Safety rods provided in nuclear reactors to guard against accidents, in case of earthquake are made of___________________?
Correct answer: D. Boron or cadmium
- A. High carbon steel
- B. Molybdenum
- C. Zircaloy
- D. Boron or cadmium
Explanation
Emergency safety or shutdown rods use strong neutron absorbers such as boron or cadmium, allowing the fission chain reaction to be rapidly reduced during an earthquake or other accident. Steel, molybdenum and Zircaloy are structural or cladding materials rather than standard absorber choices.
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