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 Mud Daubers and the Old John Deere - by Jon Zehnder. I have a 1941, John Deere Model A tractor I have owned for about a year and a half. This is my first (in case my wife reads this, "FIRST") tractor and it has been a learning experience. After considerable advise and assistance from local tractor nuts and the forums of Yesterday�s Tractors, I had finally got it running pretty well. I have tuned it up, overhauled the carburetor, installed a borrowed, rebuilt magneto, installed a new Power-Trol, patched the radiator, installed new front wheels a
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