Emergency Core Cooling

Question 1

Where do the High Pressure Safety Injection Pumps discharge to?

Answer 1

All 4 Cold Legs

Question 2

What is the shutoff head of the HPSI Pump?

Answer 2

1800 psia

Question 3

Where do the LPSI Pumps discharge to?

Answer 3

Their respected Cold legs

Question 4

What is the shutoff head of the LPSI pump?

Answer 4

200 psia

Question 5

What component in the Emergency Core Cooling System is considered passive?

Answer 5

Safety Injection Tanks

Question 6

At which pressure do the SITs start supplying borated water?

Answer 6

600 psia

Question 7

What kind of water is the Refueling Water Tank?

Answer 7

Borated water

Question 8

What is the purpose of the Recirculation Sumps?

Answer 8

Provide back up inventory to the HPSI and CS Pumps when RWT level is 9.4%

Question 9

What happens on a Recirculation Actuation Signal?

Answer 9

LPSI Trips
Mini Circulation Paths Close
RAS Sumps- CS pumps- SDCHx-Containment Spray Nozzles

Question 10

What is the purpose of the Trisodium Phosphate Baskets?

Answer 10

Increase pH and ensure Iodine remains in solution

Question 11

What is the purpose of the Containment Spray System?

Answer 11

Spray borated water at a High High Containment Pressure
Reduce Containment Pressure
Remove Iodine from atmosphere

Question 12

What is the purpose of the Shutdown Cooling System?

Answer 12

Cool down the reactor from 350 degrees to refueling temperature

Question 13

Which pumps are used in the Shutdown Cooling System?

Answer 13

LPSI and CS Pumps

Question 14

What cools the Shutdown Cooling Heat Exchanger?

Answer 14

Essential Cooling Water System

Question 15

What is the flow path of the Shutdown Cooling System?

Answer 15

hot leg – pumps – SDCHx – cold leg