Aux Feedwater Flashcards
LCO 3.3.3 “Engineered Safety Features (ESF) Instrumentation” requirement
4 ESF bistables and associated instrument channels for AFAS signal, A S/G low level, and B S/G low level shall be operable
LCO 3.3.3 “Engineered Safety Features (ESF) Instrumentation” applicability
Modes 1-3
LCO 3.3.4 “Engineered Safety Features (ESF) Logic and Manual initiation” requirement
2 ESF manual initiation and 2 ESF Actuation logic channels and associated bypass removal channels shall be operable for each AFAS channel
LCO 3.3.4 “Engineered Safety Features (ESF) Logic and Manual initiation” applicability
Modes 1-3
LCO 3.3.7 “Post Accident Monitoring (PAM) Instrumentation” requirement
The PAM instrumentation for each Condensate Storage Tank level, A S/G wide range level, and B S/G wide range level shall be operable
LCO 3.3.7 “Post Accident Monitoring (PAM) Instrumentation” applicability
Modes 1-3
LCO 3.3.8 “Alternate Shutdown System” requirement
The Alternate Shutdown System Functions Aux Feed Flow Indication to S/G A, Aux Feed Flow Indication to S/G B, AFW LSP alarm (P-8B), P-8B steam supply valve control, AFW flow control to S/G A, and AFW flow control to S/G B shall be operable
LCO 3.3.8 “Alternate Shutdown System” applicability
Modes 1-3
LCO 3.7.5 “Auxiliary Feedwater (AFW) System” requirement
2 AFW trains shall be operable
- Only 1 train, which requires a motor driven AFW pump is required in Mode 4
- P-8B is only required prior to making the reactor critical
- 2 AFW pumps may be placed in manual for testing for a period of up to 4 hours
LCO 3.7.5 “Auxiliary Feedwater (AFW) System” applicability
Modes 1-3
Mode 4 when S/G is relied upon for heat removal
LCO 3.7.5 “Auxiliary Feedwater (AFW) System” required actions if less than 100% of the required AFW flow is available to both S/Gs
IMMEDIATELY
Initiate action to restore 1 AFW train to operable
What is the minimum required combined inventory in T-2 and T-81, including individual tank percent levels?
- required combined inventory of 100,000 gallons for decay heat removal for 8 hours
- T-2 - 71%
- T-81 - 83%
What is the normal water supply to the AFW pumps?
T-2
What is the alternate water supply to the AFW pumps?
P-8A/B - Fire Water
P-8C - Service Water
What are the AFW pumps power supplies?
P-8A - Bus 1C
P-8C - Bus 1D
What are the LSPT setpoints for the AFW pumps?
P-8A/B - 6.7 psig (2/3 logic)
P-8C -8 psig (2/3 logic)
What is the design flow capacity of the AFW pumps?
P-8A/B - 415 gpm
P-8C - 330 gpm
What is the precaution associated with operating P-8C with only flow through its miniflow?
- Pump total flow should be > 75 gpm
- Miniflow is only 30 gpm
- Pump should only be operated like this for < 2 minutes, and shall be < 5 minutes
What is the order of pump starts on AFAS?
P-8A
P-8C
P-8B
Where does P-8B steam supply come from?
S/G A
Supply from S/G B broke underground, so it is isolated
How is P-8B operated from C-150/C-150A?
2 switches to transfer control from the Control Room to C-150/150A, and P-8B steam supply CV-0522B control
What protective function is lost when operating P-8B from C-150/150A?
No LSPT, but there is a warning light to warn you that you only have 20 minutes of water supply left in T-2
How are the P-A/B AFW pumps flow control valves operated?
- air to close with nitrogen backup
- can be operated from the Control Room (normal), C-33, C-150, and locally in CCW room
- Control Room controller passes signal to C-33 controller. If C-33 controller is in auto, signal is passed on to the valves.
How are the P-8C AFW pump flow control valves operated?
- System contains two 4” normal CVs, and two 1.5” bypass CVs.
- 4” valves are air to close with nitrogen backup, can be operated from the Control Room (normal), C-150, and locally in WESG. Control Room controller passes signal to C-33 controller. If C-33 controller is in auto, signal is passed on to the valves.
- 1.5” bypass valves are the same as the 4” valves except they are air to open, and there is no control for them at C-150. To use the bypasses, need to ensure S/G pressure > 212 psia, or S/G level > 60%
