Question

Which among the following alkali metal elements is used as coolant in fast breeder nuclear reactors?
 

• A. Sodium
• B. Potassium
• C. Caesium
• D. Lithium

Hint:

Liquid sodium is preferred in fast breeder reactors due to its efficient heat transfer and low neutron absorption.

Answer 1

The Correct Option is A

Step 1: Understand the requirement of a reactor coolant.
A coolant in nuclear reactors must have high thermal conductivity, a high boiling point, and should not absorb neutrons significantly.
Step 2: Analyze sodium as a coolant.
Liquid sodium has excellent heat transfer properties and a very high boiling point. It also has a low neutron absorption cross-section.
Step 3: Conclusion.
Therefore, sodium is used as a coolant in fast breeder nuclear reactors.