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At high temperatures, which material is the best choice to be used as coolant in a nuclear reactor?

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in Engineering Physics I by (558k points)
At high temperatures, which material is the best choice to be used as coolant in a nuclear reactor?

(a) Water

(b) Heavy water

(c) Molten Potassium

(d) Molten Carbon

The question was posed to me in final exam.

I'd like to ask this question from Nuclear fission & Nuclear Reactor topic in chapter Quantum Physics of Engineering Physics I

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The correct option is (c) Molten Potassium

To elaborate: Water and heavy water are good coolants, but due to their low boiling points, they need pressurization. At high temperature, liquid metals like molten sodium or potassium are excellent coolants.

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