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RO34 - Revised and Upgraded Decks > 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
  • SI
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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)
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3
Q

What are the MDAFP Trips?

A
  • Load Shed
  • Overload/Overcurrent
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4
Q

What are the TDAFP Trips?

A
  • Electronic Overspeed (108% at 4698 rpm)
  • Mechanical Overspeed (111% 4829 rpm)
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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
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6
Q

What are the suction sources of the AFW pumps?

A
  • Own CST
  • Other Unit CST
  • ESW
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7
Q

What is the purpose of the AFW flow conservation signal?

A

Conserves inventory and max flow to the SGs

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8
Q

What happens on an 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
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9
Q

What causes an AFW Flow Conservation Signal?

A

Anything that starts MDAFW pump auto start

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10
Q

What does the AFW flow retention signal do?

A

Protect against run-out after steam/feed break by limiting flow from the AFW pumps that may be supplying the faulted SG

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11
Q

What happens on a AFW flow retention?

A

Pump discharge valves throttles back
- MDAFP 575 gpm
- TDAFP 955 (975) gpm

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12
Q

What causes an AFW Flow Retention Signal?

A

High AFW pump discharge flow

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13
Q

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

A

Flow Retention overrides Flow Conservation

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14
Q

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

A
  • Flow Retention overrides Flow Conservation
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15
Q

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

A

U1 TDAFP FMOs will not move from their throttled position

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16
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, but will remain as is if throttled

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17
Q

What is the trip and throttle valve powered by?

A

N-Train

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18
Q

What is the TDAFP Turbine oil Cooler and Governor Oil Cooler cooled by?

A

TDAFP discharge

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19
Q

If you put the TDAFP ELO switch in Manual what will the valve do?

A

Stay open

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20
Q

How do the TDAFP ELO fail on loss of air and ctrl power?

A

Open

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21
Q

Why are the U1 TDAFP outlets to SG valves throttled (FMO-211, 221, 231, 241)?

A

Prevent overfill of SGs on the event of a tube rupture

22
Q

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

A

East ESW Header

23
Q

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

A

West ESW Header

24
Q

What will cause an AMSAC Signal?

A

FW Flow less than 25% (3/4 feed flows)

25
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

26
Q

Which SG(s) provide steam the TDAFPs?

A

2 and 3 SGs

27
Q

What does T.S. 3.7.5D (AFW System) state if 3 AFW trains are inoperable in Modes 1-3 (Mode 4 when relied upon for heat removal)?

A

IMMEDIATELY Initiate action to restore 1 AFW train to Operable status. Do NOT enter LCO 3.0.3 change modes

28
Q

What does T.S. 3.8.4D (AFW System) state if the N Train DC electrical power system is inoperable in Modes 1-4?

A

IMMEDIATELY Declare the TDAFW pump inoperable

29
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

Flow retention switches are NOT

30
Q

How can you tell if it’s an electronic or mechanical overspeed on the TDAFP?

A

Electronic Overspeed
- Overspeed will bring in both alarms. (Drop 10 and 50) Drop 50 will clear when seal in alarm is reset

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

31
Q

What are the Safety functions of Aux Feed?

A
  • Provides Feedwater to S/G’s when Main Feedwater Pumps are unavailable
  • Removes Core Residual Heat
32
Q

How many AFW Trains are required Modes 1-3 ?

A

3 Trains

33
Q

Is AFW required in Mode 4?

A

Only when being used to supply SGs for heat removal

34
Q

What do you do if you have all three AFW Trains Inop in mode 1?

A

Do NOT enter TS 3.0.3!! Restore 1 Train Immediately

35
Q

When is N-Train Required?

A

Modes 1-3

36
Q

What is the mission time for AFW?

A

7 days (for now)

37
Q

Does the flow retention signal protect a AFW pump if it is cross-tied from the other unit?

A

NO

38
Q

What is the Low Low SG Level for Unit 1?

A

5%

39
Q

What is the Low Low SG Level for Unit 2?

A

22%

40
Q

What does an AMSAC actuation do?

A

Trips the turbine and starts all AFW Pumps

41
Q

What is C-20?

A

Enables AMSAC
2/2 Turbin 1st stage Impulse Pressures greater than 40%

42
Q

What conditions cause AMSAC to actuate?

A

Feed flow less than 25% on 3/4
(1 channel from each SG)
(channels are 1, 2, 1, 2)

43
Q

What is the time delay for AMSAC?

A

Variable. 27 secs - 220 secs from 100% to 40% power

44
Q

What steps are taken to align ESW to AFW?

A
  1. Locally Close the Tell-Tale Drain
  2. Open associated manual isolation
  3. Open MOV from control room
45
Q

When must the TDAFP be operable?

A

Greater than 350°F (MODE 3), regardless of SG Pressure

46
Q

Describe the capabilities of the MDAFP with regards to the minimum AFW flow for RCS Decay Heat removal.

A

This flow meets the minimum required for RCS Decay Heat Removal

47
Q

Which steam generators do the East MDAFP Feed?

A

2 and 3 on own unit
1 and 4 on opposite unit

48
Q

Which steam generators do the West MDAFP Feed?

A

1 and 4 on own unit
2 and 3 on opposite unit

49
Q

Which SGs do the TDAFP feed?

A

1-4 of own unit only

50
Q

How do you resotre the N Train battery charger to service after a loadshed?

A

Send AEO to turn Battery Charger Control box switch on the I/S battery charger to Off then back to Auto

51
Q

Which MDAFP auto start is NOT available if the control switch is in neutral?

A

Loss of both MFPs

52
Q

What protects the Aux Feed Water Pumps from minimum flow conditions

A

Emergency Leak Off Valves

RO34 - Revised and Upgraded Decks (84 decks)

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