Reactivity Control System

 Reactivity control system is shown schematically. The control rods (CRs) are individually supported by control rod driving mechanisms located in standpipes connected to hemispherical top head of the RPV.

 Reactor shutdown is made at the first by inserting 9 pairs of the CRs into the reflectors, and then by inserting the other 7 pairs of the CRs into the active core after the temperature is reduced, so that CRs should not exceed their design temperature limit.

Specification of the control rod system
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