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3. Reactivity control
Reactivity is controlled by three different physical systems:
a system of control rods inserted according to piloting requirements, supplemented by a system of control rods to maintain reserves in hot shutdown situations;
an automatic system for rapid insertion of anti-reactivity agents by injecting nitrogen from beneath the core. In a first step, carbon dioxide is flushed out of the 163 channels located in the interstices between the fuel channels, then in a second step, from a new supply, all the channels in the core are filled. This system can keep the core subcritical for several hours;
a manually triggered system for injecting 3 mm-diameter absorbent beads. The beads are introduced from above, pushed by carbon dioxide, and fill 32 channels in the gaps between the graphite...
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Reactivity control
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