Earlier quoted context omitted.
Ah yes, the usual passive aggressive approach of dismissing contrary ideas that have not been fully confirmed with 100% certainty. And yet you guys never apply this to nuclear.
They're not trying to model a hypothetical technology. They're using hypothetical technological estimates as the input for their model of how much carbon would be emitted.
Nuclear energy is clean
661–670 of 709 posts
Re: Nuclear energy is clean
#662Earlier quoted context omitted.
I do not feel like you are giving me a good faith response, but I am responding in the hope that you are. > So the argument is: because we haven't managed to actually find a long term storage we can make up numbers about recycling and lifetime of the waste? No, that is not the argument. 1) Those lifetime numbers aren't made up. I'm not sure why you would claim so. You can easily check these numbers. (This is why I'm…
> I do not feel like you are giving me a good faith response, but I am responding in the hope that you are. I am trying to give a good faith response, but I feel that the original article is not arguing in good faith and I don't understand your justification. > > So the argument is: because we haven't managed to actually find a long term storage we can make up numbers about recycling and lifetime of the waste? > No,…
Okay, and in that spirit I'll not how I'm interpreting some of your responses. They may not be what you intended but I feel that if I note how I see what you are saying that this can prevent us from talking past one another, which is an easy thing to do accidentally. Let's try to work through this together.
> The lifetime numbers are not made up and I never said the original author was lying.
When you said:
>> we can make up numbers about recycling and lifetime of the waste?
I assumed that it was "make up numbers about lifetime of waste." I'm still having a hard time reading this another way tbh. Would you care to clarify?
> You argued that it was OK to be handwavy because of NIMBY preventing a repository.
No I argued
>>> I'm not sure what other argument they are supposed to make.
Under the condition
>>> without something in place all you can argue is "this problem isn't as hard as people think. We can do it, here's real world examples elsewhere."
I still stand by that. I'm not sure what else you can argue other than "We can do it, here's examples" when there isn't an exact thing in place. I should mention that there are plenty of simulations that show that this is the case. What are we supposed to argue? "Here's an example in the US and that's why we should do it in the US?" That doesn't make sense because we'd then be doing it and wouldn't need to argue in favor of doing said task. I'm still confused what your problem is. Which brings me to
> It is completely unproven that we can do this for 100s of years.
Which again, I'm not sure what you mean. We have simulations. We have small scale testing. We even have medium/long scale testing. The only thing we really don't have is a literal experiment where we've tested this containment for 100 years. But we have for almost 100 years. The likelihood that things become more dangerous after 80 years (from Manhattan project) seems unlikely given literally everything we know about radioactivity and it's nature to reduce in danger over time. So I'm not sure what you're asking for as "proof".
This also is, in my view, silly in the same way it is silly for a recruiter to ask for 10 years of Carbon experience. Carbon is less than a year old, so it is impossible to have 10 years of experience. Though, from personal experience, I've seen this literal argument made by the government to a DoE lab. DoE wanted to improve storage based on simulations and physical testing but the gov said "can't do it because it isn't proven" with "proven" being "full lifetime" physical testing. This is a rather silly, and understandably frustrating, argument. Clearly if you aren't allowed to test something because it isn't "proven" then you can't fulfill the conditions to prove it. The situation is set up to fail and, understandably, make people angry. It is circular logic. If you aren't intending it in this manner, please elaborate because that is how I'm interpreting and I apologize if it isn't the intent. If your intent is to say that we can't have the technology proven until we have a full lifetime example (and thus hundreds or hundreds of thousands of years), please let me know. I will have a followup.
> and at the same time use some hypothetical future development to say the other technology does not have an issue.
Actually, I don't think the author argued anything that wasn't already being done either in another country or through lab scale testing (as in physical testing. Well past simulations).
> What do you mean? Understanding languages that are several hundreds to thousands of years old is not straight forward.
Sorry, I am arguing a different point. Allow me to clarify. I think the premise that literally all human knowledge from now (and previously) will be lost, is a bit naive and an EXTREMELY high bar. While it is something we should be concerned with, it shouldn't be a deal breaker. After all, the bar is so high that it is essentially impossible to meet this bar. We've also got plenty of historical examples to prove that this is unlikely, given that no such event has ever happened and that we also know not to drink water from ancient Roman pipes which are lead lined and who believed that stagnant water was safe. Personally, I believe that if a future civilization is capable of digging miles into the ground and breaking open several feet of steel and concrete, then there's a high likelihood that they also know about radiation. True, it isn't guaranteed, but by the time we were able to achieve such a feat, we also knew about radiation. What I'm saying here is that "worst case scenario" shouldn't prevent us from making steps in the right direction. I'll also argue that this bar is only set for nuclear materials. We produce substantially more amounts of waste with lead and other heavy metals, which are both toxic and *are toxic forever*. At least radioactive materials becomes less dangerous over time (and with exponential decay!).
