Reactors to think about

An interesting call in the SMH this morning for the government to think about innovative type of reactors if they are going to go nuclear. This article advocates "accelerator-driven" thorium reactors, about which I have read little. They sound promising in several respects:

The beauty of this approach is that the reaction and energy production is only sustained as long as the proton beam is on.

With this type of thorium reactor there is no possibility of fission continuing when the proton beam is off. This means that thorium reactors are sub-critical devices which cannot maintain a self-sustaining chain reaction, and hence there is no chance of Chernobyl-style meltdown.

Australia has abundant supplies of thorium. Unlike uranium, thorium doesn't need significant enriching because it is more than 500 times more abundant in nature than uranium, which should make it cheaper to extract and process.

Thorium reactors produce lower volumes of shorter-lived waste products than conventional reactors. Accelerator-driven thorium reactors do not produce significant quantities of plutonium-239 or U-235 either, so the technology could be supplied to countries such as North Korea and Iran in the knowledge that it could not be used to produce nuclear weapons.

A pretty detailed article from Cosmos magazine gives some more information. It all sounds promising, although I wonder about the reliability of the accelerators that would be needed. If it breaks down, you have no power by the sounds.

Maybe I have to switch allegiance to this type of reactor instead of the Pebble Bed. (Mind you, it sounds to me like Pebble Bed reactors are a lot closer to real testing and commercial application.)

I do think that if nuclear power stations are to be built in Australia, they really ought to go with the most modern concepts, and not simply build an existing model.