GK
NUCLEAR SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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saturated steam
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saturated water
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sub cooled water
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superheated steam
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Detailed explanation-1: -As mentioned before, light water is used as the coolant and moderator for a pressurized water reactor. Light water is much more abundant than heavy water, as it makes up 99.99% of natural water.
Detailed explanation-2: -Coolant. Light water is used as the primary coolant in a PWR. Water enters through the bottom of the reactor’s core at about 548 K (275 °C; 527 °F) and is heated as it flows upwards through the reactor core to a temperature of about 588 K (315 °C; 599 °F).
Detailed explanation-3: -A substance circulated through a nuclear reactor to remove or transfer heat. The most commonly used coolant in the United States is water. Other coolants include heavy water, air, carbon dioxide, helium, liquid sodium, and a sodium-potassium alloy.
Detailed explanation-4: -The core of a PWR is filled with water, pressurized to 150 atm, allowing the water to reach 325°C without boiling. Containing this high pressure over the volume of the core presents, one of the major engineering challenges in PWR design.