> I'm talking about that they are obvious targets for terrorist attacks, protests etc..
There's almost a hundred years worth of history on this and we haven't seen a single one. Actually, fun(?) story. A company I used to work for was looking at DoD proposals and we were going to submit one on dirty bombs (well we did). But in the research phase (I have a physics degree and specialized in nuclear) I couldn't find a single case of a dirty bomb actually being used in the wild. This is despite several nuclear weapons and a lot of weapons grade material being stolen/lost after the fall of the USSR. Why? Because it is fucking stupid. Dirty bombs don't increase your kill count. They drastically increase your risk of dying before you deploy your weapon. They also increase your chance of getting caught (there are examples) due to how good we are at sensing radiation. And it is just difficult to get your hand on (and quite expensive). It may increase the terror part of terrorism, but it really just isn't worth it. You could set off thousands of pipe bombs for the price of one dirty bomb.
> Also I recall some experiments or expert assessments for at least the french/German castor containers which showed possible (impropabale but not unrealistic) scenarios that they would not withstand.
Wait, I want to zoom in
> improbable but not unrealistic
What's the bar then? Does it have to be impossible? You have to know that isn't a realistic bar, right?
> The French facility (and I assume Russian one, I don't speak Russian) is much more like a temporary storage, also not proven yet that it will work.
What do you mean unproven? They have successfully stored THE ENTIRE COUNTRY'S RADIOACTIVE LIFETIME WASTE for decades. DECADES. What is unproven?
> I covered recycling already, it is highly uneconomical produces a lot of low rate waste and is only done for political/military reasons in France.
Actually, the reason we don't do it in the US is because it is just cheaper to buy new Uranium. This is not true for France, so they recycle. While it is economically advantageous for France, it isn't for the US. That's besides the point though as fuel is an extremely small part of the cost of the reactor (including waste). But a good reason to do it is to reduce the waste "problem." I REALLY encourage you to read [0] and I find it hard to have a conversation without this per-requisite.
I'm not sure how I moved the goal post tbh, but I will now. To something I feel is actually much more fair. Why does nuclear energy have to be so much safer than other sources of energy? Clearly no source of energy is perfectly safe nor is perfectly green. My question is why nuclear technology has to be leaps and bounds ahead of others. With generations old technology: fewer people die, there's far less environmental damage, it operates at zero carbon emissions, and we've safely stored the material for nearly a hundred years without killing a single person. Hell, we can't say the same about literally any other energy source. After decades of use, in dozens of countries, we've only killed a few hundred people and almost all of those are due to a singular event (Chernobyl) that was at the birth of the technology. Are we not allowed to improve? Are we to be but the sins of our fathers? (bad analogy since that was Russia) Rooftop solar, hydro, geothermal, and natural gas kills more people, so I'm a bit confused. Why does nuclear have so much higher of a bar than any other source of energy? Is it just you don't like nuclear or is there a legitimate reason to the higher bar? Why are we even having this fight? The position is renewables + nuclear not renewables _vs_ nuclear. The point is to get rid of coal, gas, and oil. The situation in Ukraine would definitely be different if Germany didn't kill off their nuclear plants. I honestly don't know what conditions (what level of proof) is needed to convince you. This is why I'm unsure if there is a good faith argument to come from here. If there's no argument that can be convincing then it really isn't good faith.
Re: Nuclear energy is clean
#663Earlier quoted context omitted.
That table doesn't support your thesis, specially when you think of the one reactor being built in France. Something being built means little when the time from "start" and "end" is meassured in decades. A better table would be "increase in nuclear output". E.g. fully self driving vehicles are being built, but little or none see the street, much less have a positive ROI. Planned and proposed is even worse. A lot of t…
>Something being built means little when the time from "start" and "end" is meassured in decades. If you'd go to check for the average build time of a nuclear reactor or the new reactors that come into service you'd notice they're often/typically connected and running 5-6 years after they start building. A lot of that is helped by china and the likes not having horror stories like Finland.
Re: Nuclear energy is clean
#664Earlier quoted context omitted.
> In conclusion, (...) nuclear reactors are simply not going to be built because they are not competitive What do you mean? 50+ reactors are under construction as we write [1], and almost twice as much are planned [2] (with even more proposed). Furthermore: > A nuclear reactor cannot be shipped Marine nuclear reactors (of which 200-ish are in active service) and Chukotka's floating nuclear power plants are notable co…
The capacity of plants built now is about the same as it's being retired. This will only accelerate in the future as old plants get more and more decommissioned. I'm comparison there is almost 300GW of capacity in renewables added every year. All nuclear capacity being built now for the next decades is less than what's added in renewables every year, and that's even considering the capacity factor. So they are not be…
Re: Nuclear energy is clean
#665Earlier quoted context omitted.
