Astronomy Magazine

Thorium Plug

Posted on the 27 February 2013 by Andyxl @e_astronomer

As I emerged from my slumbers this morning, I absorbed the latest radio chatter about British Gas – investing wisely, or fleecing the consumer ? All a bit sensitive because of the Government “dash for gas”, what with those EDF Frenchies sueing protesters and so on. (See this Monbiot article). Contrast yesterday morning, when Sue Ion was featured on the rather wonderful Life Scientific. I came across her on PPARC Council when I did my tour of duty – she was a sane and useful voice. (Wommers – get her back !)   She is a stalwart of BNFL, and made a strong case for a mixed energy strategy, with off-shore wind accompanying nuclear. Many greenies are reluctantly backing nuclear – despite its problems,  a window is closing, and we may have no choice.

Meanwhile I am finally reading a book I got for Christmas – Physics of the Future by Michio Kaku. Mostly this is about nanobots and tricorders and ubiqitous computing in our socks and so on, but there is also a chapter about energy, which is distinctly less upbeat than the rest of the book, and indeed may make the rest of the book pointless as civilization collapses. Kaku is a fan of the hydrogen economy, and that may cure us of our oil addiction,  but of course you need an energy source behind it. Kaku assumes that it pretty much has to be nuclear, but starkly spells out the problems – dealing with waste, and nuclear weapons proliferation.

So what puzzles me is – why does nobody ever mention Thorium? Since the 1940s we have known two things. (1) Molten salt reactors have many advantages over fuel rods – no meltdown problem, no high pressures, basically far safer. (2) Using the Thorium fuel cycle has to be the best way to go. You bombard  Th-232 with neutrons and get U-233, which is the fissile material. Thorium is much more abundant than uranium, there is much less waste, the lifetime is much shorter, and there is no weapons grade material for terrorists to steal.

So now we get to the depressing part. That last advantage is why governments are not interested – there is no weapons grade by-product. It seems to be why the US government abandoned this technology in the 1970s. We are ignoring the technology that will save civilization because we want bombs. Hey, wouldn’t it be easy to solve the Iran dilemma ? “We only want nuclear technology for peaceful purposes”. “Okey dokey – here, have this LFTR design. Its dead easy, You don’t need any of those tricky centrifuges! Our guys can come over and help you build it.”

Here is a wikipedia page about the Thorium fuel cycle, and here are two useful web sites about sane nuclear energy : here, and here

Interestingly, the two governments that are investing in this technology are China and India. I feel the future-train whistling past our ears.


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