Off the Siberian coast, not far from Alaska, a Russian ship has been docked at port for four years. The Akademik Lomonosov, the world’s first floating nuclear power plant, sends energy to around 200,000 people on land using next-wave nuclear technology: small modular reactors.
This technology is also being used below sea level. Dozens of US submarines lurking in the depths of the world’s oceans are propelled by SMRs, as the compact reactors are known.
SMRs — which are smaller and less costly to build than traditional, large-scale reactors — are fast becoming the next great hope for a nuclear renaissance as the world scrambles to cut fossil fuels. And the US, Russia and China are battling for dominance to build and sell them.
One of the less widely discussed issues with nuclear is that the bigger plants are all somewhat unique in their engineering particulars, which makes it more costly to maintain them. SMRs can be more readily standardised, which is expected to improve their economics as well as their cost to maintain.
This is only partially true, France for example has standardized its reactors in the past, with a lot of success, and is planning to do it again for the new projects which are planned in the 2030s. Now it was done in the past with little care for local populations and so on, so we’ll see how it goes. What is true though is that standardization also makes sense when there is a repetitive market foreseen. New nuclear project tend to be announced in small numbers, due to the difficulty of investing so much capital at a time, which makes standardization difficult. Smaller reactors may help, but I remain sceptical with the tech.
If I’m not mistaken SMRs also handle power demand shifts better and don’t have to just do a base load. Something very useful with the growth of renewables and how they are not always supplying power.
I doubt it. Unless they have power storage of some kind, like SSR designs where they use a thermal battery of some kind.
The fundamental issue with nuclear power is that it produces a fixed output (which falls over time) which cannot be managed. Aside from just deleting what would otherwise be power (which is where the power storage comes into play)
It’s not impossible though, but then again it’s not impossible for any nuclear plant to store energy.
The small reactors on submarines can maneuver very quickly without causing fuel damage. Less power per core = less heat generation. Large reactors are limited by flux rate because they can have such high localized heating during maneuvering which has the potential to damage fuel. In that sense, SMRs could raise and lower power to meet demand or even operate on full power/standby basis like what gas plants offer during peak load.
I can’t speak to the strategy of an electric utility using SMRs, but to your point, I would think the idea would still be base load. Build a site with the potential for more SMRs to be built to meet demand in the future.
ok so i get what you’re saying here.
But there is a fundamental thing with nuclear power, where the “burn up” of nuclear fuel doesnt change. In a submarine it doesn’t matter because you’re backed by a military force and you use 70-80% or 90+% enrichment, where as on land we have 3-5% upwards of 20% for the higher enrichment stuff these days i believe.
In the water its about safety and ensuring power production, on land it’s about ensuring reliable and efficient power production. The only beneficial way of doing this is electricity storage. If you’re nuclear reactor isn’t producing power and has fuel, you are quite literally burning money. Think about it like diverting gas/coal input into a gas/coal fired power plant when power demands lower, as opposed to just lessening the consumption.
But yes it would be about 100% baseload first and foremost, everything else is a future concern, eliminate as much static load as you can and then deal with the rest in other manners.
Yeah I’m with you. I have a senior license at a US nuclear plant just for some background as I don’t know yours. What I’m saying is that I can see value of multiple, say 300MW SMRs at a single site, that can go from 0-100% very quickly compared to current 900-1100MW reactors. So the idea would be you could have a plant in Mode 3 Hot Standby ready to raise power for peak loading. Ideally you’d have at least one reactor online at all times that provides its own in house loads and the standby in house loads that would be quite low. That is the value I see.
The issue at that point would be refueling and maintenance outages. It seems ideal that the design would need to support online refueling and enough loops/system availability to do the majority of plant maintenance online. In addition, the regulatory landscape has a lot of momentum to allowing plants to move to risk informed tech specs which allow for major equipment outages in modes of applicability. If the industry as a whole can agree on a handful of SMR designs with multiple capacity options, it really could be a stop gap to hopefully fingers crossed fusion power in, I don’t know, 50-100 years from now? My two cents.
That is a particular type of reactor that is in testing.
https://www.forbes.com/sites/scottcarpenter/2020/08/31/bill-gates-nuclear-firm-says-new-reactor-can-backstop-grid-with-molten-salt-storage/?sh=d81c7c55e65c
Renewables being unable to do base load is just a myth that has been debunked countless times.
renewables can theoretically do baseload. The problem with renewables is that they don’t really have a good pairing with something that would make it SIGNIFICANTLY easier to do.
Nuclear and solar power would make a great pairing for summer time midday peak draws for example. Wind is a good supplementary source. Hydro is a good stored energy source.
