LC20 Systems RCS

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texasaggienuke
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87472
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LC20 Systems RCS
Updated:
2011-05-25 08:54:57
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Incore RCS CVCS Pumps Demin RMUW Boron PZR ABN
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LC20 Systems RCS Study Cards
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  1. RCP Seal Injection Flowrates
    5 gpm down the shaft thru thermal barrier heat exchanger

    3 gpm up the shaft lubricating radial bearing and leaking through No. 1 Seal
  2. Natural Circulation Verification
    From EOS-0.1A:

    1. RCS Subcooling > 25F (55F for Adverse Containment)

    2. SG Pressures - Stable or Decreasing

    3. CET - Stable or Decreasing

    4. RCS Cold Leg Temp - At Saturation Temp for S/G Pressure

    5. RCS Hot Leg Temp - Stable or Decreasing
  3. What controls are on the RSP for RCP?
    Indications Only for the 4 RCPs
  4. Permissive Interlock in RCP Motor
    Oil pressure reaches 600 psig
  5. Criteria for opening No. 1 Seal Bypass Valve
    The No. 1 Seal Bypass Valve should opened only if all the following conditions are met:

    • a. RCS pressure is between 100 and 1000 psig
    • b. No. 1 Seal Leakoff Valve is opened
    • c. No. 1 Seal Leakoff flowrate < 1 gpm
    • d. Seal Injection Water flowrate to each RCP >= 8 gpm

    Note: Do not open #1 Seal Bypass Valve unless either: Pump Bearing Temp approache 225F or #1 Seal Water Inlet Temp approaches 235F (even if the preceding criteria are met).
  6. When to start an RCP
    NEVER start an RCP in Mode 1 or 2 (SOP 108A)
  7. RCP start in Mode 5 with PZR steam bubble
    dP must be mainted at 250 psid across the No. 1 Seal when pumps are started with a PZR steam bubble
  8. RCP start in Mode 5 with PZR solid or MODE 3 or 4
    dP must be mainted at 200 psid across the No. 1 Seal when pumps are started with PZR solid OR in MODE 3 or 4.

    NOTE: RCS pressure of ~325 psig ensures NPSH to RCP
  9. Pump Bearing Temperature
    (Seal Water Bearing Temp)
    225F Max
  10. Lower Motor Bearing Temp
    190F Max (195F Alarm and Trip)
  11. Upper Motor Bearing Temperature
    190F Max (195F Alarm and Trip)
  12. Motor Stator Winding Temp
    300 Max (Alarm and Trip)
  13. Seal Water Inlet Temp
    235F Max
  14. At what flowrate and why is Seal Injection Flow to RCP important?
    • 6 gpm
    • To prevent high temp water from reaching No. 1 seal
  15. State the primary function of the RCS
    Remove heat generated in the fuel from the controlled fission process and tranfer the heat to the MSS via S/G.
  16. State the five secondary functions of the RCS
    • 1. Remove head generated in the fuel due to fission product decay.
    • 2. Act as a carrier for Boric Acid
    • 3. Act as a second barrier against fission-product release to the environment. (Cladding, RCS, Cntmt)
    • 4. Improve the neutron economy by acting as a reflector
    • 5. Increase the probability of fission by moderating the neutron energy level to the thermal state.
  17. Tavg

    Thot

    Tcold

    Pressure

    Capacity

    Flow Rate
    Tavg = 585F (589F)

    Thot = 618F (620F)

    Tcold = 556F (559F)

    Pressure = 2235 psig

    Capacity = 95,000 gal (91,000 gal)

    Flow Rate = 410,000 gpm (390,000 gpm)
  18. Core Bypass Flow
    Total of 6% Bypass Flow:

    • Nozzle Bypass Flow (1%)
    • Baffle Wall Bypass Flow (0.5%)
    • Head Cooling Bypass Flow (0.5%)
    • Control Rod and Instrument Thimble Bypass Flow (2%)

