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What happens to the rate of a nuclear reaction when the control rods are lowered into the fuel rod assembly of a nuclear reactor?
Wiki User
∙ 14y ago
In general, if we lower the control rods, the rate of nuclear reactions decreases. The control rods are neutron absorbers, and lowering them will push them into the upper area of the core where fissions are occurring. The neutrons released during these fission events may be absorbed by the control rods that have just been lowered into the vicinity. This will cause the rate of fission to go down.
Wiki User
∙ 14y ago
Wiki User
∙ 14y agoIt is the boron-10 isotope that strongly absorbs slow neutrons. The capture of a neutron gives an excited isomer of boron-11 that quickly decays into lithium-7 and an alpha particle, which will be retained in the control rod material. Other materials have been used to absorb neutrons but mostly I think in small test reactors. PWR and BWR types use boron carbide. AGR gas cooled reactors use a boron steel alloy.
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