NANTeL Plant Systems Overview 3

Question 1

What is the function of the Chemical and Volume Control System (CVCS) in a PWR?

Accepted Answer

To control the concentration of boron in the primary coolant and maintain coolant inventory

Answer

The CVCS adjusts boron concentration for reactivity control, maintains primary coolant volume, and purifies coolant chemistry.

Question 2

During a station blackout, which system provides backup power to safety-related equipment?

Accepted Answer

Emergency diesel generators

Answer

Emergency diesel generators automatically start and supply AC power to safety buses when normal offsite power is lost during a station blackout.

Question 3

What is the primary purpose of the spent fuel pool cooling system?

Accepted Answer

To maintain adequate cooling of irradiated fuel assemblies removed from the reactor

Answer

The spent fuel pool cooling system circulates water through heat exchangers to remove decay heat from recently discharged fuel assemblies.

Question 4

In nuclear plant operations, what does the term 'defense-in-depth' refer to?

Accepted Answer

Multiple independent barriers and safety systems to prevent radioactive release

Answer

Defense-in-depth uses multiple independent safety layers—fuel cladding, primary pressure boundary, and containment—along with diverse safety systems to prevent accidents.

Question 5

What is the function of reactor coolant pumps (RCPs) in a PWR?

Accepted Answer

To circulate primary coolant through the reactor core and steam generators

Answer

RCPs maintain forced circulation of primary coolant, ensuring efficient heat transfer from the reactor core to the steam generators.

(NANTeL) National Academy for Nuclear Training e-Learning Practice Test

(NANTeL) National Academy for Nuclear Training e-Learning Practice Test

NANTeL Plant Systems Overview 3