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ILT 2022 > Exam 3 > Flashcards

Exam 3 Flashcards

(36 cards)

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1
Q

SLIS

  • Signals
  • What happens on SLIS?
A

SLIS

  • 615 psig (2/3 PTs on 1/4 S/Gs)
  • 100 psid drop in 50 sec when < P-11 w/ low Pstm SI blocked (2/3 PTs on 1/4 SG/s)
  • CTMT Hi-2 (17 psig on 2/3)

Closes

  • MSIVs
  • MSIVBVs
  • Low Point Drain IVs
  • TDAFP Warmup Valves
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2
Q

SGBSIS (Steam Generator Blowdown Sample Isolation Signal

  • Causes
  • Valves Closed​
A

Causes (SUM)

  • SI
  • UV on NB01 or NB02
  • MDAFAS

Valves Closed

  • BD Isolation Valves: BM-HV-01 thru 04
  • Sample Isolation Valves:
    • BM-HV-35 thru 38 (Lower)
    • BM-HV-19 thru 22 (Upper)
  • Outer Sample CIS Valves: BM-HV-65 thru 68
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3
Q

Main Feed Pump Speed Controller

  • Operation in following modes:
    • Auto
    • Manual
    • Valve Control
    • Overspeed
A

Auto

  • Controls steam admission valves based on speed demand
  • Setpoint comes from master controller
  • Low Stop - 3650 rpm
  • High Stop - 5712 rpm

Manual

  • Controls speed setpoint input by operator
  • Controls from 0-5712 rpm (no low speed stop)

Valve Control

  • Operator contols steam admission vale position (%)
  • No speed feedback

Overspeed

  • Speed demand set using arrows.
  • Controls from 0-6225 rpm (no low speed stop)
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4
Q

Aux Steam Loads​

A
  • Steam Seal System
  • MSR Tube Blankets
  • Plant Heating
  • Various Storage Tank Heating
  • Main Condenser Sparging
  • Decontamination System
  • Aux Feed Pump Turbine (TDAFP)
  • Main Turbine Shell Warming
  • Laundry Dryers
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5
Q

Main Feed Annunciators

  • MFP suction pressure low
  • Bearing oil strainer DP
  • MFT/MFP oil pressure low
  • ACC Tank N2 pressure low
  • MFP LO Cooler Temp Hi
  • MFT Turbine Bearing Hi Oil Temp
A
  • Setpoint: 325 psig. Suction pressure must be > 240 psig for 2 MFPs, > 300 psig for 1 MFP.
  • 15 psig
  • 5.5 psig
  • TKA02-TKA05: 625 psig, TKA06: 450 psig
  • 135°F
  • 180°F
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6
Q

Heater Drain Tank & Pumps

  • Inputs to Tank
  • Pump Flow
  • Pump Cooling
  • Motor Cooling
  • Recirc Valve Operation
  • Trips
A

Inputs

  • # 5 Heaters
  • # 6 Heaters
  • MSDTs (Normal)
  • SGBD Flash Tank Vent
  • SGBD RHX Condensate Outlet
  • Reboiler Drain Tank
  • HDP Recircs
  • SUFP Recircs

Pump

  • 50% flow
  • Pump cooled by flow
  • Motor cooled by Closed Cooling Water (CLCW)
  • Recirc valve opens @ < 1250 gpm
    • Fails open on loss of air
  • ‘A’ trips on Low-Low Level (5” from bottom of sightglass)
  • ‘B’ Trips on Low Level (17” from bottom of sightglass)
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7
Q

Main Feed Water System Bypass Switches

  • S701 on SB029D/SB032D
  • FC HIS-82/182 on RP068
  • FC HS-25/26 on RL028
A
  • Bypasses P-4/564 FWIS to prevent actuation when opening RTBs during normal shutdown.
  • MFP A/B FWIS trip block: Permits emergency start of MFPs during FR-H.1 (EOP Add 30 & 31)
  • AFP ESFAS Train A/B Block - prevents inadvertant AFAS when tripping both MFPs in Mode 3 during normal shutdown.
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8
Q