    NOTE: ~94% goes from Cold Leg to Hot Leg
  19. "PZR Spray Lines" connection to RCS
    Loops 1 & 4 Cold Legs
  20. "Charging Flow from CVCS" connection to RCS
    Loops 1 & 4 Cold Legs
  21. "ECCS Flow" connection to RCS
    Connects to each Cold Leg during SI
  22. "CCP flow" connection to RCS
    Each Cold Leg during SI
  23. "SIP Injection" connection to RCS
    All four Hot Legs
  24. "RHRP Injection during Hot Leg Recirc Phase" connection to RCS
    Hot Legs 2 & 3 during SI Hot Leg Recirc Phase
  25. "RHRP during Cold Shutdown Operations" connection to RCS
    • All four Cold Legs (Injection)
    • Hot Legs 1 & 4 (Suction)
  26. "PZR Surge Line Connection" connection to RCS
    Loop 4 Hot Leg
  27. "Normal CVCS letdown" connection to RCS
    Loop 3 Intermediate Leg
  28. What is RCS Intermediate Leg (aka Cross-over Leg)?
    Between RCP and S/G
  29. Where is RCS Hot Leg?
    Between Rx and RCP
  30. Where is RCS Cold Leg?
    Between RCP and Rx
  31. "Excess Letdown" connection to RCS
    Loop 1 Intermediate Leg
  32. Design Temp for RCS (minus PZR and its Surge Line)
    650F
  33. Design Temp for PZR and Surge Line
    680F
  34. Design Pressure of RCS Piping and Components
    2485 psig (minus PRT, discharge piping from the PZR PORVs and Safety Valves)

    • PRT:
    • PORV: 2335 psig
    • Safety: 2485psig
  35. Reactor Vessel Components
    • Reactor Vessel
    • Closure Head
    • Lower Internals
    • Upper Internals
    • Instrumentation Support Assembly
  36. PZR Saturation Temp
    653F
  37. PORV Lift
    2335 psig
  38. Rx Vessel Head O-Ring Leakoff Alarm
    140F - Alarms on MCB
  39. Which o-ring is normally in service?
    Inner O-Ring
  40. Where is o-ring leakage directed to?
    RCDT
  41. Actions for leaking O-Ring
    • If inner o-ring leaks:
    • put second o-ring in service by NEO closing uRC-8069B (NO) and opening uRC-8069A (NC)
  42. Core Baffle Bolt dTemp
    72F measured by RHR
  43. Max RCP design flow
    105,000 gpm

    Note: Pump develops 288 ft of head at 100,600 gpm.
  44. Seal Injection Flow
    • Flow provided by CVCS at:
    • Higher Pressure (2400 psig)
    • Lower Temp (115F)
    • 8 gpm (3 gpm up and 5 gpm down)
  45. #1 RCP Seal
    • Film-riding seal
    • Supplies the No. 2 Seal
    • Excess Flow goes to Seal Water HX in CVCS (CCP Suction): 3gpm
    • Pressure: 2400 psig to 50 psig
  46. #2 RCP Seal
    • Face-rubbing seal
    • Leakage joins with the outer dam lkg of #3 Seal
    • Piped to RCDT: 3 gph
    • Pressure: 50 psig to 4 psig
  47. #3 RCP Seal
    • Face-rubbing seal
    • Pressure: 10 psig
    • Cntmt Sumps: 400 cc/hr
    • RCDT: 400 cc/hr
  48. RCP Control Power Source

    RCP Power Source
    RCP CP: uD3-1

    RCP Motor Power: uA1 through uA4
  49. Non-Safeguards Power Supply
    • Normal Ops: uUT
    • Outage: uST
  50. #1 Seal Bypass
    • Only ONE #1 Seal Bypass Valve
    • All four RCPs share a common Header

    Note: All four RCPs have individual #1 Seal Leakoff Valves
  51. RCP Flywheel
    Extends coastdown on loss of all AC and prevents de-energized pump from rotating backwards due to reverse flow

    Mounted on top of the rotor shaft
  52. What happens on Loss of Control Power
    • If closed, breaker remains closed
    • If open, cannot close breaker
    • Cannot trip breaker from the CR
  53. Cooling Medium for RCP
    • CCW cools:
    • Pump via Thermal Barrier
    • Motor via Air
  54. Oil Lift System
    1. Permissive Interlock requires the oil lift pressure to reach 600 psig BEFORE RCP can be started.

