What is the role of cooling water in nuclear power plants?

• A. It is essential for controlling the high temperatures produced in the reactor.
• B. It fuels the nuclear reaction.
• C. It is used to cool the turbine blades only.
• D. It has no impact on safety.

Answer: (A)

Cooling water removes heat from the reactor core, preventing temperatures from rising to dangerous levels. The fuel continually releases heat as fission occurs, and the coolant in the primary loop carries that heat to a secondary system where steam is produced to drive the turbine. Keeping the core temperature within design limits protects the fuel cladding and the reactor structure, maintaining safe operation. After shutdown, decay heat continues to be released, so the cooling system must keep removing that heat to avoid overheating. While water in some designs can also act as a neutron moderator, its primary role is heat removal, not fueling the reaction or cooling only turbine blades. Loss of cooling directly threatens safety by risking fuel damage and potential releases.