CST

  • CST Volume & Basis (T/S 3.7.6 Requirements)
  • Connections to pumps/systems
  • CST temperature band & heat trace supply

HCST

  • Purpose, Size & Mission Time
  • Swap-over setpoint
  • Temperature control
A

CST

  • CST Volume & Basis (T/S 3.7.6 Requirements)
    • _​_450,000 gallons
    • Insulated & vented
    • Has floating cover & N2 purge to minimize O2 intrustion.
    • 281,000 gal T/S requirement.
      • Applicable in MODES 1-3
      • (~60%) allows 4 hours in HSBY and 4 hours to Cooldown to RHR entry conditions.
      • Includes volume to prevent ESW swap over and minimum AFP NPSH.
  • Connections to pumps/systems
    • _​_Suction to AFPs, NSAFPs, AFP Mini-Flow returns, makeup & reject, NSAFP Recirc return (via reject), Condenser Vacuum Pumps, seal water makeup, Demin makeup, N2, overflow to LSW.
  • CST temperature band & heat trace supply
    • _​_55-70°F
    • Heat trace maintained by Aux Steam
    • Makeup 85-89%

HCST

  • Purpose, Size & Mission Time
    • _​_450,000 gal, enough to supply AFPs after loss of CST & ESW for 30-36 hours.
  • Swap-over setpoint
    • _​_1/2 at 11.5 psig AFPs suction auto swaps to HCST
  • Temperature control
    • _​_Maintained > 50°F by submersible heaters
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9
Q

ASDs

  • Lift Setting
  • Flowrate & MS System Rated Flow
  • Operation Locations (Controllers & Manual)
A
  • 1125 - 1185 psig
  • 594,000 lbm/hr, ~3.7% per valve, total MS Flow 16x106 lbm/hr
  • MCB or ASP.
    • Transfer switch on ASP
    • B&C ASDs have local controllers in Area 5
    • All ASDs may be operated with handwheel.
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10
Q

BSPIS

(Blowdown Sample Process Isolation Signal)

  • Causes
  • Valves Closed
A

Causes (BSPIS Sounds like Urinae, Closed Valves 1 thru 8)

  • Blowdown Process Surge Tank Hi Level
  • Blowdown Flash Tank Hi Level

Valves

  • BD isolates BM-HV-01 thru 04
  • Outer Sample CIS Valves BM-HV-05 thru 08
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11
Q

Feed Pump Master Controller

  • Operation in Auto-High Power & Low Power
  • Operation in Manual
  • How to transfer between MFRV & MFRBVs, Timing, and how to cancel
A

Auto

  • High - Controls D/P on progam
    • D/P is difference between Median Feed Pressure (AE-PT-0508A/B/C) vs. Median Steam Pressure (AB-PT-507A/B/C).
    • Steam Flow is sum of 4 loops averaged density compensated steam flow.
  • Low - Maintains D/P at 215 psid, arrows control setpoint.
    • Used when using MFRBVs, which requires a fixed D/P

Manual

  • Up/Down arrows control MFP Speed deman to adjust D/P

How to Transfer, Timing, and Cancelling:

  • To Transfer, hit Xfer button as appropriate provided permissives are met.
    • Starts 720 second cycle timer
  • To cancel, hold manual on valve controller for 3 seconds until manual button lit & not blinking.
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12
Q

Aux Boiler

  • Power Supplies to:
    • Forced Draft Fan
    • Fuel Oil Booster Pumps
    • Aux Steam FW Pumps
  • Major & Minor Paths
  • Guns & when they are used
  • Role of instrument and service air in Aux Boiler
  • Control Systems
  • Trips
A

Power Supplies

  • Forced Draft Fan: PG11
  • Fuel Oil Booster Pumps: PG19G/20B
  • AS FW Pumps: PG11/12

Major/Minor Paths

  • Major: Fuel; Combustion Air; Feedwater; Steam
  • Minor: Blowdown; Atomizing Airstream

Guns

  • Aux Gun: Up to 22% Load
  • Main Gun: With Aux Gun above 22% Load

Role of Instrument and Service Air in Aux Boiler

  • Service Air: provides atomizing air to Aux Gun (main uses atomizing air)
  • Instrument Air: provides aspirating air to clean & seal gun not in service.

