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Control rod materials
2

Control rod materials

Control rod materials

(OP)
What are the most common materials used? How important are Ag-In-Cd alloys in control rods? Have they been superceded by other materials in newer designs?

RE: Control rod materials

2
In my experience with BWRs, boron carbide (b4c) powder in tubes; once the boron absorbs a neutron, it is "used up"; newer designs use hafnium, because after absorbing neutrons, it becomes other isotopes of hafnium that are also good neutron absorbers.

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