Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

1. Systems > AFW > Flashcards

AFW Flashcards

1
Q

What are the MDAFP Auto Starts?

A
  • Both MFP Trips (in Auto) **
  • AMSAC (C-20)
  • Load Shed
  • Low-Low SG Lvl (2/3) on 1 SG (< 5% U1) (< 22% U2)
  • SI
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What are the TDAFP Auto Starts?

A
  • Undervolt on the RCP Bus (2/4 RCP busses at 88v)
  • SG low low lvl (2/3) on 2 SGs
  • AMSAC (C-20)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What are the MDAFP Trips?

A
  • Load Shed

- Overload/Overcurrent

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What are the TDAFP Trips?

A
  • Electronic Overspeed (108% at 4698 rpm)

- Mechanical Overspeed (111% 4829 rpm)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the purpose of the AFW system?

A
  • Maintain a minimum area of heat transfer in the SGs in order to prevent loss of PW through the Pzr Safety or Relief Valves
  • TDAFPs maintain tube sheet coverage of 10 feet
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What are the suction sources of the AFW pumps?

A
  • Own CST
  • Other Unit CST
  • Condensate Hotwells
  • ESW
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What does the AFW flow conservation signal do?

A
  • Conserves inventory and max flow to the SGs.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What happens on a AFW Flow Conservation signal?

A
  • SG Blowdown Isolations Close
  • AFW Pump Test Valves Close
  • MDAFP FMOs OPEN (regardless of position)
  • seals in for 45 seconds to ensure the FMOs OPEN
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What causes a AFW Flow Conservation Signal?

A
  • Anything that starts MDAFW pump auto start
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What does the AFW flow retention signal do?

A
  • protect against run-out after steam/feed break ***
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What happens on a AFW flow retention?

A
  • Pump discharge valves throttles back
    MDAFP - 575 gpm
    TDAFP - 955(975) gpm
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Which AFW signal overrides the other? (Retention or Conservation)

A
  • Flow Retention overrides Flow Conservation
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

How will the Unit 1 TDAFP FMOs to SG respond on an auto start signal of a TDAFP?

A
  • U1 TDAFP FMOs will not move from their throttled position
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

How will the Unit 2 TDAFP FMOs to SG respond on an auto start signal of a TDAFP?

A
  • U2 TDAFP FMOs will full open if they are closed
    HOWEVER
  • They will not reposition if they are already throttled on when an auto start signal is received*
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the trip and throttle valve powered by?

A
  • N-Train
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Where does the back up water supply to the suction of the MDAFPs come from?

A
  • East ESW Header
17
Q

Where does the back up water supply to the suction of the TDADPs come from?

A
  • West ESW Header
18
Q

What will cause an AMSAC Signal?

A
  • FW Flow < 25% (3/4 feed flows)
19
Q

Opening 1-FW-129 feeds what header from which pump?

A
  • Feeds U1 2/3 SGs (East) from the U2 W MDADP
20
Q

WHat is the T.S. Minimum for the CST and what does it provide?

A
  • 182,000 Gal
  • Maintain the plant in Mode 3 for 9 hours with steam discharge to the atmosphere via PORVS with LOOP.
  • OR-
  • Capability of holding the Unit in MODE 3 for 2 hours followed by a 4 hour cooldown to RHR
21
Q

Which SG(s) provide steam the TDAFPs?

A
  • 2 and 3 SGs
22
Q

Are the AFW flow retention switches powered from N train?

A
  • NO
  • ELSC buss (Train B)
  • AFW buss (Train A)
23
Q

What does T.S. 3.7.5D (AFW System) state?

A
  • If 3 AFW trains inoperable in Modes 1-3 (Mode 4 when relied upon for heat removal)
    IMMEDIATELY
  • Initiate action to restore 1 AFW train to Operable status LCO 3.0.3 and other mode changes are suspended until 1 AFW train is restore to Operable status
24
Q

What does T.S. 3.8.4D (AFW System) state?

A
  • If Train N DC electrical power system inoperable in Modes 1-4
    IMMEDIATELY
  • Declare the TDAFW pump inoperable
25
Q

What are the N-Train loads?

A
  • Trip and Throttle Valve
  • Test Valve
  • TDAFP to SG Supply valves
  • Auto Start circuit
  • Turbine Trip circuit
  • Electr. Overspeed circuit
  • ELO valve control power and solenoid
  • AMSAC inverter
  • N-Train Chargers are tripped by SSPS testing
26
Q

How can you tell which way the TDAFP has tripped?

A
  1. Electronic Overspeed
    - Overspeed will bring in both alarms. (Drop 10 and 50) Drop 50 will clear when seal in alarm is reset
  2. Mechanical Overspeed
    - Overspeed will bring in both alarms. (Drop 10 and 50) But Drop 50 will not clear even if the seal in alarm is reset
27
Q

How many AFW Trains are required Modes 1-3 ?

A
  • 3 Trains
28
Q

Is AFW required in Mode 4?

A
  • Only when being used to supply SGs for heat removal
29
Q

What do you do if you have all three AFW Trains Inop?

A
  • Do NOT enter TS 3.0.3, restore 1 Train Immediately **
30
Q

When is N-Train Required?

A
  • Modes 1-3
31
Q

What is also declared inoperable if N-Train is declared inoperable?

A
  • TDAFP has to be declared inop
32
Q

What valves isolate on a TDAFP start signal

A
  • SG blowdown

- AFW Pump Test Valves

33
Q

How is flow retention reset

A

Take both FMOs pull to stop

34
Q

Does flow retention protect a cross tied AFW PP

A

No

35
Q

What does AMSAC do

A

Trips the main turbine and starts all AFW pumps when C-20 is met

36
Q

Describe C-20

A

Turbine 1st stage > 40% (2/2)

37
Q

What is the time delay associated with AMSAC actuation

A

27 seconds to 220 seconds from 40%-100% power

38
Q

How is ESW aligned to the AFW PP suctions

A

Locally by closing tell-tale drains AND opening associated manual valve

1. Systems (56 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions