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Advanced Systems > Aux Feedwater > Flashcards

Aux Feedwater Flashcards

1
Q

LCO 3.3.3 “Engineered Safety Features (ESF) Instrumentation” requirement

A

4 ESF bistables and associated instrument channels for AFAS signal, A S/G low level, and B S/G low level shall be operable

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2
Q

LCO 3.3.3 “Engineered Safety Features (ESF) Instrumentation” applicability

A

Modes 1-3

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3
Q

LCO 3.3.4 “Engineered Safety Features (ESF) Logic and Manual initiation” requirement

A

2 ESF manual initiation and 2 ESF Actuation logic channels and associated bypass removal channels shall be operable for each AFAS channel

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4
Q

LCO 3.3.4 “Engineered Safety Features (ESF) Logic and Manual initiation” applicability

A

Modes 1-3

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5
Q

LCO 3.3.7 “Post Accident Monitoring (PAM) Instrumentation” requirement

A

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

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6
Q

LCO 3.3.7 “Post Accident Monitoring (PAM) Instrumentation” applicability

A

Modes 1-3

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7
Q

LCO 3.3.8 “Alternate Shutdown System” requirement

A

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

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8
Q

LCO 3.3.8 “Alternate Shutdown System” applicability

A

Modes 1-3

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9
Q

LCO 3.7.5 “Auxiliary Feedwater (AFW) System” requirement

A

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
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10
Q

LCO 3.7.5 “Auxiliary Feedwater (AFW) System” applicability

A

Modes 1-3

Mode 4 when S/G is relied upon for heat removal

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11
Q

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

A

IMMEDIATELY

Initiate action to restore 1 AFW train to operable

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12
Q

What is the minimum required combined inventory in T-2 and T-81, including individual tank percent levels?

A
  • required combined inventory of 100,000 gallons for decay heat removal for 8 hours
  • T-2 - 71%
  • T-81 - 83%
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13
Q

What is the normal water supply to the AFW pumps?

A

T-2

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14
Q

What is the alternate water supply to the AFW pumps?

A

P-8A/B - Fire Water

P-8C - Service Water

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15
Q

What are the AFW pumps power supplies?

A

P-8A - Bus 1C

P-8C - Bus 1D

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16
Q

What are the LSPT setpoints for the AFW pumps?

A

P-8A/B - 6.7 psig (2/3 logic)

P-8C -8 psig (2/3 logic)

17
Q

What is the design flow capacity of the AFW pumps?

A

P-8A/B - 415 gpm

P-8C - 330 gpm

18
Q

What is the precaution associated with operating P-8C with only flow through its miniflow?

A
  • 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
19
Q

What is the order of pump starts on AFAS?

A

P-8A
P-8C
P-8B

20
Q

Where does P-8B steam supply come from?

A

S/G A

Supply from S/G B broke underground, so it is isolated

21
Q

How is P-8B operated from C-150/C-150A?

A

2 switches to transfer control from the Control Room to C-150/150A, and P-8B steam supply CV-0522B control

22
Q

What protective function is lost when operating P-8B from C-150/150A?

A

No LSPT, but there is a warning light to warn you that you only have 20 minutes of water supply left in T-2

23
Q

How are the P-A/B AFW pumps flow control valves operated?

A
  • 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.
24
Q

How are the P-8C AFW pump flow control valves operated?

A
  • 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%
25
Q

What initiates AFAS?

A

S/G low level of 30% (2/4 logic)

26
Q

What are the AFAS Sensor channels power supplies?

A

Y-10, 20, 30, 40

27
Q

What are the AFAS Actuation channels power supplies?

A

D11-1 and D21-2

28
Q

What happens on a loss of power to an AFAS sensor channel?

A

Loss of power causes sensor to trip (thinks there is a low S/G level)

29
Q

What happens on a loss of power to an AFAS actuation channel?

A

Prevents AFAS from actuating on the channel that power was lost to

30
Q

What is the start sequence of the AFW Pumps when AFAS is initiated?

A
  • P-8A starts after 2.5 seconds
  • P-8C starts after 30.5 seconds, if P-8A isn’t delivering 100 gpm to S/Gs, or is in manual
  • P-8B starts after 112.5 seconds from the time P-8A failed to start or deliver flow, if P-8C isn’t delivering 100 gpm to S/Gs, or is in manual
31
Q

What is required for A/B AFW pump flow controllers to be operable?

A
  • Controller in CASCADE

- Controller in AUTO with no MFW, and S/G levels & PCS temperature within band

32
Q

What are the modes of operation for the A/B AFW pump flow controllers?

A
  • MANUAL - control valve position with slide bar (AFAS won’t work)
  • AUTO - maintains flow at set point
  • CASCADE - maintains flow at 165 gpm
33
Q

What is required for C AFW pump flow controller to be operable?

A
  • In CASCADE
  • In AUTO
  • In PF MODE
34
Q

What are the modes of operation of the C AFW pump flow controller?

A
  • MANUAL - control valve position with slide bar (AFAS won’t work)
  • AUTO - maintains flow at set point. If AFAS occurs, controller will swap to CASCADE automatically
  • CASCADE - maintains flow at 165 gpm
  • PF MODE - controls 1.5” bypass valves, and controller swaps to AUTO control automatically
35
Q

What is the ORM required action if 2 channels of AFW flow indication are lost?

A

Declare the associated AFW feed flow CV inoperable

36
Q

What is a precaution associated with T-2 low level?

A

At 7.5% in T-2, place all AFW pump handswitches in Manual

37
Q

What are the AFW pump limitations based on S/G pressure?

A
  • P-8A/B can deliver required minimum flow with S/G pressure up to 1000 psia
  • P-8C can deliver required minimum flow with S/G pressure up to 900 psia
38
Q

When can AFAS be reset?

A

When both S/G levels are > 30%

Advanced Systems (36 decks)

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