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I understand that the Fukushima Daiichi reactors were 40 years old, and are based on a design from the sixties.
I read somewhere (in all of these links) that one of them was due for decommissioning, which might explain why there were fresh rods in the pool. (?)
I understand there are much newer designs which incorporate newer safety features. Mind you, I suspect they'll be changes to those designs, in the light of this mess.
Rgds.
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