Condensate and Main Feed

Question 1

LCO 3.7.3 “Main Feedwater Regulating Valves (MFRVs) and MFRV Bypass Valves” requirements

Answer 1

2 MFRVs and 2 MFRV Bypass Valves shall be operable

Question 2

LCO 3.7.3 “Main Feedwater Regulating Valves (MFRVs) and MFRV Bypass Valves” applicability

Answer 2

Modes 1-3, except when both MFRVs and both MFRV Bypass Valves are either closed and de-activated, or isolated by closed manually actuated valves

Question 3

LCO 3.7.6 “Condensate Storage and Supply” requirements

Answer 3

The combined usable volume of the Condensate Storage Tank (CST) and Primary Makeup Storage Tank (T-81) shall be >= 100,000 gallons
T-2 > 71%
T-81 > 83%

Question 4

LCO 3.7.6 “Condensate Storage and Supply” applicability

Answer 4

Modes 1-3

Mode 4 when steam generator is relied upon for heat removal

Question 5

What level is the hotwell normally maintained at?

Answer 5

66-71%

Question 6

How is hotwell level normally maintained?

Answer 6

• Normal 3” makeup valve auto opens at 66%

- 4” reject CV auto opens at 76% and rejects water to T-2

Question 7

What is the precaution based on control/indication of hotwell 4” reject valve?

Answer 7

No indication or control in the control room, so if the valve fails open, hotwell level will lower, and damage could occur to the condensate pumps

Question 8

What are the power supplies for the condensate pumps?

Answer 8

P-2A - ‘A’ Bus

P-2B - ‘B’ Bus

Question 9

What is the design flow/pressure of the condensate pumps?

Answer 9

9250 gpm @ 500 psi

Question 10

What is the power limit with only 1 condensate pump running?

Answer 10

30%

Question 11

What is the function of the condensate recirc CV?

Answer 11

• Maintains minimum flow through air ejector condenser (5200 gpm) and gland seal condenser (1600 gpm) @ 6800 gpm
• Gives condensate pumps a flow path on plant startups and shutdowns

Question 12

How does the condensate recirc CV fail on a loss of air?

Answer 12

Closed

Question 13

What causes the condensate recirc CV to auto open?

Answer 13

Plant trip or 25% power and lowering

Question 14

When is the condensate recirc CV closed?

Answer 14

Approximately 35-40% power and rising

Question 15

What are the reset permissives for the MFPs?

Answer 15

• Suction valve open
• Condenser vacuum > 15” Hg
• T&T valve closed

Question 16

What are the MFP trips?

Answer 16

• Thrust bearing
• LSPT (2/3 logic 250 psig for 3 seconds)
• Low bearing oil pressure (9 psig)
• Low governor oil pressure (25 psig)
• Overspeed (5500 rpm)

Question 17

What MFP speed is maintained by the MFP governor?

Answer 17

3250-5250 rpm

Question 18

What is the interlock between the MFP recirc CV and T&T valve?

Answer 18

• If both T&T valves are closed, MFP recirc CV is closed.
• If either T&T valve is open, MFP recirc CV will be able to modulate open based on MFP suction flow (3000 gpm = full open, 6000 gpm = full closed)

Question 19

What is the purpose of the MFP recirc CVs?

Answer 19

Provide minimum flow protection for the MFPs

Question 20

What are the power supplies for the MFP recirc CVs?

Answer 20

P-1A recirc CV - Y-10

P-1B recirc CV - Y-20

Question 21

How do the MFP recirc CVs fail on a loss of air or preferred AC?

Answer 21

Open

Question 22

Approximately what power levels are the MFP recirc CVs used?

Answer 22

Throttled open from 0-45% power