The most commonly refered to type of unmeltdownable reactor is the pebble bed reactor:
http://en.wikipedia.org/wiki/Pebble_bed_reactor
Please remember, proponents of nuclear power are not claiming that nuclear power is 100% safe. They are claiming that nuclear power is the only climate independant source of consistently large power output that better than coal.
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And if you say to me tomorrow, oh what fun it all would be.
Then what's to stop us, pretty baby. But What Is And What Should Never Be.
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