Recirc and VFD

Question 1

What is 100% core flow?

Answer 1

77 Mlbm/hr

Question 2

What is rated feedwater flow?

Answer 2

12.8Mlbm/hr

Question 3

What powers the Discharge (F031A/B) and Discharge Bypass (F032A/B) valves?

Answer 3

Same division opposite unit 480V E bus

Question 4

What causes auto closure of Discharge and Discharge bypass valves?

Answer 4

LPCI initiation AND RPV pressure <310psig

Question 5

What is the power supply for the Suction valves (F023A/B)?

Answer 5

Same unit division 480V e bus

Question 6

What auto closes the Sample valves (F019, F020)?

Answer 6

Group 1 signals LL3 (45”) or Low condenser Vacuum (10”) ONLY

Question 7

What is the air supply for each sample valve?

Answer 7

F019 - N2 F020 - Air

Question 8

What are the recirc pump start permissives?

Answer 8

Seal Staging valve in manual/open Switchgear control power available Suction Valve Open Bypass Valve Open Discharge valve open

Question 9

What will trip the RCR Input Circuit Breaker (and trip a RCR pump)?

Answer 9

Discharge valve <90% open AND Bypass valve not full open

Suction valve <90% open

ATWS ARI signal (LL2 105” or RPV pressure 1137.8psig)

UV on B bus

Overcurrent (ICB or VFD output)

Overfrequency (VFD output)

Emergency stop PB

Open Breaker PB

Question 10

What actions are required if RBCCW is lost to a recirc pump?

Answer 10

Restore or secure pump in 10 minutes

Question 11

What actions are required if RBCCW and CRD flow are lost to a recirc pump?

Answer 11

Secure pump in 90 seconds

Question 12

What are the temperature requirements to start the 1st recirc loop? (no loops running)

Answer 12

TOP to Bottom <= 145dF

AND

Loop to Vessel <= 50dF

Question 13

What are the temperature requirements to start the second recirc loop? (one already running)

Answer 13

Top to Bottom <=145dF

AND

Loop to Loop <= 50dF

AND

Operating loop <= 50% flow (23,500gpm U1/ 24500gpm U2)