A) To maintain constant pressure in primary circuit under 9varying load
B) To supply high pressure steam
C) To increase pressure of water in primary circuit
D) To provide subcooled water at high pressure
Correct Answer: A
Solution :
[a] In a nuclear power plant, the reactor is the part of the facility in which the heat, necessary to produce steam, is generated by fission of the nuclei of uranium atom. The produced steam drives a turbine generator, which generates electricity. The nuclear steam supply system is therefore the counterpart of coal, gas or oil-fired boilers of fossil-fuelled plants. In the primary system, the water is heated inside the reactor vessel in contact with the hot fuel assemblies that constitute the reactor core, then passes through thousands tubes of steam generator, and, driven by the reactor coolant pumps, returns to the reactor vessel. A pressurizer keeps the primary system under high pressure, 155 bar, to force the water to remain in the liquid phase and therefore ensure the most efficient heat transfer. Hence the name PWR for pressurized water reactor.
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