this post was submitted on 20 Sep 2023
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submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/[email protected]
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https://www.energy.gov/ne/articles/nrc-certifies-first-us-small-modular-reactor-design#:~:text=The%20U.S.%20Nuclear%20Regulatory%20Commission,use%20in%20the%20United%20States.

https://en.m.wikipedia.org/wiki/United_States_naval_reactors

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[–] [email protected] -4 points 1 year ago (7 children)

The biggest, best argument against nuclear energy is the limited fuel supply.

If the world replaced base load power with nuclear (as a nuclear plus solar plus wind energy mix) we would only have enough uranium for something like 50 years

The waste storage problem isn't worth it for so little time, but OTOH we need to solve the storage problem anyway, and 50 years of CO2 clean power would be useful for aiding decarbonising the energy supply

[–] [email protected] 6 points 1 year ago* (last edited 1 year ago) (1 children)

  1. spent fuel can be recycled and it isn't a terrible complex process to do so

  2. even if we didn't recycle spent fuel there's far more than 50 years worth left on land

  3. even if we ran out of land sources spent fuel there's 4.5 billion tons of uranium dissolved in the ocean

[–] [email protected] -1 points 1 year ago (2 children)
  1. Doesn't that require breeder reactors? They're a nuclear proliferation risk, so can't really be allowed in untrusted countries
  2. I think the 50 year number excludes resources that are unavailable, for example an enormous uranium deposit in Australia, which cannot be extracted because the indigenous owners of the land have traditions about the area which make it untouchable
  3. Extracting elements from sea water is stupidly expensive
[–] [email protected] 2 points 1 year ago* (last edited 1 year ago)

  1. no, just simple reprocessing. Breeder reactors are even better and can generate fuel from u-238, but wouldn't be necessary for several centuries at least

  2. I think the 50 year number comes from anti nuclear activists, there's about 8 million tons of uranium out there only considering proven reserves, if we restarted prospecting we could find more

  3. if you're desalinating anyways and reprocessing spent fuel you don't need much, the average nuclear plant needs 27 tons per year per 1000 MW of capacity, and 95% of that can be recycled without breeder reactors

[–] [email protected] 1 points 1 year ago (1 children)
  1. No, not breeders, but reprocessing. There is still a lot of usable fuel left in an "expended" fuel cell, just not in enough concentration.
[–] [email protected] 1 points 1 year ago

If I remember correctly non-viable fuel ratio is anything under 95% pure.

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