Containment

Question 1

What will cause an SI?

Answer 1

1. Lower containment pressure high. 1.0 psig.
2. Pressurizer pressure low low. 1775 psig.
3. Steam line differential pressure high. 100 psid.
4. Steam line pressure low. 500 psig.
5. Manual SI actuation.

Question 2

What are the three functions of containment?

Answer 2

1. To limit the release of radioactive fission products to the environment under conditions that would result from the largest credible energy release following a loss of coolant accident.
2. Provide biological shielding for personnel protection during normal and accident conditions.
3. Provide a means of testing the leak-tightness of the containment vessel and penetrations.

Question 3

What is the purpose of the low leakage divider barrier?

Answer 3

Low leakage divider separates upper from lower compartment to ensure that steam released in the lower compartment during MSLB or LOCA will pass through the ice condenser before reaching the upper compartment.

Question 4

What is the purpose of the refuel canal drains?

Answer 4

Refueling canal drains sized to allow spray water to drain back to the recirc. sump if containment spray is actuated and minimize the amount of steam bypassing the ice condenser in an accident.

Question 5

What two alarms might you have when placing the Weld channel pressurization system in service?

Answer 5

1. Low pressure
2. High flow.

Question 6

What is the purpouse of the mechanical interlock for the containment personnel air lock doors?

Answer 6

Mechanically interlocked to not allow an airlock door to be opened unless the opposite door is closed and sealed (prevent containment integrity violation).