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RO31 ILT > 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
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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

Where is the swith for CRV-51 (CST X-Tie) located?

A
  • U1 CR
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7
Q

How does CRV-51 fail on loss of ctrl air?

A
  • Closed
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8
Q

Can CRV-51 (CST X-tie) be manually operated?

A

Yes, operated locally by unlocking clutch pushing in t-handle and rotating handhwheel

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9
Q

What are the suction sources of the AFW pumps?

A
  • Own CST
  • Other Unit CST
  • ESW
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10
Q

What does the AFW flow conservation signal do?

A
  • Conserves inventory and max flow to the SGs.
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11
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
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12
Q

What causes a AFW Flow Conservation Signal?

A
  • Anything that starts MDAFW pump auto start
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13
Q

What does the AFW flow retention signal do?

A
  • protect against run-out after steam/feed break ***
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14
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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15
Q

What causes a AFW Flow Retention Signal?

A
  • Upon sensing a high AFW pump discharge flow
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16
Q

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

A
  • Flow Retention overrides Flow Conservation
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17
Q

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

A
  • Flow Retention overrides Flow Conservation
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18
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
19
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*
20
Q

What powers MCM-221/231 (Steam to TDAFP valve)?

A
  • 600v AC vital bus
  • MCM-221 - 11/21A via AM-A
  • MCM-231 - 11/21D via AM-D
21
Q

What is the trip and throttle valve powered by?

A
  • N-Train
22
Q

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

A
  • TDAFP discharge
23
Q

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

A
  • It will stay open
24
Q

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

A
  • Open
25
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
26
Q

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

A
  • East ESW Header
27
Q

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

A
  • West ESW Header
28
Q

What will cause an AMSAC Signal?

A
  • FW Flow < 25% (3/4 feed flows)
29
Q

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

A
  • Feeds U1 2/3 SGs (East) from the U2 W MDADP
30
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
31
Q

If the Flow Retention is reset within 45 seconds of AFW Flow Conservation or TDAFP Start signal, what will happen to the AFW FMOs?

A
  • They will re-open
32
Q

Which SG(s) provide steam the TDAFPs?

A
  • 2 and 3 SGs
33
Q

What are the AFW flow retention switches powered from?

A
  • ELSC buss (Train B)

- AFW buss (Train A)

34
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
35
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
36
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
37
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
38
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
39
Q

How many AFW Trains are required Modes 1-3 ?

A
  • 3 Trains
40
Q

Is AFW required in Mode 4?

A
  • Only when being used to supply SGs for heat removal
41
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 **
42
Q

When is N-Train Required?

A
  • Modes 1-3
43
Q

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

A
  • TDAFP has to be declared inop
44
Q

What is the mission time for AFW?

A
  • Capability of holding the Unit in MODE 3 for 2 hours followed by a 4 hour cooldown to RHR

RO31 ILT (56 decks)

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