You can definitely do full renewable but it will still inevitably be better complimented by some form of baseload plant (i.e. nuclear)
I’ve love for just one of the people anonymously downvoting to chime in. What you wrote is completely accurate but every nuclear-themed post here and on Reddit is downvoted without anyone putting forward a counter-argument.
here https://www.pnas.org/doi/full/10.1073/pnas.1610381114 we can talk about this, feel free to put forward counter arguments, the gist of the cited paper is that previous studies claiming 100% renewable baseload is possible requires sketchy manipulation of the expected demand as well as currently unavailable storage technology on an almost impossible scale. We’re working on all kinds of storage solutions but the reality is we’re not there yet. I’m rooting for molten salt storage or compressed gas storage rather than ramping up more lithium battery storage. Flow batteries are promising as well, but in any case we won’t have enough storage or transmission capability to have a 100% renewable baseload in the next couple of decades.
Looks like someone beat me to it :)
“In sum, Clack et al.’s analysis is riddled with errors and has no impact on Jacobson et al.’s conclusions.”
https://www.pnas.org/doi/10.1073/pnas.1708069114
Surely there wouldn’t any astroturfing be going on here, would there?
I don’t think it’s astroturfing, it’s just cognitive dissonance. Lots of people were raised thinking that nuclear power was the future and they can’t let go of that. That’s why they downvote without commenting - there’s no factual case for new nuclear and that goes double for SMRs.
there absolutely is. It’s a good transitional source of power that we currently understand very well, and know how to manage, but simply cannot build. It would be a very prudent way of ensuring some “insurance” time before fusion starts being even remotely viable.
Although i don’t think SMRs are the correct answer here.
Not with the design and build times new nuclear has. It can take 10-15 years to build a plant, and during that time costs will usually spiral and schedules will slip. At the same time, renewables and storage will have gotten even more competitive.
this is true, but nuclear plants are slated to run for 30-50 years. France has been running their existing fleet to 50 years with maintenance extensions.
There was a recent plant vogtle, i believe, that was finished. Although if im not mistaken i think they just stopped midway through that one, it is up and running right now though last i checked, maybe not generating power yet but definitely running.
I’m guessing you’re referring to the flammanvile reactor project in france? If so thats an EPR design, which are horrendously complicated, and the vast majority of the issues present in the construction are the inability to pour concrete correctly, and the inability to weld correctly. Which is something that happens after 30 years of not building any nuclear plants. We quite literally just have to build more if we want to be able to use it.
It’s true that renewables are more competitive, but solar requires significant power storage figures, which can be problematic at best. Or require other production methods to take up the slack. Wind is quite good, but has the significant problem of waste. Turbine blades are a huge mess. That’s mostly due to industry pressure to make it profitable, and the push for it to succeed, which nuclear hasn’t seen. Nuclear just needs the same thing.
No, it’s because it’s an off topic tangent. We’re talking about SMRs doing not-baseline. Not renewables doing baseline. The very fact they brought it up is indication of binary thought patterns like team sports thinking. “They are for this one thing I don’t like, therefore they must be against the thing I do like!” kind of thing. False dichotomy.
Apparently it’s also false on top of that. Go figure.
Can we not standardize the big ones? Their only dependent factor is a big enough water source for cooling, right? Everything else is just land space and supplies.
I think the scale of the projects and the amount of time it takes to build gives people time to work things in to the plans. I also imagine it’s affected by the local supply chain.
That being said I’m more on the fence about them after reading about some of the challenges involved in making them economical. Can you imagine a factory recall on a reactor part? And that’s not even talking about nuclear waste disposal which we still haven’t figured out reliably beyond “stick it over there and hopefully it won’t be a problem for a few hundred years.”
They also depend on a final nuclear disposal site.
The construction projects themselves also typically require upgrades to local infrastructure. I live near the failed nuclear project in SC and they had to upgrade rail infrastructure near my town, they had to build multiple new bridges over the railroad because the clearance wasn’t high enough for some of the prefabricated components that had to be transported to the site by rail, etc.
Yes and no. Currently the rules around nuclear plants are so strict that each installation becomes bespoke, because small changes that are the reality of construction need to get reapproved.
If regulatory bodies were more open to approving acceptable ranges, or being proactive in the design process we could have more standardized designs.
you absolutely can, problem is it’s just as hard as doing it with SMRs if not harder lol.
I think one of the differences is where the construction happens. SMR should be able to come from the factory in more complete modules, vs assembling everything in the field. While it could never do the volume to make it mass production, in theory you could get similar benefits from automation, repetition, controlled environment, etc. Meanwhile site assembly should be corresponding simpler
They have only one small drawback, which is that they’re nothing but vapourware.
Sadly! I’m not in this field but I had a professor at uni who was involved in these. I wish they were more prevalent
And why do you think they’re not?
What I’m trying to say is that I’m a fan of the concept despite not being an expert.