Thats why the new CANDU ACR 1000 just use heavy water right in the core. The old ones have huge amounts of heavy water to make it work making them more expensive than the US pwr reactors.
They are nice that they don't use enriched fuel, and can "burn" old nuclear weapon and other lower grade fissile material. Also, if they leak out or overheat, they tend to shut themselves down like Buick said.
You don't see more of them because they cost quite a bit more than the pwr and Canada hasn't been pushing them as strong as they used too. The other problem is some creative scientists in India used one sold there in a modified way to breed nuclear material that can be refined into an atom bomb.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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