Condensate

Question 1

What is the minimum CW temperature for the Main Condensers and why

Answer 1

65*F

fatigue stress on tubes

Question 2

What is the normal storage volume of the condenser hotwells

Answer 2

100,000 gallons

4 minutes of full flow

Question 3

When do the condenser equalizing ducts blow

Answer 3

30*F differential temperature between shells

Question 4

When do the condenser equalizing ducts blow

Answer 4

30*F differential temperature between shells

Question 5

When can you open the condenser vacuum breakers be opened

Answer 5

Main turbine <1200 rpm

Question 6

What is the power supply for Hotwell makeup vlvs

Answer 6

NKN-D41

Question 7

What is the normal Condenser Hotwell levels and why

Answer 7

• > 41” - HDP trip lowers hotwell level 9”
• <45” Draw off opens
• 30” condensate pump trip

Question 8

How does the Hotwell makeup vlv fail

Answer 8

Loss of Power - Closed
Loss of Air - Closed
Lo-Lo CST lelvel - Closed

Question 9

What will Cause hotwell draw off vlv to Auto Close

Answer 9

• Low MFP suction press
• High hotwell conductivity
• Can be Overridden

Question 10

What are the power supplies to the Condensate pumps

Answer 10

A - NBN-S01
B - NBN-S01
C - NBN-S02

Question 11

What worthless feature does the Condensate pump discharge vlvs have

Answer 11

Push to stop button to stop vlv travel mid cycle

Question 12

Which hotwells do the Condensate pumps suck off

Answer 12

A - 2A/B/C
B - Either
C - 1A/B/C

Question 13

What are the Condensate pump trips

Answer 13

• Low Flow - <3600 gpm for >45 seconds
• Lo Hotwell lvl - <30” on both LT’s can override on A/C pumps for hotwell pump down
• B only, suct vlv must be full open

Question 14

What are the power supplies to the Condensate pump mini-flows

Answer 14

A - NNN-D12
B - NNN-D11
C - NNN-D12

Question 15

How do the Condensate mini-Flows fail what problem could that cause

Answer 15

• OPEN loss of air or power

- Could result in Low MFP suct. press.

Question 16

What signals are provided by CDN-V191 Condensate Demin Inlet isolation

Answer 16

• Open Permissive for 199 Demin outlet

- Modulate Permissive for 195 Demin bypass

Question 17

How large of a CW leak can Condensate Demins control/ handle

Answer 17

< 1 gpm

Question 18

When does the Condensate Demin Bypass vlv open

Answer 18

• Inlet and Outlet vlvs open

- D/P >55 psi

Question 19

How does the Demin Bypass vlv CDN-V195 fail/ Auto actuate

Answer 19

• Fails OPEN loss of air or power

Auto Opens

• Demin Inlet or Outlet NOT full open
• High D/P 55 psid
• Low Air press. 90 psig

Question 20

When can long path recirc isolation vlv SGN-HV-46 be opened and how is that accomplished and why

Answer 20

• <200*F
• Manual bypass vlv around isolation
• Prevents Thermal shock/ water hammer