N19 - Condensate

Question 1

What’s the purpose of the condensate system?

Answer 1

De-aerates, heats, and pumps condensate from hotwell to feedwater system

Question 2

What’s the purpose of the Condensate Booster pumps?

Answer 2

Raise condensate pressure and discharge to the Low pressure feedwater heaters

Question 3

What’s the power supplies to the CBPs?

Answer 3

A,B - 13AD

C - 14AE

Question 4

Describe the path of condensate through the condensate?

Answer 4

From LP to IP to HP, then back to the IP condenser hotwell for condensate pump suction.

Question 5

What’s the purpose of the false bottom of the condenser?

Answer 5

Allow time for N^16 gamma to decay to keep dose rates low in turbine and to keep condensate heated for efficiency

Question 6

What are the power supplies to the Condensate pumps?

Answer 6

A - 13AD

B,C - 14AE

Question 7

What level is the hotwell maintained at?

Answer 7

50%

Question 8

When will the make-up/reject valves open?

Answer 8

> 50% F520 and F521 reject open

< 50% F518 and F519 make-up open

Question 9

Where are the condensate pump suction and discharge valves operated from?

Answer 9

Suction - P177

Discharge - P680 (opens 2 seconds after pump start)

Question 10

How does the condensate min/flow valve operate? (flow path)

Answer 10

Flows from downstream of condensate clean-up to LP condenser

Question 11

What is the max flow for the condensate min/flow valve F504?

Answer 11

5 mlbm/hr

Question 12

Where are the condensate booster pump suction and discharge valves operated?

Answer 12

Suction - P176

Discharge - P680 (auto opens on pump start)

Question 13

How does the min flow valve for condensate booster pumps operate?

Answer 13

Recircs from condensate discharge header to high pressure condenser. Allows for 1.4 mlbm/hr

Question 14

What’s the purpose of the vacuum breakers?

Answer 14

Break vacuum in condenser when plant is shut down

Question 15

How do the vacuum breakers eliminate the possibility of air leakage into condenser?

Answer 15

A column of water is used as a seal above the valve

Question 16

What order do the condensate and condensate booster pumps trip in?

Answer 16

Alphabetical order

Question 17

What are the condensate pump trips?

Answer 17

• Small Dogs Hate People *

Suction valve not full open

Discharge valve full closed (15 sec TD)

Hotwell level low < 1’4” (2 out of 3 logic)

Pressure (suction low) 27.7” Hg (15 sec TD)

Question 18

What are the Condensate Booster pump trips?

Answer 18

• Little Small Dogs Like People *

Low oil pressure < 3 psig for 15 sec (closes suction valve)

Suction valve not full open

Discharge valve full closed (15 sec TD)

Loss of all condensate pumps

Pressure suction low < 46 psig (15 sec TD for A, 40 sec TD for B and C)

Question 19

What’s the trip logic for the condensate booster pumps?

Answer 19

Normal LO LO-LO LO-LO-LO
alarm & trips @ trips @ 60 sec
light 15 min
1.4 mlbm/hr 1.3 1.2-2.1 < 1.0

Question 20

What’s the trip logic for the condensate pumps?

Answer 20

Normal LO LO-LO LO-LO-LO
alarm & trips @ 15 min Trips @ 90 min
light

2.5-2.2 2.2-1.3 1.2-2.1 < 1.0