just have them only operate 10 miles from land. Other cargo ships can then load and unload them in open water. (This would require some faster loading/unloading mechanism, maybe something where the front would open up and slide out the entire deck into the other ship.)
Thoughts?
Edit: This version does 67mph and is powered by two 25 megawatt engines. https://en.wikipedia.org/wiki/HSC_Francisco
My point is that the power alone can not make a ship faster. Hull length and shape determines max speed.
You mentioned even with unlimited amount of energy and power the speed is still capped and limited by Hull Length and Shape.
This reads to me if I could get a Nuclear Fusion reactor in my ship that has 10 times the power my Max Speed would still be the same. This doesn't sound right to me.
So in other words there's no max speed since we're not talking about fixed power.
Power isn’t what’s important. It’s power per volume/weight. If you have an infinitely dense power source then you can send matter at the speed of light through any medium. Is this really an important point to make?
Edit: Oh I see what’s going on above in this thread. It’s nuanced but I believe the original point was that in the Real World with Real Power Sources you have a Real Top Speed. You can’t just always dump more power into your ship to increase it and the right way to increase the max speed is to control hull dimensions.
Hull speed is a pretty simplistic approximation of the actual physics behind it, but generally the rule holds: A displacement hull cannot exceed its hull speed. What will rather happen is that the bow wave will pile up and eat your energy. It’s actually a problem if a very powerful boat pulls a smaller one, the bow wave on the smaller boat piles up, making the smaller boats bow rise up until the stern slips under the water and it sinks. (Or something else gives in under increasing strain before that happens)
Now, other hull forms can be built: glider hulls for example that glide on the water surface (think fast sports boats etc.), but scaling those up will certainly be problematic if you’re trying to aim for high carrying capacity. Cats/Multi hull designs sort of cheat the physics: the determining factor is roughly the length of the water line and multi hull designs obviously have more waterline for a given total length.
OTOH if it took 3 days probably a lot of people would just stay at home.
Nuclear-powered US military vessels (subs and aircraft carriers, at least) already sail all around the world. I guess they don't enter NZ's 12 mile zone, or get some exemption when they do.
There are 11 known reactors dumped into various oceans and nothing terrible has come about from them.
The major concerns seem to be hijacking/piracy, clearance to dock at ports, and the general umbrella of proliferation concerns.
They don't want people taking these and using the material for bad things.
If there was a way around that, then maybe they would be economical. The cheap fuel costs in the past made the NS Savannah non-competitive, but I doubt that's true now: https://en.wikipedia.org/wiki/NS_Savannah
It takes 3 very difficult achievements to build a nuclear bomb. Access to reactor grade uranium is only one of them.
I'm not sure the dangers of potential proliferation outweigh the tangible deaths per year that result from large ship pollution.
But fission reactors also produce plutonium. Using that is another possibility, but you need very pure Pu239. Once the reactor has been running for over three months you start getting a lot of Pu240, which is a serious contaminant for bomb fuel. Separating those is not currently feasible.
So one expedient for nuclear ships would be to run the reactors a few months in secure conditions before putting them to sea. Reactor-grade plutonium is still rigorously controlled, because it might be possible to make it explode, but nobody has ever done it.
https://www.world-nuclear.org/information-library/nuclear-fu...
The US tested a bomb made from reactor grade Pu in 1962.
> a 1962 US test using UK plutonium from its Magnox reactors had a relatively a high level of Pu-240 but evidently less than ‘reactor grade’ as subsequently defined
That being said, there seems to be "evidence" (maybe more like conclusions that can be drawn from published articles by people with weapons experience etc.) that Pu with almost any isotopic composition can be used to make a usable (as in, very low probability of pre-detonation, low enough radioactivity to not pose a threat to personnel handling it) weapon.
Now, I don't think that terrorist capturing a nuclear powered cargo ship and then making a Pu bomb is a particularly big worry. Making a Pu bomb from spent fuel (whether with weapons grade Pu or reactor grade) requires reprocessing technology (e.g. PUREX) as well as the engineering to create an implosion device, and is probably out of reach for non-state actors.
