this post was submitted on 15 Dec 2024
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[–] [email protected] 17 points 5 months ago (4 children)

So do you still believe in bloodletting to cure colds or the earth being 10,000 years old?

[–] [email protected] 4 points 5 months ago (2 children)

Sure, nuclear energy is valid and all, but you sound like an absolute spanner...

If you want to argue that nuclear energy has its place, maybe don't ridicule people who remember how much of an issue the last major nuclear meltdown was (and partially is).

[–] [email protected] 7 points 5 months ago (2 children)

Fukushima has barely any fall out though, does it. And the nuclear energy sector is moving towards even safer methods with SMRs that are self contained and just can't have a runaway reaction AFAIK

[–] [email protected] 4 points 5 months ago (3 children)

Can't have a runaways reaction like the Titanic was unsinkable.

[–] [email protected] 5 points 5 months ago (1 children)

Well there is a difference between marketing and physics

[–] [email protected] 2 points 5 months ago* (last edited 5 months ago) (2 children)

If you want a reaction that you can take energy away from the reaction, the reaction needs to create more energy than it needs to maintain itself. If you fail to take that energy away, the reaction will accelerate and your output will grow even further.

It is basic physics.

The only alternative would be to have an open system that runs on so little fuel that you need to feed it continuously. This has an entirely different level of problems, as now it will be impossible to contain the radiation to the reaction chamber and the containers of the spent fuel. Also with that you would need an entirely different design of how the radioactive material is held in place and how the reactions are controlled. The current way of adjusting how much you block with control rods probably won't work.

It is just impossible to have an exponential system like the nuclear reactions used in a reactor without active control measures. And active measures can fail.

[–] [email protected] 4 points 5 months ago (1 children)
[–] [email protected] 2 points 5 months ago

A reactivity accident is a situation in which such a control device that absorbs neutrons malfunctions or is accidentally removed for some reason, causing a sharp increase in the nuclear reaction, leading to an output surge and sometimes a runaway reaction. Some SMRs, however, are not confined to the existing light water reactor (LWR) concept of ‘no fuel supply during operation’, but have the concept that fuel supply during operation is possible. Since such reactors are not overloaded with fuel, there is no possibility of a reactivity accident even if there is a failure in the control devices.

Page 4. Describing exactly what i said.

n Japan, where even at 30% power with zero coolant flow, the reactor shuts DON automatically without the insertion of control rods, and heat can be removed without mechanical means by radiation and natural convection to the water-cooled cooling panels outside the reactor. Figure 2.2 shows the results of the zero-coolant test.

The US metal-fuelled fast reactor, the Experimental Breeder Reactor-II (EBR-II, 19 megawatts electrical (MWe)), shows similar results to the above when the coolant flow is set to zero [..] Aurora (4 MWth) by Oklo, which applied for a Combined Construction and Operating License (COL) in 2020, has the same characteristics as the EBR-II.

Page 6, which refers to the graphic on page 7. So this only applies if the reactor was at around 30% or less of the design power output.

Meanwhile, the largest equipment in an NPP is the containment vessel. Containment vessels are generally much larger than reactor vessels. With a diameter of more than 10 m and a height of more than 30 m, they cannot be transported by ordinary means, such as by trucks on public roads. Although a containment vessel is important equipment for preventing the release of radioactive materials in the event of an accident, it is possible to have a design concept without a containment vessel if the NPP has other equipment that has equivalent functions or safety characteristics. The presence or absence of a containment vessel is another guideline for determining whether modularisation can be achieved.

Page 10.

Yeah great idea. This is Titanic all over again. We don't need a last resort because we have been so smart, that all preliminary features are deemed infaillable. A story as old as humans building complex technology.

[–] [email protected] 1 points 5 months ago

i mean, the titanic was also definitionally, not unsinkable, they just called it that.

[–] [email protected] 3 points 5 months ago (4 children)

But Fukushima did render a fairly large area uninhabitable, and the ongoing cleanup is still costing billions every year.

Also, there's still no solution to nuclear waste beyond burying it and hoping that no one digs it up.

