Liquid metal coolants are selected for breeder reactors primarily because they_______________?
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Answer: C. transfers heat from core at a fast rate
Explanation
Liquid metal coolants possess exceptional thermal conductivity, enabling extremely rapid heat transfer from reactor cores. High thermal conductivity prevents dangerous core overheating by quickly moving thermal energy away from fuel elements. Fast removal of thermal energy is essential in compact reactor cores operating at very high power densities. Liquid metals like sodium or potassium remain liquid at high temperatures without requiring extreme operating pressures. Thermal conductivity of liquid metals vastly exceeds that of conventional water or gas coolants used elsewhere. Fast reactors require non-moderating coolants to keep neutron energy levels high for efficient breeding processes.
Liquid metals act as poor moderators because their heavy nuclei do not slow down neutrons efficiently. Steam production depends on secondary heat exchangers rather than the coolant directly creating maximum steam inside. Coolants remove heat rather than directly increasing the nuclear reaction rate or breeding neutrons themselves.
- Subject
- Engineering
- Category
- Mechanical Engineering
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- —
- Difficulty
- medium
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