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Some early and some experimental reactors used sodium as the primary coolant.

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7y ago

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Why is sodium used as a coolant for nuclear reactors?

Sodium is generally used in a type of reactor called a fast reactor, which relies on fast moving neutrons to operate Water cannot be used as a coolant because it slows the neutrons in the reactor too much, whereas sodium does not. As well, because sodium boils at such a hot temperature it does not require a pressurized cooling system unlike water cooling systems.However, unless required, most reactors will not use sodium as a coolant because it is a very reactive element, and as a result special safety measures in construction and operation must be observed.


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