Exam 8 Review questions

Question 1

At what suction pressure do the AF pumps trip?

Answer 1

16.5 psia

Question 2

At what suction pressure do the AF pumps swap from CST to SX?

Answer 2

18.1 psia

Question 3

What is the relationship between AF005s and AC/DC/IA?

Answer 3

On a loss of DC they fail open. On a loss of IA they fail open. On a loss of AC 111 or 114 they fail closed because demand signal goes to 0%

Question 4

What is the effect of losing the SX system while both AF pumps are running?

Answer 4

The ‘A’ pump will trip but the ‘B’ will keep running because it has an SX booster pump

Question 5

What are the loads on bus 157?

Answer 5

1A and 1C HDP, 1A RCP

Question 6

What is the 6.9 kv bus undervoltage scheme?

Answer 6

At <5268 V on 2/4 busses; AF pumps start and reactor trip if above P-7. At <4920V all load breakers will get stripped

Question 7

What is the setpoint of the 6.9 kv bus underfrequency scheme?

Answer 7

<57 Hz on 2/4 busses will trip all running RCPs and generate reactor trip if above P-7.

Question 8

Where are the 6.9 kv busses underfrequency relays powered from and in what scenario would they not actuate?

Answer 8

The underfrequency relays are powered from the 6.9 kV bus itself and will actuate if frequency is degrading but will not actuate if the bus loses power instantaneously.

Question 9

What are the TDFWP trips?

Answer 9

Overspeed at 5720 rpm. Low EH pressure <1000 psig. Low vacuum <14” HgA. Manual PB or Ovation button. Local EH handle. Both HP and LP stop valves closed. P-14. SI. Low lube oil <10 psig.

Question 10

What are the CD/CB pump trips?

Answer 10

P.L.U.G. Phase OC - Low lube oil <4.3 psig - Undervoltage - Ground OC

Question 11

What are the various containment pressure setpoints?

Answer 11

3.4 psig 2/3 actuates SI. 8.2 psig 2/3 MSI. 20.0 psig 2/4 Phase B and CSAS