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 - Persistence Pays Off - by Sam Grice. About a year ago I was driving down Hwy 36 south of Houston and I saw an old John Deere H sitting in a field with the planters and cultivators still on it. It appeared that it hadn't run in some time, but I stopped and went to the farm house and asked if the tractor was for sale. The lady of the house who answered the door offered no answer, but said that she would talk to her husband and have him call me. I figured he was away at the time. Well I heard from him the next day, and he procee
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