Renewables exist, and, combined with upgrading the grid and adding sufficient storage facilities, can provide for 100% of electricity demand at all times. Without any of the risks associated with nuclear power (low as they may be, they exist), and without kicking a radioactive can down the road for hundreds of generations.

[–] [email protected] 3 points 5 months ago

100% minus the energy requirements of AI 🫠

[–] [email protected] 2 points 5 months ago

Uninhabitable? Most of the evacuations were unnecessary, and there would have been less loss-of-life if most people sheltered in-place. In the year following the event, nearby residents received less than 20% of lifetime natural background radiation, about 2 chest CT scans, or a bit more than an airline crew, and less than a heavy smoker.

As for waste, dry casks are plenty good. The material is glassified, so it can't leach into ground water, and the concrete casing means you get less radiation by sitting next to one, as even natural background radiation is partially blocked. Casks are also dense enough for on-site storage, needing only a small lot to store the lifetime fuel use of any plant. A pro and a con of this method is that the fuel is difficult to retrieve from the glass, which is bad for fuel reprocessing, but good for preventing easy weapons manufacturing.

Meanwhile, coal pollution kills some 8 million people annually, and because the grid is already set up for it, when nuclear plants close they are replaced with coal or oil plants.

Upgrading the grid is expensive, and large-scale storage is difficult, and often untested. Pumped hydro is great for those places that can manage it, but the needed storage is far greater, and in locations without damable areas. Not only would unprecidented storage be necessary, but also a grid that's capable of moving energy between multiple focus points, instead of simply out of a plant. These aren't impossible challenges, but the solutions aren't here yet, and nuclear can fill the gap between decommissioning fossil fuels and effective baseline storage.

Solar and Wind don't have the best disposal record either, with more efficient PV cells needing more exotic resources, and the simple bulk of wind turbines making them difficult to dispose of. And batteries are famously toxic and/or explosive. Once again, these challenges have solutions, but they aren't mature and countries will stick with proven methods untill they are. That means more fossil fuels killing more people unnecessary. Nuclear can save those people today, and then allow renewable grids to be built when they are ready.

[–] [email protected] 1 points 5 months ago

Also, there’s still no solution to nuclear waste beyond burying it and hoping that no one digs it up.

what about shit like lead? Or arsenic? That shit doesn't go away, yet we still use it all over the place, maybe not arsenic, but still lead is huge.

[–] [email protected] 1 points 5 months ago

But Fukushima did render a fairly large area uninhabitable, and the ongoing cleanup is still costing billions every year.

ironically, there has been research to determine that a lot of the initial evacuation actually exposed people to MORE radiation, than had they not evacuated, interestingly, they did see an increase in cancer rates, and what not, down the road. However, it wasn't statistically significant compared to other stats from other places.

So even if it did matter, it seems in terms of healthcare, it was a statistical anomaly, more than a concern.

Plus now we have some really cool radiation detecting networks that are volunteer(?) led, it's been a while since i've read into this, but these systems give us a MUCH better idea of what's happening now with radiation, than when it happened. So if it did happen again, the results would be even better.

[–] [email protected] 1 points 5 months ago* (last edited 5 months ago) (1 children)

or the earth being 10,000 years old?

Humanity, or at least written scripture, is roughly 10,000 years old. So if you take humanity = earth, then yes it's approximately true. But also, it's an incredibly egoistic viewpoint because earth is not just humanity.

Edit: by humanity, I mean human culture and not so much human biology.

[–] [email protected] 2 points 5 months ago (1 children)

so basically, if you define a leaf as a caterpillar, it's basically the same thing, got it.

[–] [email protected] 1 points 5 months ago (1 children)
[–] [email protected] 1 points 5 months ago (1 children)

My parents have witnessed not one but two nuclear catastrophes in their lifetime. Wtf are you talking about?

[–] [email protected] 2 points 5 months ago* (last edited 5 months ago)

how many cancers have they witnessed from the likes of coal power? Or things like asbestos? Shit like arsenic, or worse, lead. They probably have a significant IQ drop from leaded fuel, assuming they're american.