Live data from Hacker News

Rolls-Royce plans mini nuclear reactors by 2029

bbc.co.uk

21–30 of 353 posts

Re: Rolls-Royce plans mini nuclear reactors by 2029

#21
Personally I'm all for having mini reactors if it means we can generate reliable energy with minimal pollution. Anything that helps reduce emissions should be considered.

But this would need to be a fail save type of reactor and with a clear plan(s) all the way down to how the waste is handled till it's no longer active.

Re: Rolls-Royce plans mini nuclear reactors by 2029

#23

I've been thinking about this for a bit and had a similar model in mind. You build small nuclear reactors in a containers - similar how Google builds their DC. You find an abandoned coal mine shaft and put them deep in the ground. The cost optimizations come from: - economies of scale - no decommission costs - you just leave them to decay. - fewer security measures.

Wouldn't you need a water supply for steam turbines? And if there's water in your mine, it seems like it could transport radioactive particles out.

Re: Rolls-Royce plans mini nuclear reactors by 2029

#25
post #18

Earlier quoted context omitted.

If it were a radioisotope thermoelectric generator, then probably yes.

I don't think that would generate enough power for a car. See maximum output of some here: https://en.wikipedia.org/wiki/Radioisotope_thermoelectric_ge...

Sure it would. Couple it with a lion - battery as a buffer. A tiny pellet gives 60 watts of heat. A heat cycle engine could recover maybe 10 watts of that. Put 500 pellets in there and you could get 5kw or so electric charge, all the time.

Of course the pellets are insanely toxic in just about every way.

Re: Rolls-Royce plans mini nuclear reactors by 2029

#26

>Environmentalists are divided over nuclear power, with some maintaining it is dangerous and expensive, while others say that to achieve net zero emissions by 2050 all technologies are needed. Yes, a mix of technologies. But there's more to it than that. We're going to need increasing amounts of power in the future to explore the solar system and to solve all kinds of existential problems. Energy usage is not inheren…

baby steps I'd say. Let's first fix all the mess we are making here on earth before thinking of space exploration.

Re: Rolls-Royce plans mini nuclear reactors by 2029

#28
post #21

Personally I'm all for having mini reactors if it means we can generate reliable energy with minimal pollution. Anything that helps reduce emissions should be considered. But this would need to be a fail save type of reactor and with a clear plan(s) all the way down to how the waste is handled till it's no longer active.

TerraPower [1] seem to have a good alternative with its Traveling Wave Reactor. It can be run on nuclear waste we already have and provide energy to 10bln people with US per capita power consumption for basically eternity.

[1] https://en.wikipedia.org/wiki/TerraPower

Re: Rolls-Royce plans mini nuclear reactors by 2029

#29
Sure why not, but let us not get carried away and think THIS is the solution to global warming. It is unproven, it will be too late, and not scale up quick enough.

By unproven I mean that the economics of it is unproven. We have no proof that SMR will be cheaper than large reactors. The article points this out as well.

By late I mean at current fast pace of development a lot of will happen with wind and solar in the 10 years it will take for this to get online.

Re: Rolls-Royce plans mini nuclear reactors by 2029

#30

Nuclear reactors' biggest drawback is the cost and danger of dismantling and disposing of them after their working life is finished. Up till then they are clean and cost-effective.

https://world-nuclear.org/information-library/nuclear-fuel-c...
Post reply on HN