Control Systems

  • Furnace Safeguards Supervisory System: provides Trips and controls for S/U & S/D.
  • Combustion Control System: Controls inputs (fuel, air, feed, stm) & Outputs

Trips

  • Loss of Fan
  • No Pumps
  • Low Drum Level (~5.25”)
  • Lo atomizing pressure (75 psig)
  • Hi Steam Pressure (145 psig)
  • Oil Supply Pressure Low (20 psig)
  • Loss of Flame (2/2 sensed)
  • Both Trip Buttons
  • Gun not engaged
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13
Q

Instrument Air Compressors

  • Power Supplies to each, Rating
  • Cooling to each
  • How ‘C’ is different from ‘A’ & ‘B’
  • Operation of KA-PV-0011
  • Sequential Loading
  • Compressed Air Pressure Low Alarm (92A) setpoint
  • Instrument Air Dryer Pressure Low (91A) setpoint
  • Unloadded Operation
A
  • ‘A’ - NG03, ‘B’ NG04, ‘C’ - PG15; 845 scfm @ 125 psig
  • ‘A’ & ‘B’ cooled by ESW; ‘C’ cooled by Chilled Water
  • ‘C’ doesn’t have coolign water PCV, doesn’t have booster pump.
  • KA-PV-0011 closes on 110 psig which isolates Service air.
  • Compressor Loads Unloads

Lead 119 # 128 #

Lag 117 # 126 #

Standby 115 # 124 #

Positions: ABC, BCA, CAB

  • 112 psig (92A)
  • 105 psig (91A)
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14
Q

Instrument Air Dryers

  • Cycle Time
  • Dryer response to low pressure
A
  • 10 minutes
    • 5 minutes drying
    • 5 minutes recharging
  • At 105 psig on the lead dryer will cause low pressure alarm and open inlet/outlet to lag dryer & place it in service.
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15
Q

Reboiler Operation

  • When to transfer from Aux Boiler to Reboiler & vice-versa
  • Reboiler to Steam Supplies
  • Feed preheating alignment
A
  • Startup: to Reboiler between 20-30%; Shutdown: to Aux Boiler from 10-15%
  • 5th Stage Extraction & Main Steam
    • Extraction supplies 3-9 psig, if high load, MS supplies 9-15 psig.
  • Extraction & MS isolated to reboiler, MS @ 9-15 psig si sent thru FB-HV-81 to preheat #6A/B FW Heater.
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16
Q

Main Feed Pump

  • Nominal speed, exhaust & recircs, seal water supplies, max power on 1 MFP
  • LP and HP supply and how its switched.
    • How much valve position is controlled from each in “Valve Control”
  • MFP Oil System Setpoints
  • Turning gear controls/setpoins
  • Bearing oil temp limits. Min temp to roll MFP turbine
Study These Flashcards
A
  • 5,560 RPM, A to IP B to LP exhaust, Recirc A to HP B to IP, condensate pumps (Norm) demin (Backup/Startup), 65% max power on one.
  • “Low press” stem from ‘B’ MSR hot reheat line, “High press” from Main Steam cross-tie header.
    • Switches to “LP” as power increases since hot reheat pressure increases. At ~40%, all steam flow is from LP.
    • In valve control, first 20% attempts to use LP. To get to HP, must open past 20%.
  • AP control oil (220#) to stop control valves, LP control oil (55#) to wear device, 20 # LO to pump, 12# LO to bearing. Pumps powered from (A) PG13Q/12J (B) PG12J/11K. Standby starts at 175#. Emergency at 20#. Oil Cooled by CLCW.
  • Turning gear auto engages/disengages @ 2 rpm. LO @ 5 seconds. If LO Pressure < 4 psig will trip.
  • Oil outlet < 180°F and ΔT < 50°F. 60°F min temp for startup.
17
Q

Extraction Steam & Heater Drains (AF)

