←back to thread

425 points nixass | 1 comments | | HN request time: 0s | source
Show context
kragen ◴[] No.26674832[source]
Nuclear energy is the Amiga of energy sources.

Ahead of its time, it was unjustly rejected and persecuted by the ignorant masses. Its advocates are bonded by the quiet pride that at least they weren't unthinkingly siding with those masses. (And they're right!) Meanwhile, as the Amiga stagnated for terribly unfair reasons, other, scrappier technologies like the i386 and UMG-Si grew from being worthless boondoggles (except in special circumstances, like spaceflight) to being actually far better and cheaper. But the Amiga advocates keep the faith, sharing their suffering and resentment. They inevitably try the alternatives a little and perhaps even start to like them. Gradually their denial recedes, decade by decade.

But they know that however much fab costs go down and leave their beloved Amiga behind in the dust, you'll never be able to run nuclear submarines and Antarctic research stations on solar panels.

— ⁂ —

Wind, where available, undercut the cost of steam power (including nuclear and coal) a decade ago, and PV undercut it in equatorial parts of the world about four years ago, or in even more of the world if you don't include storage. As a result, last year, China, whose electrical consumption has doubled in the last decade, built 48.2 gigawatts† of new photovoltaic capacity last year https://www.reuters.com/article/us-china-energy-climatechang... but only has, I think, something like 10 GW of nuclear plants under construction, scheduled to come online over the next several years. PV installed capacity in China is growing by 23% per year, the same rate it has been growing worldwide for the last few years; with some luck that will return to the 39%-yearly-worldwide-growth trend that has been the fairly consistent average over the last 28 years.‡

(A previous version was posted at https://news.ycombinator.com/item?id=26218673.)

______

† China's PV capacity factor seems to be only about 13%, so those 48 GWp probably work out to only about 6 GW average. It would be nice if China managed to site its new PV plants in places that could provide a capacity factor like California's 28%.

‡ Why 28? Because I haven't found figures yet on what worldwide installed capacity was in 01992 or earlier.

replies(5): >>26675363 #>>26675650 #>>26675994 #>>26677760 #>>26678634 #
legulere ◴[] No.26675650[source]
Your opponents of course seem ignorant if you turn them into straw-men.

There are legitimate concerns against nuclear:

Lack of a proper handling of nuclear waste, which is pretty much impossible given the timeframe.

Weakness to improper handling. Human error is very common and should not be able to lead to catastrophic events.

Weakness to unknown unknowns. Chernobyl and Fukushima haven’t been predicted, we’re not able to see all failure modes.

Usefulness of civilian technology in the spread of nuclear weapons. Just think of why the US keeps Iran from building up a civilian nuclear industry.

Expensiveness. Cost is mostly bound by construction costs, which rose faster than inflation.

replies(3): >>26676143 #>>26676243 #>>26676766 #
sir_bearington ◴[] No.26676766[source]
Waste is easily the biggest straw-man concern there is against nuclear. The entirety of the nuclear waste produced by US nuclear grid electric power generation fits in a volume the footprint of a football field and 10 yards high [1]. We test waster supplies for uranium already because naturally occurring uranium sometimes gets into drinking water and it has to be filtered out [2].

Burying spent nuclear fuel in bedrock, with no aquifer poses zero risk. The only way it's getting out is by deliberate human intervention. Any nefarious group that has the capability of doing this could inflict far more harm by conventional means. And even if it somehow, by some mysterious force, leaks into the water supply we have infrastructure to detect it and filter it.

We dispose of materials far more toxic than nuclear waste on a regular basis.

1. https://www.energy.gov/ne/articles/5-fast-facts-about-spent-...

2. https://www.kqed.org/stateofhealth/120396/uranium-contaminat...

replies(2): >>26676997 #>>26678116 #
kragen ◴[] No.26676997[source]
Hey, aren't you the guy who was saying that solar-powered electric freight trains would only be able to run at night? https://news.ycombinator.com/item?id=26240032

I agree that nuclear waste is probably a manageable problem, but not for the reasons you say. "Zero risk" is not a thing that actually exists anywhere ever. "Bedrock with no aquifer" is a thing that exists, but it's not what you're looking for: the rockhead under a desert, for example, is bedrock with no aquifer, and it's commonly very porous and water-permeable. What you want is impermeable rock that will stay that way, like a salt deposit, which is indeed pretty safe—many salt domes have successfully kept petroleum or natural gas from leaking to the surface for 300 million years or more.

