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OKIsItJustMe

(21,647 posts)
6. As I said, complex systems are prone to failure
Fri Aug 15, 2025, 11:16 AM
Aug 15

However, consider the fundamental difference between Reactor 2 at Three Mile Island.and a "Pebble-Bed Reactor.”

At Three Mile Island, the reaction was meant to be moderated by a combination of “control rods” and circulating water. When the water stopped circulating, stopped cooling the reactor, it overheated.

In the Pebble-Bed reactor, instead of having “control rods” the fuel is encased in spheres of graphite. The reactor is cooled by gas. If the gas stops circulating, it will get very hot, but it will not "melt down."

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