NANTeL - National Academy for Nuclear Training e-Learning Nuclear Plant Systems Overview Questions and Answers

Question 1

In a Pressurized Water Reactor (PWR), what is the primary function of the steam generator?

Accepted Answer

To transfer heat from the primary coolant loop to the secondary loop, creating steam.

Answer

To use steam to spin the turbine-generator.

Answer

To condense steam back into water after it passes through the turbine.

Answer

To control the rate of the nuclear reaction by absorbing neutrons.

Question 2

A control room operator observes a gradual, unintended decrease in reactor power in a Boiling Water Reactor (BWR). Which of the following system changes could be a direct cause?

Accepted Answer

A decrease in recirculation flow, causing more steam voids in the core.

Answer

An increase in feedwater temperature.

Answer

A decrease in the speed of the turbine.

Answer

An increase in recirculation pump speed.

Question 3

Which of the following best describes the primary role of the Emergency Core Cooling System (ECCS)?

Accepted Answer

To provide cooling to the reactor core to prevent fuel damage during a loss-of-coolant accident (LOCA).

Answer

To provide power to the plant during a station blackout.

Answer

To cool the spent fuel pool during normal operations.

Answer

To filter radioactive particles from the containment atmosphere after an event.

Question 4

What is the principal function of the containment building in a nuclear power plant?

Accepted Answer

To serve as the final barrier to prevent the release of radioactive materials into the environment during an accident.

Answer

To house the main turbine and generator.

Answer

To act as the primary operational control center for the plant.

Answer

To store new and spent nuclear fuel.

Question 5

In the context of a nuclear power plant's secondary system, what is the direct function of the main turbine?

Accepted Answer

To convert the thermal energy of steam into mechanical rotational energy.

Answer

To pump water back to the steam generator.

Answer

To condense steam into water.

Answer

To generate the magnetic field for the electrical generator.

Question 6

During a plant tour, a new employee asks why the water in the primary loop of a Pressurized Water Reactor (PWR) doesn't boil, despite being at a very high temperature. What is the correct explanation?

Accepted Answer

The water is kept at a very high pressure by the pressurizer.

Answer

The water is a special type that has a much higher boiling point.

Answer

The flow rate is too high for bubbles to form.

Answer

The control rods absorb the excess heat that would cause boiling.