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Thorium reactors: Asgard’s fire

economist.com

11–20 of 47 posts

Re: Thorium reactors: Asgard’s fire

#11

What about the radioactive waste? All nuclear reactors produce waste (finally when disassembled after the reactors' end of life). I find it strange to search for more efficient reactor styles, while the waste problem is not solved.

the article talks about waste, namely how thorium reactors burn longer lived radioactive elements into shorter lived elements so tens of thousands of years of waste turns into hundreds of years of waste

Re: Thorium reactors: Asgard’s fire

#12

What about the radioactive waste? All nuclear reactors produce waste (finally when disassembled after the reactors' end of life). I find it strange to search for more efficient reactor styles, while the waste problem is not solved.

Most of the waste from traditional reactors is actually unspent fuel. Solid fuel rods only allow for about 1-2% energy conversion before the amount of transuranics and other contaminants built up and prevent safe operation.

The idea of the liquid fueled reactors is that you can easily change the fuel composition, ideally constantly reprocessing the fuel of contaminates, while letting the unburned fuel stay in place. This would drastically reduce the amount of waste generated (by orders of magnitude), and the 'unburnable' waste left over actually has some uses of its own (molybdenum 99 and bismuth 213).

Re: Thorium reactors: Asgard’s fire

#13

What about the radioactive waste? All nuclear reactors produce waste (finally when disassembled after the reactors' end of life). I find it strange to search for more efficient reactor styles, while the waste problem is not solved.

Thorium molten salt reactors make waste reprocessing vastly easier and they produce significantly less "potent" waste products than Uranium solid fueled reactors do. This is important because MSRs could be used to vastly reduce the amount of waste built up so far, easing the storage problem enormously.

Re: Thorium reactors: Asgard’s fire

#14

What about the radioactive waste? All nuclear reactors produce waste (finally when disassembled after the reactors' end of life). I find it strange to search for more efficient reactor styles, while the waste problem is not solved.

It is solved - store it somewhere, or use it as a fuel for other reactors.

And the currently used alternatives (coal) produces way more waste (whole mountains of slightly radioactive, and slightly toxic dust leftovers from coal extraction build up near coal mines).

Re: Thorium reactors: Asgard’s fire

#15
post #5

Earlier quoted context omitted.

Pff. If 'molten salt' reactors are an inch closer in 10 years, I will eat my hat. The idea is only slightly more appealing than having the reactor fly around under it's own power. What makes you think The Economist is interested in probing the nerdosphere? Would Tesla, Apple, etc., be more effective? For sure, the '... adoption is 10 years away' thing is funny. Makes me reminisce for Popular Science. If I were to gue…

Ahem... http://en.wikipedia.org/wiki/Convair_NB-36H ... speaking of flying nuclear reactors

Oh wow, basically its Chernobyl with wings. Don't miss this, its pure gold: http://www.merkle.com/pluto/pluto.html

Quote: "Meanwhile, at the Pentagon, Pluto's sponsors were having second thoughts about the project. Since the missile would be launched from U.S. territory and had to fly low over America's allies in order to avoid detection on its way to the Soviet Union, some military planners began to wonder if it might not be almost as much a threat to the allies. Even before it began dropping bombs on our enemies Pluto would have deafened, flattened, and irradiated our friends. (The noise level on the ground as Pluto went by overhead was expected to be about 150 decibels; by comparison, the Saturn V rocket, which sent astronauts to the moon, produced 200 decibels at full thrust.) Ruptured eardrums, of course, would have been the least of your problems if you were unlucky enough to be underneath the unshielded reactor when it went by, literally roasting chickens in the barnyard."

Re: Thorium reactors: Asgard’s fire

#19
There's a really interesting Ted Talk by Taylor Wilson (perhaps the world's youngest nuclear scientist, and definitely a child prodigy) on thorium reactors as a safer alternative to uranium and plutonium reactors[1].

Apparently there's also this talk[2] by Kirk Sorensen, but I haven't seen that one yet.

[1]: http://www.ted.com/talks/taylor_wilson_my_radical_plan_for_s...

[2]: http://www.ted.com/talks/kirk_sorensen_thorium_an_alternativ...

Re: Thorium reactors: Asgard’s fire

#20
I see this as the main takeaway from the article instead:

> One or two 233U bombs were tested in the Nevada desert during the 1950s and, perhaps ominously, another was detonated by India in the late 1990s. [...] intense gamma radiation 233U produces fries the triggering circuitry

...this only shows that military use is possible! For someone less concerned about safety and more concerned about having a nuclear weapon at all costs, it might be even easier. That triggering circuitry is definitely a solvable problem... brrrrrr

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