Comment on Japanese experimental nuclear fusion reactor inaugurated

EpicFailGuy@kbin.social ⁨7⁩ ⁨months⁩ ago

• deegeese@sopuli.xyz ⁨7⁩ ⁨months⁩ ago

  I’m as much a nuclear skeptic as anyone, but while fusion solves neither the time or budget problems of fission, it does solve the meltdown and waste problems.

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  • ryrybang@lemmy.world ⁨7⁩ ⁨months⁩ ago

    It improves the waste issue, doesn’t really solve it. A dirty, little-discussed secret about fusion power.

    If we had a bunch of fusion plants go live, we’d soon have tons and tons of radioactive containment wall material to bury/store somewhere. Including all the special handling requirements that you need with fuel rod waste. I think fusion plants would actually create more waste than a comparable fission plant, at least as far as tons of radioactive material.

    The benefit is that waste would be lighter isotopes and degrade faster. So you have more physical material to worry about but only need to worry about it for ~100 years, not thousands.

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    • CheeseNoodle@lemmy.world ⁨6⁩ ⁨months⁩ ago

      Still far better than thousands of tons of toxic and radioactive fly ash from coal.

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    • barsoap@lemm.ee ⁨6⁩ ⁨months⁩ ago

      The decommissioning plans for ITER more or less say literally “let stand there as-is for 100 years, then demolish as usual”. Fisson plants, which don’t use less concrete, need to be taken apart small section by small section, each single piece analysed for radiation and sorted into long- or short-term storage. Fusion plants are only marginally more of a headache safety-wise than the radiology department of a hospital and you don’t generally hear people complaining about those.

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  • superminerJG@lemmy.world ⁨6⁩ ⁨months⁩ ago

    The reaction used in fusion generators is:

    [2]H + [3]H -> [4]He + n

    Since tritium is usually produced from lithium in situ, you add:

    [6]Li + n -> [3]H + [4]He.

    The only radioactive thing here is tritium, and it’s mostly confined to the reactor. Also, tritium isn’t nearly as bad as fission waste.

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    • perviouslyiner@lemm.ee ⁨6⁩ ⁨months⁩ ago

      So does this also mean that glow-in-the-dark watches (the non electronic type) get cheaper?

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      • superminerJG@lemmy.world ⁨6⁩ ⁨months⁩ ago

        I mean, if you could extract any tritium from the reactor cavity, but it’s probably going to get burned up instantly.

        The reactions I show add up to this overall reaction. Neutrons simply serve as a catalyst.

        [2]H + [6]Li -> 2 [4]He

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  • sunbeam60@lemmy.one ⁨6⁩ ⁨months⁩ ago

    So does 4 other fission power plants we can imagine. Now sure why we’re so Darwindamned fixated on fusion - I suspect it’s just the name.

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    • deegeese@sopuli.xyz ⁨6⁩ ⁨months⁩ ago

      Fissionable isotopes are yet another nonrenewable fuel.

      Hydrogen is the most abundant element in the universe.

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      • sunbeam60@lemmy.one ⁨6⁩ ⁨months⁩ ago

        With reprocessing, which we already do, and new Gen IV power plants, there’s enough energy to last of thousand of years with currently known resources. And that’s before we start scooping it out of the water.

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