Condensate Transfer (CT)

Question 1

What is the purpose of the CT system?

Answer 1

• Provides an initial fill for the condensate and feedwater system
• Serves as a reservoir to supply or receive condensate as required by the Main condenser hotwell control system
• Provides a source of makeup water to the steam generators and various safety related surge tanks

Question 2

The CT system provides provisions for what safety related functions?

Answer 2

• Providing Aux Feedwater pumps for S/G makeup
• During LOP, provides emergency makeup to EW surge tanks, EC Expansion Tanks, and DG Cooling Water Surge tanks
• Makeup to the spent fuel pool

Question 3

What is the normal source of makeup water to the CST?

Answer 3

DW

Question 4

Why do we establish a nitrogen blanket on the CST?

Answer 4

To prevent the absorption of oxygen by the condensate

Question 5

What powers the Condensate Transfer pump motors?

Answer 5

PH (A for ‘A’ pump, B for ‘B’ pump)

Question 6

What assures that CT safety related equipment is not degraded by freezing?

Answer 6

Freeze Protection System (QJ)/Heat Tracing

Question 7

How much of the CST is specifically designated to supply the AF system?

Answer 7

330,000 gallons

Question 8

Why is there a connection to the Fuel Pool Cooling and Cleanup system (PC)?

Answer 8

PC system receives water from the CST as an alternate source of makeup

Question 9

What is the purpose of the CST?

Answer 9

To store water for polishing demins and makeup water to the condenser

Provides a water source for Aux Feedwater and a backup source for safety systems such as DG cooling, EW, EC, and Spent fuel pool

Question 10

What is the nominal capacity of the CST?

Answer 10

550,000 gallons

Question 11

Why is there additional volume above the maximum normal operating level in the CST?

Answer 11

To accommodate insurges due to secondary system thermal expansion

Question 12

What is the backup makeup water source for the CST?

Answer 12

Liquid Radwaste

Question 13

What nitrogen pressure is maintained in the CST?

Answer 13

3.5 in H2O (0.13 psig)

Question 14

What is the purpose of the CST’s two relief valves (Breather valves)?

Answer 14

Overpressure protection and vacuum breaker

Question 15

What is the capacity of the CT pumps?

Answer 15

130 gpm each

Question 16

When would the CT pumps auto start?

Answer 16

Upon a receipt of a number of PPS ESFAS signals:

LOP, SIAS, CREFAS, CRVIAS

Question 17

What is the purpose of the CT pump mini-flow recirculation and where does that line return water to in the CST?

Answer 17

To prevent pump overheating when operating at shutoff head

Above the 330, 000 gallon level

Question 18

Where are the non-essential AFP suction valves, CTA-HV-1 and -4, located?

Answer 18

CST pump house room

Question 19

How far open do these valves need to be open for the ‘N’ AFP to start?

Answer 19

80%

Question 20

Where are they operated from and where do they receive power from?

Answer 20

Control Room

PHA

Question 21

What is the purpose of the CST loop seal?

Answer 21

To protect the CST against nitrogen loss, but also prevents excessive tank pressure or vacuum in the event of a failure of the tank breather valves (Relief valves)

Question 22

What are the temperature limits for the CST?

Answer 22

Temperature must be between 40 – 120 deg F

Question 23

What is the normal CST level?

Answer 23

• Tech spec low is 29.5’ (300000 gal)

- Automatically maintained around 41’

Question 24

Where does the CST pump skid drain to?

Answer 24

North Condenser Sump