Feed Water

Question 1

Purpose of the Feedwater system?

Answer 1

• Raise system pressure and supply water to the S/Gs
• Maintains proper water level in S/Gs
• S/Gs provide heat transfer from the core (RCS) to turbine and auxiliary equipment

Question 2

Feed water pumps draw suction from?

Answer 2

• 70% from Condensate system

- 30% from Heater Drain Pumps

Question 3

FWS safety related functions?

Feed Water System

Answer 3

• Has no safety functions

- AFWS is aligned for safeguard operation.

Question 4

Main Feedwater Pumps

Power supplies?

Answer 4

• A 4kV Bus 1

- B 4kV bus 4

Question 5

Manual Start of 1st FW pump must have?

Answer 5

• At least 1 condensate pump running
• Sufficient suction pressure (235psig)
• Oil Pressure at least 8psig
• All FW header block valves must be closed (V2-6 A/B/C) with power supplied to them
• No FW isolation signals
• S/G level are less than 75%

Question 6

Manual Start of 2nd FW pump must have?

Answer 6

• Both condensate pumps running
• Sufficient suction pressure (235psig)
• Oil pressure of 8psig

Question 7

FW pump trips that dont autostart other FW pump

Answer 7

• Undervoltage on bus
• Loss of Condensate pump
• Low suction pressure with low flow (235psig, 3100gpm)
• Si Signal
• HiHi S/G level (2/3 in 1/3 S/G lvl >75%)

Question 8

FW Pump trips that will autostart other FW pump

Answer 8

• Electrical overload on motor
• Minimum flow (935psig)
• Low Lube oil pressure (6psig)

Question 9

FW Pump Recirc Valves
FCV-1444 and FCV-1445
Purpose?

Answer 9

• Ensure minimum flow necessary for cooling of the MFP during low flow conditions.
• AOV
• When in Auto, open when flow lowers to 1475gpm, closes at 3100gpm.(only open when associated pump is running)

Question 10

6A/6B Feedwater Heaters

purpose?

Answer 10

-Raise FW temperature using HP Turbine extraction steam.

Question 11

V2-6 A/B/C
Feedwater Header Block Valves
Power supplies?
Purpose?

Answer 11

• Used to Isolate the FW pump discharge from the Main Feedwater Reg. Valve
• A MCC-5
• B&C MCC-6
• All 3 must be closed to start first MFW pump.
• NW of MFW pumps 1st floor

Question 12

FCV-478, 488, 498

Feed Regulating Valves

Answer 12

• Regulate FW flow to the S/Gs to maintain programmed S/G level.
• AOV
• First Floor Turbine Building NW of MFW pumps

Question 13

FCV-479, 489, 499

Feed Reg. Bypass valves

Answer 13

• Regulate FW flow to the S/Gs during low load conditions for finer feed flow control. (<15% power)
• AOV
• 2nd level Turbine building NW FRV bypass room

Question 14

Feed Flow Venturi purpose?

Answer 14

• FW flow indication

- Input to the RPS and S/G level control.

Question 15

FWUFM purpose?

Answer 15

-Highly accurate FW flow measurement system.

Question 16

Hi-Hi S/G level (2/3 on any S/G @ 75%) Isolates feedwater how?

Answer 16

• Shuts its respective FRV and Bypass Valve.
• Trips both FW Pumps
• Trips the turbine

Question 17

Si signal will isolate Feedwater how?

Answer 17

• Complete isolation
• Shuts all 3 FRVs and Bypass Valves
• Trips both FW pumps
• Trips the Turbine
• Shuts all 3 FRV block Valves