The special difficulty of nuclear waste is not that it's especially toxic—far more toxic materials certainly exist, even commonplace materials like hydrofluoric acid, hydrazine, and tetraethyllead. But if you pour hydrofluoric acid on the ground in most places, it becomes completely nontoxic within a few minutes. Hydrazine loses most of its toxicity if you just set it on fire, although burning it to totally nontoxic materials requires a little more care. Tetraethyllead also loses most of its toxicity when you burn it, though the resulting lead compounds were still toxic enough to cause a worldwide crime wave lasting decades.

What's special about nuclear waste is that no such simple means of detoxification exists. The only way to detoxify nuclear waste is with another nuclear reactor—and that's not only in need of additional development to bring it from the laboratory to production, it's also commonly prohibited because of proliferation concerns.

The real risk with nuclear waste, though, is not that disposing of it safely is rocket science; it's that the people who are in charge of it in countries like the US are the same ridiculous bumbling assclowns who've bungled the covid pandemic so badly. (Did you know that, though China was vaccinating college students last July, 1000 people a day are dying from covid in the US?) Have you read about the cat-litter explosion at WIPP? https://en.wikipedia.org/wiki/Waste_Isolation_Pilot_Plant#20... Someone used "an organic cat litter" in place of "inorganic cat litter" to immobilize the nuclear waste, so it caught on fire.

Fortunately, all of this is moot; as I said, nuclear energy is now so much more expensive than solar energy that there's no longer any reason to use it except in a few special niches, and that's unlikely to change for decades. Enjoy your Video Toaster.

replies(1): >>26677067 #
sir_bearington ◴[] No.26677067[source]
The comment said that solar powered trains would only be able to run at night if wind generation is sufficient to power them in the absence of solar power - at least not without massive amounts of storage to account for this intermittency.

Regardless, I'm not sure why the inability to detoxify waste is such a concern. First of all, we do have the ability to reclaim >95% of it through reprocessing. This isn't detoxification per-se, but does represent a sizeable reduction in the amount of waste. And the remaining waste is stored underground. The danger of uranium entering the water supply already exists from naturally occurring uranium. The additional risk presented by waste buried in a known location, with no groundwater contamination risk is zero. Sure, if you want to be pedantic, it's not exactly zero: some nefarious group could dig it up and use it as a weapon. But any group with that level of capability could easily deal more damage through conventional means - so for all intents and purposes the risk is zero.

replies(2): >>26677625 #>>26683403 #
1. kragen ◴[] No.26677625[source]
Aha, thanks for clearing that up.

I think probably trains will have an easier time carrying batteries than electric cars do: a one-tonne diesel internal-combustion-engine car might get (in medieval units) 40 miles per gallon of fuel, while diesel freight trains routinely get 480 miles per tonne-gallon. Teslas need to recharge about every 500 miles, so we should expect battery-powered electric freight trains with the same battery mass fraction as a Tesla to need to swap batteries roughly every 6000 miles or 10000 km. A night train making it through the night isn't going to be a problem.

If that's true, then why haven't batteries already replaced diesel engines in diesel-electric locomotives? I suspect it's a matter of battery costs and network effects. A gallon of diesel is 146 MJ, so a tonne-mile on a freight train costs 300 kJ, or 189 kJ/tonne/km in non-medieval units. Lead-acid batteries only give you roughly 20 kJ/US$, and low-power lithium-ion batteries are usually more like 10 kJ/US$. You get a multiplier of about 3 because diesel engines are typically about 35% efficient and electric motors are about 95% efficient, so you only need 70 kJ/tonne/km. But 500 km of range would still cost you 175 grand of lead-acid batteries for every 100-tonne railroad car in the train, which more than doubles the cost of the train. If you use lithium-ion instead, it's twice that: US$350k a car. So, expect this to take a significant amount of investment, and therefore take a couple of decades—if it happens at all, because quite possibly it's all-around cheaper to use cheap solar energy to produce ammonia or hydrocarbons and burn those on the train.

The inability to detoxify waste is a concern because detoxifying is what we normally do with hazardous waste. Learning to handle hazardous waste in a different way is risky and will involve some accidents. I mean, it already has.