  • HP Heater flow rating.
    • Effect from high-high level.
  • LP Heater & Extraction Steam MOVs.
    • Which heaters have BTVs?
    • How do other heaters prevent overspeed?
  • 1st Stage Reheater DT/MSDT Interlocks?
  • 2nd Stage RDT Interlocks
  • Arrangement of MSR/Reheate Drain Tanks?
  • Max power with LP or HP Heaters Isolated?
Study These Flashcards
A
  • 50% flow
    • Extraction steam have MOVs that shut on high-high level
  • Extraction steam lines to #3/#4 Htrs have MOVs that shut on Hi-Hi Level
  • 3/4/6/7 have BTVs.
    • Close on Hi-Hi Level
    • # 5 prevented by CIVs
    • # 2 has check valv
    • # 1 has baffles in heater.
  • Dump valve opens @ 10% power to pull air & gases to Condenser.
  • Dump valve opens @ 20% power to pull air & gases to Condenser.
18
Q

Extraction Steam Stages & Where they go:

19
Q

Condenser Vacuum Pumps

  • Power Supplies
  • Connections to HVAC & What happens on SIS & Startup Alignment
  • Standby Features
  • Seal Water makeup and overflow
  • Seal Water cooling
  • Interlock
Study These Flashcards
A

Condenser Vacuum Pumps

  • Power Supplies
    • _​_A & C: PG11
    • B: PG12
  • Connections to HVAC & What happens on SIS & Startup Alignment
    • _​_Discharges to TB HVAC, which exhausts thru filter absorber unit on 2047’ AB. GE-RE-92 monitors exhaust for SBTR.
    • On SIS dampers close -> hoggers trip. Dumpers & hoggers may be restarted on w/o resetting SI.
    • On Startup, valved to exhuast to TB Atmosphere = unmonitored release & samples must be taken.
  • Standby Features
    • ​Standby auto starts @ 5.6” HgA (23.5” HgV)
  • Seal Water makeup and overflow
    • _​_Makeup: CST
    • Overflow: Misc. Condensate Drain Tank
  • Seal Water cooling
    • Service Water
  • Interlock
    • _​_Prevents opening suction valve unless D/P < 1.5” HgA (ensures that you don’t break vacuum).
    • Additionally interlocked pump w/ filter absorber discussed above.
20
Q

CSDs (Condenser Steam Dumps)

  • Capacity
  • Where the dumps go/groups
  • How to Cool Down < 550°F
  • Controls
  • Purpose of AC-PT-505, 506, & 507
Study These Flashcards
A
  • 528,000 lbm/hr (3.3% Steam Flow), 12 total CSDs
  • 3 CSDs per Group, 4 Groups (7 CSDs to LP; 4 CSDs to IP; 1 CSD to HP)
    • Group 1 & 2:
      • 3 to LP
    • Group 3:
      • 1 to LP
      • 2 to IP
    • Group 4:
      • 2 to IP
      • 1 to HP
  • Pstm mode, Once Temp < P-12 (550°F), blocks CSDs, Place Stm dump bypass interlock AB-HIS-63/64 in BYP/Interlock.
  • Stm Dump selector (AB-US-5002) selects:
    • Tavg (Load Reject OR Plant Trip)
    • Pstm
  • ​PT-505: Make Tref for CS Control
  • PT-506: Feeds C-7 (10% stop or 5%/min for 2 min)
    • Reset -> Resets C-7 (PT-506)
  • PT-507: Feeds steam pressure controller (AB-PK-507)
    • 10 Turn Pot from 0-1500 psig (150psig/turn)
      • 1092 psig = 7.28 turns
21
Q

LP FW Heaters

  • Flow rating, efficiency rise
  • Extraction Point for each heater
  • Max power with 1, 2, or 3 htr strings out of service
  • Nominal ΔT across each heater
  • Isolation Valve operation & interlocks
  • Location of the heaters and arrangment
Study These Flashcards
A

