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UK backs Rolls-Royce project to build a nuclear reactor on the moon

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Re: UK backs Rolls-Royce project to build a nuclear reactor on the moon

#91
… but why Rolls Royce?

Also interesting that they didn’t pick a US nuclear company. This is obviously a boon to the contract winner. These decisions always have a political aspect to it. What does this signal?

Edit: wow, massive oversight. I thought this was NASA. Nevermind! Still, the Rolls Royce choice isn’t obvious to me.

Re: UK backs Rolls-Royce project to build a nuclear reactor on the moon

#92

Earlier quoted context omitted.

You're right of course. Bad choice of words. I was meaning the the moon's "Permanently Shadowed Regions" [1] [1] https://moon.nasa.gov/resources/97/the-moons-permanently-sha...

While solar obviously would not work there, is there any compelling reason to need nuclear power in those permadark locations?

I think there is reason on mars - there is a fairly significant source of water there (ice). I guess this wouldn’t explain the moon though.

Re: UK backs Rolls-Royce project to build a nuclear reactor on the moon

#94

I'd still like to know how they plan for a potential explosion of the space craft carrying the fuel inside the atmosphere. They better have a good story on that. Even if the rocket breaks up and the fuel reaches ground in perfectly sealed containers, that still doesn't mean the danger is over.

The fuel doesn't become dangerously radioactive until after the reactor powers up for the first time. The uranium fuel is only about as toxic as something like barium or lead until the chain reaction starts generating fission products.

This is in fact safer to launch than past space missions such as Pioneer, Voyager, and Cassini. Those used radiothermal generators that were far more radioactive and hazardous than a fresh reactor core.

Re: UK backs Rolls-Royce project to build a nuclear reactor on the moon

#95

Earlier quoted context omitted.

It's not that reactors are needed in the permadark regions, it's just they they tend to be very cold and it should be easier to dissipate heat from the reactor.

I thought that it's hard to radiate-away heat in vacuum?

Dump the heat into the ground.

Re: UK backs Rolls-Royce project to build a nuclear reactor on the moon

#96

Earlier quoted context omitted.

The US Navy made a nuclear reactor to power an Antarctic base and it was so expensive and failure prone they went back to diesel. https://theconversation.com/remembering-antarcticas-nuclear-...

This is a funny attempted dunk on US Navy nuclear considering they operate a fleet of nuclear powered submarines and warships.

The benefit of nuclear powered ships/submarines is that they can operate for a very long time without refueling - despite being extremely expensive, that can be a tradeoff the planners are willing to make.

Re: UK backs Rolls-Royce project to build a nuclear reactor on the moon

#97

… but why Rolls Royce? Also interesting that they didn’t pick a US nuclear company. This is obviously a boon to the contract winner. These decisions always have a political aspect to it. What does this signal? Edit: wow, massive oversight. I thought this was NASA. Nevermind! Still, the Rolls Royce choice isn’t obvious to me.

Along with making fancy cars, Rolls Royce is a significant aerospace engineering company well known for their jet engines. https://www.rolls-royce.com/

Re: UK backs Rolls-Royce project to build a nuclear reactor on the moon

#98

I'd still like to know how they plan for a potential explosion of the space craft carrying the fuel inside the atmosphere. They better have a good story on that. Even if the rocket breaks up and the fuel reaches ground in perfectly sealed containers, that still doesn't mean the danger is over.

The same plan as for all the countless cases when they sent radioisotopes in space. Perseverance and Curiosity each have 4.5 kg of Plutonium-238 on board. Did that worry you?

Re: UK backs Rolls-Royce project to build a nuclear reactor on the moon

#99
post #90

This article does not cover what I consider to be two key issues: - how to boost the mass of something like a shielded nuclear reactor to the moon? - how to extract the heat energy from the reactor? turbines (more mass)?

Maybe reduce the shielding requirement by burying it in regolith with only the heat exchangers exposed?
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