The worry AFAICS with reactor grade Pu is that an advanced non-weapon state sitting on a big pile of separated reactor grade Pu (cough Japan cough) could relatively quickly (e.g. weeks/months) create a bomb if they so wanted, compared with building weapons grade Pu producing reactors and running them, which would be a several years long project.
https://en.wikipedia.org/wiki/Dirty_bomb
The biggest threat a dirty bomb poses is fear. Meanwhile shipping pollution is estimated to be responsible for hundreds of thousands of deaths every year which we just take as a fact of life.
Burning oil to move goods around the world is not a sustainable long term solution. Nuclear propulsion might be.
A variant of the concept is the floating power plant Akademik Lomonosov, a barge housing 2x35MWe reactors. Though somewhat oddly it's not intended as a mobile power plant, it replaces a "normal" power plant being shut down in a far eastern autonomous district.
Absolutely not. What you're saying is true for nuclear disposal- if you bury nuclear waste under the ocean floor there are no currents and no water table to disturb it, unlike on land where coolant water will rush towards drinking water, smoke does not diffuse evenly, and sediment does not naturally bury heavy isotopes.
It is absolutely not true for an accident. Radionuclides from Fukushima are measurable anywhere in the Pacific ocean. They're all over the planet. That's key though, because such even distribution means that even very dangerous isotopes are very quickly reduced to safe concentrations, or at least lower than background radiation.
On the other hand it is extremely difficult or impossible to save a priority environment if there is a real disaster. Convection will be driving far more radioactive material into the area than a land accident. You're not gonna ever have a meltdown (they already basically don't happen on land), but even a relatively small breach would have the potential to kill an entire area. Over most of the ocean that might be fine, but spawning areas or corals would be huge losses.
The contamination from fukushima is detectable all over the planet just like all modern steel is detectably contaminated from 1960s nuclear testing[1]. It doesn't make it any kind of threat to the environment. We're talking about the same order of magnitude concentrations that are used in radiocarbon dating.
And the very dangerous isotopes you speak of, they have a very short half-life.
See also, the Oklo natural nuclear reactor complete with all the associated waste/contamination and the fact that it had little to no impact on the surrounding environment[2].
At the end of the day, there are 11 known and god knows how many unknown nuclear reactors dumped into the sea, and things have turned out pretty okay. One of them is even a popular dive site.
Again you're describing a sealed or mostly sealed, cold reactor, which is what most spills have been like. That is not what an accident would be like. It's a totally different scenario.
> And the very dangerous isotopes you speak of, they have a very short half-life.
Minutes, hours and days- easily long enough to kill local life outright. My point was that the local effects underwater would be far more disastrous than a similar accident on land, if there is life where the accident happens.
> See also, the Oklo natural nuclear reactor complete with all the associated waste/contamination and the fact that it had little to no impact on the surrounding environment[2].
It was active during the precambrian, and buried underground, which was again the exact assumption of yours that I had an issue with. You are really, fundamentally not understanding what I am saying- a nuclear accident is extremely different from disposal.
You make a sea reactor dump sound like China Syndrome. The fact that 11+ of them happened with no significant problems makes it pretty clear that you're exaggerating.
Microplastics and plastics in the ocean are a far more serious and far more tangible concern than a hypothetically hijacked ship hypothetically dumping the core which hypothetically turns into powder form.
(It’s a joke of course. HN can be sometimes too serious)
Good plan. That's where to put it. The Idaho National Laboratory, formerly the National Reactor Testing Station, is 890 square miles of mostly empty space. For good reasons.
I wonder if there’s a bike shed anywhere in there? If so, it’ll be more than a year to review.
Come on California. Get your act together.
>> NuScale’s reactor is 65 feet tall and 9 feet in diameter, and is housed in a containment vessel only slightly larger. About the size of two school buses stacked end to end, you could fit around 100 of them in the containment chamber of a large conventional reactor. Yet this small reactor can crank out 60 megawatts of energy.
>> The review process is brutal—NuScale submitted a 12,000 page technical application—and will likely stretch on for at least another year. But the company has already secured permission to build its first 12-reactor plant at the Idaho National Laboratory, which may start supplying power to communities in Western states as soon as 2026.