LP FW Heaters

  • Flow rating, efficiency rise
    • _​_50% Condensate Flow
    • ~15% efficiency rise
  • Extraction Point for each heater
    • ​#1 from 16th Stage
    • # 2 from 14th Stage
    • # 3 from 12th Stage
    • # 4 from 9th Stage
  • Max power with 1, 2, or 3 htr strings out of service
    • _​_One: 1125 MWe
    • Two: 770 MWe
    • Three: 414 Mwe
  • Nominal ΔT across each heater
    • _​_126° into #1 Heater
    • 183° into #2 Heater (ΔT 57°)
    • 218° into #3 Heater (ΔT 35°)
    • 284° into #4 Heater (Δ 66°)
    • 319° out of #4 Heater (Δ 35°)
  • Isolation Valve operation & interlocks
    • _​_Strings have MOVs.
    • Operate in pair
    • High shell side level in #1 or #2 HTR will close
  • Location of the heaters and arrangment
    • _​_Located in “Neck” of condenser
    • A in LP
    • B in IP
    • C in HP
22
Q

Hotwell Level Control & Exhaust Spray

  • LT-114
  • LT-79
  • Hotwell makeup setpoints & process
  • Condenser reject process
  • Hi Hotwell Setpoint & Control
  • Lo Hotwell Setpoint
  • Lo-Lo Hotwell Level Setpoint & Control
  • Exhaust Hood hi-temp alarm & Trip.
    • Hood Spray Operation
Study These Flashcards
A
  • LT-114: _​_Indication on RL024
  • LT-79 Controls:
    • _​_AD-LV-79A: to open reject @ 81” (85%)
    • AD-LV-79BB: 3” Valve starts making up @ 72” (70%)
      • If level continues to go down when AD-LV-79BB is full open, AD-LV-79BA (10”) opens to restore level.
  • Hi Level @ 79.5” -> Annunciator 106C
    • Isolates HF-HV-62 SLW return.
  • Lo level @ 55.5” -> Annunciator 106B
  • Lo-Lo level @ 49.5” -> Annunciator 106A
    • 1/3 actuates alarm
    • 2/3 trips all condensate pumps.
  • Exhaust Hood Spray:
    • Alarm 176°F
    • Trip 225°F
    • Spray Full Open from 900 RPM to 10% Load
23
Q

High-High Level in Heaters

Study These Flashcards
A
  • MCB Hi-Hi Level Alarm
  • Close extraction steam MOVs (#1 & #2 have no MOVs)
  • Bleeder Trip Valves (BTVs) close (#3/4/6/7)
  • Extraction Steam Dain Valves (to condenser) Open
  • Close Inputs from Reheat Drain Tanks (#6/7)
  • Close Cascade drains from associated heaters
    • 7 -> 6
    • 4 -> 3
    • 2 -> 1
  • Isolates scavenging steam from MSR to #6/#7 Heaters
  • Condensate isolates to LP Heater Train for Hi-Hi Level in a #1 or #2 Heater Only.
24
Q

