Main feed and SGWLC

Question 1

What is the purpose of the Main Feed? How is this accomplished?

Answer 1

It is designed to transfer water from the condensate system to the steam generators.
To accomplish this it 1. Increases feedwater pressure from the condensate system pressure of about 600 psig to about 1100 psig, which is required by the steam generators
2. Heats the feedwater to meet the temperature requirements of the steam generator
3. Accepts chemical solutions from the chemical feed system enroute to the steam generators
4. In conjunction with the steam generator water level control system (SGWLC), automatically controls the steam generator water level during steady state and transient conditions.

Question 2

What are the two systems the Steam Generator Water Level Control system (SGWLC) is composed of? What do each of them do?

Answer 2

The S/G water level control portion of the system allows automatic or manual control of the S/G water level by positioning the feed regulating valves at higher power levels, or the feed reg bypass valves while at low reactor power levels

The feed pump speed control portion of the S/G water level control system varies the speed of the turbine driven main feed pumps (TDMFPs) in order to maintain the proper differential pressure (P) across the main feed regulating valves.

Question 3

DESCRIBE the function and location of the Motor & Turbine Driven Main Feed Pumps (FWS-P1, P2A/B)

Question 4

DESCRIBE the function and location of the Main Feed Pump Discharge Valves (FWS-MOV23A/B/C)

Question 5

DESCRIBE the function and location of the Motor Driven Main Feed Pump Startup & Startup Bypass Valves (FWS-HV590/590A)

Question 6

DESCRIBE the function and location of the Main Feed Pump Recirculation Valves (FWR-FV21A/B, FV20)

Question 7

DESCRIBE the function and location of the Turbine Driven Main Feed Pump Control & Stop Valves

Question 8

DESCRIBE the function and location of the Turbine Driven Main Feed Pump Turning Gear Motors

Question 9

DESCRIBE the function and location of the Motor Driven Main Feed Pump Auxiliary Oil Pump (FWL-P2)

Question 10

DESCRIBE the function and location of the Main Feed Pump Seal Water Booster Pumps (CNM-P2A/B)

Question 11

DESCRIBE the function and location of the First Point Feedwater Heaters

Question 12

DESCRIBE the function and location of the First Point Feedwater Heater Suction & Discharge Valves (FWS-MV16A/B/C & FWS-MV19A/B/C)

Question 13

DESCRIBE the function and location of the First Point Feedwater Heater String Bypass Valve (FWS-MV17)

Question 14

DESCRIBE the function and location of the Flushing (Long Recycle) Valve (FWS-HV43)

Question 15

DESCRIBE the function and location of the Main Feed Regulating Valve Inlet Isolation Valves (FWS-MV 35A, B, C, D)

Question 16

DESCRIBE the function and location of the Main Feed Containment Isolation Trip Valves (FWS*CTV41A/B/C/D) Controls and Interlocks

Question 17

DESCRIBE the function of the Steam Generator Water Level Control System

Question 18

DESCRIBE the function and location of the Main Feed Reg & Feed Reg Bypass Valves

Question 19

What is the purpose the feedwater system was designed for?

Answer 19

1. Increase feed pressure from 600 to 1100 psig
2. Preheat water for Efficiency
3. Accept Chemicals/Clean up System
4. Control SG inventory
5. Isolate Non-Safety Feed Water System from SG’s