Condensate Storage and Transfer (CNS)

Question 1

What is the purpose of the Condensate Storage and Transfer system?

Answer 1

1. Stores and distributes condensate quality water to the plant
2. Reserves of 135,000 gal in ea. tank for RCIC (A CST) and HPCS (B CST)

Question 2

What is the power supply for Condensate Transfer Pump 1A?

Answer 2

US9 Bus A

Question 3

What is the power supply for Condensate Transfer Pump 1B?

Answer 3

US9 Bus B

Question 4

What supplies control power for condensate transfer pumps 1a/b?

Answer 4

“A” Battery

Question 5

What are the Auto Starts for the Condensate Transfer Pumps?

Answer 5

1. Low Discharge Header Pressure (<= 95psig for 5 sec)
2. High Discharge Header Flow (>= 760 gpm for 5 sec)
3. Trip of the running pump

Question 6

What is the auto trip of the condensate transfer pumps?

Answer 6

CST lo-lo level (18’7” A, 18’8” B)
Motor overload
Sustained Bus Undervoltage

Question 7

What happens to HW valves on a loss of IAS or loss of SCI PNL?

Answer 7

1. Normal MUF valve (LV103) fails open
2. Emergency MUF valve (AOV304) fails shut
3. Spill Valve (LV105) fails shut
4. M/U valve to CST (AOV123) fails shut

Question 8

Why are CST levels maintained > 135,000 gallons?

Answer 8

For CSH and RCIC during a LOCA

Question 9

What happens when condensate supply to the CRD system is cutoff?

Answer 9

Total condensate transfer system flow will rise by approximately 70-90 gpm. This will cause hotwell level to rise and control at approximately 22”

Question 10

What is normal HW level maintained at?

Answer 10

9” - 15”