Condensate Pumps

  • Power Supplies
  • Bearings & Cooling
  • Capacity & Power Limit
  • Precautions
  • Mini-flow valves & fail position
  • Vents & seal water
  • Pump shutoff head & feeding SG w/ Condensate Pump
Study These Flashcards
A
  • Power Supplies
    • ​A & C: PB03
    • B: PB04
  • Bearings & Cooling
    • ​Upper: Oil cooled by CLC
    • Lower: Cooled by grease
  • Capacity & Power Limit Precautions
    • ​Do not exceed 55 psig @ pump suction, it may rupture expansion joint.
    • Maintain Polisher D/P 12-50 psid
    • Condensate pumps require <155°F and 15’ Head at suction for NPSH.
  • Mini-flow valves & fail position
    • ​Mini-flow valves start to open @ 2400 gpm.
    • Linearly ramp from 0-2400 gpm.
    • A to LP; B to HP; C to IP
  • Vents & seal water
    • ​Pump suction & casing vented back to HP condenser to remove vapor.
    • Startup vent on discharge returns to IP condenser
    • Seals provided by pump discharge.
      • Backup/startup supply from demin water.
  • Pump shutoff head & feeding SG w/ Condensate Pump
    • ​Shutoff head 630 psig.
    • To feed SG w/ Condensate pump, need SG Pressure < 553.4 psig (accounts for losses)
25
**_Condensers_** * Pressures * Interbottom "Rain" Curtains in each * Number of tube bundles per shell & hotwell division * Why use 3 pressures (3 reasons) * Connections to each hotwell
* 2/2.5/3" HgA Respectively * LP: 3 Curtains; IP: 2 Curtains: HP: 1 Curtain * 3 tube bundles per pass, 2 passes per shell (6 total); hotwells divided to allow for leak detection. * Why use 3 Pressures? 1. Lower average pressure seen by turbines = more work extracted. 2. Less Condensate depression when MFP exhaust reheats condensate in highest pressure area. 3. Warmer Condensate rquires less reheating steam = higher turbine work. *
26
**_MS Safeties_** * Purpose * Lift Setpoints and tolerances
* Maintain MS integrity by limiting Pstm to \< 110% design pressure with 105% design steam flow. Additionally limits RCS \< 110% design. * 1185, 1197, 1210, 1222, 1234 psig. * Setting shall be +3/-1%, must be set to ± 1% after lift check surveillance.
27
**_Condensate Xfer Pumps; Deaerator Feed Pumps; Aux Steam Feed Pumps_** * Trips/Interlocks * Power Supplies * Operation of FB-PV-29 (Isolation to RW Aux Steam Loads)
* _Condensate Xfer Pumps:_ PG17L/18L * Trip on Hi activity on FB-RT-50, Hi conductivity, or Hi Level in Condensate Recovery & Storage Tank. * _Deaerator Feed Pumps:_ PG19G/20G * Trip on Lo-Lo Level in Condensate Recovery & Storage Tank * _Aux Steam Feed Pumps:_ * Trip on Lo-Lo Level in Deaerator * _FB-PV-29:_ Auto Closes on Hi Conductivity or Rads in Condensate Recovery Tank
28
**_SG Blowdown System_** 1. Min. Flow thru throttle valves 2. BD flash tank pressure 1. When will PV-42 open to vent flash tank to atmosphere? 2. Where can BD Flash Tank Steam be sent? Concern for sending to Htrs? 3. What happens on high high flash tank level? Hi-Lo Level? 3. Interlock b/w RHX outlet to HDT (BM-TV-40) and SUFP Suction (AE-HV-102)? 4. Demin max flow rate, where can demins be sent? 5. What will trip the discharge pump? 6. What will close the discharge pump flow control valve?
1. 5800 lbm/hr 2. 170 psig 1. 200 # (Uncontrolled release path) 2. FW Htr 5A/5B, condenser atmoshpere, or HDT. If turbine secured can sauce it to turn at low speed. 3. Hi-Lo Level generates BSPIS -\> Closes BM-HV-1-8 1. (Hi-Hi 76%) 2. (Hi-Lo 63%) 3. Prevents starting SUFP unless BM-TV-40 is closed. If SUFP suction or discharge is opened BM-TV-40 closes. 4. 20 psid, 75,000 lbm/hr thru demin, 125,000 lbm/hr thru parallel demins. Condenser (Normal), CST, or Surge Tank. 5. Low Surge Tank Level, and high rad on RE-25. 6. Low dilution flow on plant discharge and high rad on RE-25.
29
