What is a heat sink in a nuclear power plant, and give two common examples?

What is a heat sink in a nuclear power plant, and give two common examples?

• A. A heat sink is a device that stores energy without releasing it.
• B. A heat sink is a device that generates heat to power the reactor.
• C. A heat sink cools the surrounding air to maintain ambient temperature.
• D. A heat sink absorbs heat removed from the reactor; examples include cooling towers and rivers.

Answer: (D)

A heat sink in a nuclear power plant is a path that absorbs the heat removed from the reactor and releases it to the environment, keeping the system from overheating. The reactor’s heat is carried away by the primary coolant and transferred to a secondary circuit, and the heat sink is what ultimately dumps that heat outside the plant. Two common examples are cooling towers, where heat is dissipated to the atmosphere mainly through evaporation, and a nearby river (or another large body of water) used for cooling. The other ideas—storing energy, generating heat, or simply cooling the surrounding air—don’t describe the role of a heat sink, which is to transfer reactor heat into the environment.

A heat sink in a nuclear power plant is a path that absorbs the heat removed from the reactor and releases it to the environment, keeping the system from overheating. The reactor’s heat is carried away by the primary coolant and transferred to a secondary circuit, and the heat sink is what ultimately dumps that heat outside the plant. Two common examples are cooling towers, where heat is dissipated to the atmosphere mainly through evaporation, and a nearby river (or another large body of water) used for cooling. The other ideas—storing energy, generating heat, or simply cooling the surrounding air—don’t describe the role of a heat sink, which is to transfer reactor heat into the environment.