Coolant in nuclear reactor
A fluid that removes heat generated by nuclear fission in a reactor core, cooling the reactor and transferring heat to steam generators or turbines. Common coolants are water (in pressurised water reactors), liquid sodium (in fast breeder reactors), and molten salt (in some advanced reactors).
Real World
The pressurised water reactors at France's Flamanville nuclear plant use water at ~155 atmospheres as the coolant, keeping it liquid above 300°C so it carries heat efficiently to a secondary steam circuit driving the turbines.
Exam Focus
When asked to 'evaluate' a coolant choice, address heat capacity, neutron moderation effects, chemical stability, and safety — multi-mark questions expect multiple criteria.
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