**_Inputs & Outputs of Each Drain Tank & Heater_** * MSR * MSDT (A/B/C/D) * 1st Stage Reheat Drain Tand (A/B/C/D) * 2nd Stage Reheat Drain Tank (A/B/C/D) * #7 Heater * #6 Heater * #5 Heater * #4 Heater * #3 Heater * #2 Heater * #1 Heater
30
**_BIS_** Blowdown Isolation System - not be be confused w/ SGBIS) * Causes * Valves
**_Causes_** * SGBD Non-Regen H/X outlet \> 140°F by BM-TSH-73 **_Closes_** * Blowdown Isolation Valves BM-HV-01 thru 04
31
**_Startup MFP_** * Flow, current, and power rating * Flowpath * Cooling * Power Supply
* 600 gpm, 39A (46A for short duration), ~1% * Suction from SGBD Regen H/X & discharges to feed header. SGBD Regen H/X outlet may only be aligned to either SUFP _OR_ HDT. * SW cools the SUFP bearings & Seal Water H/X
32
**_MFP Trips_** * Single Pump Trips * Dual Pump Trips
**_Single MFP Trips_** (LLLOW) * **_L_**ow LO Press (pump) - 4 psig * **_L_**ow LO Press (turbine) - 4 psig * **_L_**ow Exhaust Vacuum - 2/2 * 15.32 HgV (14.6 HgA) * 14.32 HgV (15.6 HgA) * **_O_**verspeed * Electrical: 5880 RPM * Mechanical: 6098-6222 RPM * **_W_**ear on Thrust Bearing - 2/2 +30/-40 Mils **_Dual MFP Trips_** (FLASH) * **_F_**eedwater Isolation Signal (FWIS) * **_L_**evel Hi-Hi in S/G (P-14) - 91% on 2/4 LTs on 1/4 SGs * **_A_**ll Condendsate Pumps Trip * **_S_**afety Injection Signal (SIS) * **_H_**i MFP Discharge Pressure - 1900 psig on 2/3 PTs
33
**_Instrument Air Componenets_** * Operation of KA-PV-0011 * Operation of KA-FV-0029 * Flow Orfices * When will AOVs fail closed (at what pressure)?
* Closes at 110 psig sensed on outlet of dryers, isolating service air from instrument air. Must be bypassed until \> 115 psig and jacked open. * Supplies instrument air to CTMT. Closes on CIS-A signal or loss of air (~80 psig). Branches off supply line to Aux Bldg. * Each branch supply is equipped with an orifice to limit flow to 525 scfm to ensure a break stays within the capacity of one compressor. * AOVs fail at approximately 80 psig.
34
**_Instrument Air System Response on Lowering Pressure_**
As air pressure lowers from 120 psig: * Lead compressor starts at 119 psig * Lag compressor starts at 117 psig * Standby compressor starts at 115 psig. * KA-PV-11 closes @ 110 psig to isolate service air header * Standby air dryer in service at 105 psig downstream of dryer * Valves fail to "fail" position at ~ 80 psig. * EF-HV-33/34 fail closed isolating ESW to Instrument Compressors 'A' & 'B', whic must be manually restored. \*\* Heater drain recircs fail open to avoid SG low level trip, reduce power to \< 80%. \*\* Eventually a Pressurizer High Level trip will occur from a loss of letdown.
35
**_N2 Accumulators (Instrument Air)_** * What each accumulator does. * Mission Time * T/S 3.7.3 and 3.7.4 requirements * Normal pressure setting
* Five Total: * One accumulator for each ASD & associated TDAFP flow control valve (4 total) * One for the MFRVs (1 Total) * Also supplies the MFP Recric valves * ASD/TDAFP: T/S minimum 600 psig for 5 hr supply. Check valve leakage \< 47.2 psig per T/S 3.7.4 in Modes 1-3. * MFRVs: T/S minimum 400 psig per T/S 3.7.3 in Modes 1-3 for a 4 hour supply. * 700 psig for ASDs/TDAFP * 700 psig for MFRVs
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**_FWIS_** * Causes * How to Reset * What a FWIS does
**_FWIS_** * SIS * Lo-Lo SG Level - 17% 2/4 LTs on 1/4 SGs * P-4/564 - P-4 and 2/4 Tavg 564°F * P-14 Hi-Hi SG Level - 91% on 2/4 LTs on 1/4 SGs **_How to Reset_** * _SI and P-14:_ FWIS Sealed in by P-4 * Initiating condition clear/reset _and_ RTBs must be closed to reset. * _SG Lo-Lo Level:_ FWIS resets once SG Low Level condition clears * _P-4/564:_ Reset Button on RL018 (Initiating condition not required to be clear) **_What an FWIS Does:_** * _Closes:_ * FWIVs * MFRVs * MFRBVs * FW Chemical Injection Valves * _Trips Both MFPs_

ILT 2022 (6 decks)

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