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In most stationary pebble-bed reactor designs, fuel replacement is continuous.
Instead of shutting down for weeks to replace fuel rods, pebbles are placed in a bin-shaped reactor.
A pebble is recycled from the bottom to the top about ten times over a few years, and tested each time it is removed.
When it is expended, it is removed to the nuclear waste area, and a new pebble inserted.

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