Plants planned or under construction will be cancelled anywhere they are not massively subsidized by government coercion of tax- or ratepayers, as energy prices continue downward. They will be recognized as unable to compete. Existing plants will be mothballed as energy prices drop below the level needed to continue operating, again except where coerced.
Nuclear power is the cheapest option: https://www.oecd-nea.org/lcoe/ And it is far more reliable than renewables.
Re: Nuclear energy is clean
#666Earlier quoted context omitted.
The economics of nuclear power don't make it an ideal companion to wind and solar. You want to have backup power for days where it's neither windy nor sunny. So you need a lot of nuclear. But then you want to use renewables when they're available, so most of the time you run your reactors way below capacity. Unfortunately most of the cost of nuclear is capex, so every minute you don't run at 100% makes nuclear power…
That is why companies like Moltex Energy are building a nuclear reactor with a combination of a heat battery. So that they can do 100% utilization and then make massive profit when solar is not there. However that means you are innovating in nuclear and in heat batteries.
Re: Nuclear energy is clean
#667Earlier quoted context omitted.
Here is one from 2015 [1] (I recall some older and more recent ones, but can't find them right now). IIRC they rely on a number of strategies (not necessarily all in the same story) : 1. A much better interconnected frid 2. Overcapacity in both wind and solar, but particularly wind. 3. Operate e.g. heatpumps during times with lots of energy available to heat or cool coolant. 4. Adjust energy intensive industries to p…
Thanks! I’ve still to read the article (hopefully I can find the full text somewhere) but looks like instead of batteries they’re proposing heat-based energy storage (and radical energy use reduction). Edit: The study you linked to actually just summarises another study (in about as many words as I did above): Jacobson, M.Z., M.A. Delucchi, M.A. Cameron, and B.A. Frew, 2015. A low-cost solution to the grid reliabilit…
Re: Nuclear energy is clean
#668Earlier quoted context omitted.
It's essentially impossible for anything that drives a steam turbine to generate electricity to get that cheap. Just the cost of the steam parts, if everything else was free struggles to compete with solar today. Distributed solar also avoid transmission costs, at a certain point a point source of free energy gets outcompeted by distributed solar. So nuclear might have niches, or exciting new applications but is most…
I read this opinion in that blog of Austin Vernon that made the HN rounds about a year ago [1]. In the end his argument is basically "if some energy generation method has moving parts, it has to be more expensive that one that doesn't". But let's look at the numbers. Here's a study by the EIA that looks at the capital costs and also at the Operating and Maintenance costs of various types of power plants [2]. The cost…
Transferring heat across a solid/fluid interface is kind of expensive. The more of that you have to do, the more expensive your power plant will be.
A simple cycle combustion turbine involves no heat exchangers at all. Heat is generated in the compressed air by combustion; the waste heat is carried away in the air + combustion products exiting the turbine. A combined cycle plant does have a boiler and a condenser for the steam section, but that part is only producing 1/3rd the power.
For nuclear to get cheap we'd need something like an open air Brayton cycle, but that would involve running air either through the reactor or through a high temperature heat exchanger made of silicon carbide.
It's interesting (well, to me) to consider how much easier that sort of open cycle system would be on Titan, where one could use 90K N2 rather than 300K air as the input fluid. Titan may be the best place in the solar system for nuclear power.
Re: Nuclear energy is clean
#669Earlier quoted context omitted.
The big con for a solar/battery grid isn't the cost, it's the raw materials. We need an absurd amount of copper/lithium/cobalt etc.. and we need to be mining orders of magnitudes more than we do now.
That is not a proven fact. We probably need more silicon for the solar cells. But there is nothing about lithium ion batteries which makes them our only good choice for storing energy from renewables. Gravity is probably our best energy storage at present, there is also nickle metal hydrade for home storage, and in the near future we are probably gonna be looking at molten salt batteries (e.g. calcium-antimony liquid…
Re: Nuclear energy is clean
#670A good estimate to gauge the societal investment needed to generate electricity in a certain way, is to look at its total cost in dollar/MWh. Wikipedia has a nice graphic prepared for just that: https://en.wikipedia.org/wiki/Cost_of_electricity_by_source#... (which ignores externalized costs like CO2 or nuclear waste) You can see in there that nuclear has triple the cost compared to solar. As we need to replace as mu…
No one is saying that they don't have problems. What they are saying is that they have less problems than the alternatives. In your example: when there's clouds and the wind doesn't blow, what happens? Currently we burn coal, gas and petrol. This means that in order to accept hydro and solar as the main source of energy, we have to take fossil fuels along, as a backup. Unless we find a different backup. And nuclear i…
Or you use some even cheaper (but more complex) combination of various storage solutions, transmission, and demand dispatch.