Water is a better coolant than a gas (like CO2, He, N2 etc.), because it_________________?

Correct answer: D. All A., B. and C.

  • A. Is a better neutron moderator as well
  • B. Require comparatively smaller pumps and heat exchanger for a given heat transfer rate
  • C. Has a better heat transfer characteristics, and it can be pressurised to attain a high temperature
  • D. All A., B. and C.

Explanation

Water has much higher density, heat capacity, and heat-transfer capability than gases, so smaller equipment can handle the same duty; pressurisation also permits high-temperature operation. It is additionally an effective neutron moderator, making all three statements valid.

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