    2. One minute after RCP begins operation, oil lift pump is secured.

    3. Oil pump is not needed when stopping the RCP
  55. What RCP control are on Remote S/D Panel (RSP)?
    There are NO controls, ONLY indication!
  56. Process To Start RCP
    • 1. Oil Lift Pump handswitch to Start
    • 2. Lift Oil Pressure > 600 psig
    • 3. No 86M
    • 4. Breaker in CONNECT
    • 5. MCB handswitch to Start
  57. SOP-108 Precautions/Limitations
    • 1. RCP shall not be started in MODE 1 or 2.
    • 2. RCP should not be operated continuously until the RCS has been vented.
    • 3. Maintain minimum of 15 psig in the VCT to ensure effective backpressure on the RCP #1 Seal and provide proper lubrication of the #2 Seal.
    • 4. Frequent start/stop can damage motor windings.
    • a. Two successive starts are permitted (5 minutes)
    • b. Third start may be made by running a period of 20 minutes or standing idle for a period of 45 minutes.
    • c. Only one RCP is started at any one time.
    • 5. Seal Injection flow to each RCP must be >6 gpm to prevent high temp water from reaching #1 Seal
    • 6. Seal Leakoff flow must be >= 0.2 gpm from #1 seal at ALL times
  58. Temps during Normal RCP Operation
    Lower Seal Water (Pump Radial) Bearing Temp: 225F Max

    Seal Water Inlet Temp: 235F Max

    Lower Motor (Radial & Thrust) Bearing Temp: 195F (Alarm and Trip)

    Upper Motor (Radial & Thrust) Bearing Temp: 195F (Alarm and Trip)

    Motor Stator Winding Temp: 300F Max (Alarm and Trip)

    RCP #1 Seal Injection Water should not exceed 130F

    CCW to RCP oil and air cools and thermal barriers should not exceed 105F
  59. PZR Thumbrule
    • 50 gal per 1%
    • Volume: 1800 ft3
  60. PZR Level (No Load)
    25%
  61. PZR Level (Full Load)
    60%
  62. "PZR Spray" connection to RCS
    Cold Legs 1 & 4
  63. "PZR Surge Line" connection to RCS
    Hot Leg 4
  64. "CVCS Letdown" connection to RCS
    Intermediate Leg 3
  65. "CVCS Excess Letdown" connection to RCS
    Intermediate Leg 1
  66. "CVCS Charge" connection to RCS
    • Cold Legs 1 & 4
    • Alternates between outages
  67. PZR Control Bank
    • Charleigh:
    • 18 heater elements
    • 416 kW heat capacity
  68. PZR Backup Heaters
    A, B, and D

    • A, B (Can be operated from RSP):
    • 21 heater elements
    • 485 kW heat capacity

    D: 18 heater elements, 416 kW heat capacity
  69. 3 Auto Trip for PZR heaters
    • 1. SI
    • 2. Low Level (17%)
    • 3. Low Bus Voltage
  70. PZR Spray Valves (2)
    • 1. CL 1 & 4
    • 2. Capacity: 450 gpm each
    • 3. Air Operated, FC on loss of air or power
    • 4. Manual Bypass Valves allow ~1 gpm of spray (this prevents thermal shock to spray nozzle and keep chem & boron at RCS equilibrium)
  71. Auxiliary PZR Spray Valve
    • 1. Spray comes from CVCS through u-8145 from CCP discharge
    • 2. Depressurizes and cools PZR when RCPs aren't running
    • 3. Procedural Limits apply to reduce risk of thermal shock to spray line and nozzle
  72. PZR PORVs (2)
    • Lift at 2335 psig
    • FC on loss of nitrogen or power
    • Discharge to PRT through Common Line
    • Minimize challenges to PZR Safety Valves
    • Used for Low Temp Overpressure Protection (LTOP)

    Note: Some ERGs require PORVs to depressurize RCS when RCPs are not running
  73. Hi Pressure Rx Trip
    2385 psig
  74. PZR Safety Valves (3)
    • Provide RCS overpressure protection
    • Setpoint 2485 psig
    • Like PORVs, Safeties discharges to PRT thru common hdr

    **** NOTE: POSITION is the ONLY indication for Safeties on the MCB!!! ****
  75. PZR Relief Tank (PRT)
    Indications (MCB): Pressure, Level, and Temp

    Protected by two rupture discs (91 psid)

    Filled (64-88%) with RMUW with N2 blanket and maintained <113F.

    Discharge to PRT is thru sparger BENEATH water lvl

    Internal spray and drain are used to cool tank after discharge
  76. RVLIS
    • Measures RCS Inventory and Temp (above upper core plate)
    • Detects approach to inadequate core cooling

    • 2 probe assemblies located in the proximity of CL inlets
    • 8 discrete elevations about the core plate
  77. How does RVLIS work?
    • 1. Normal dTemp between heated and unheated junctions is 90-130F.
    • 2. When water level falls, reduced Qdot of the surrounding steam causes the dTemp to increase.
    • 3. This increase indicates the presence of a void in the upper vessel head.
  78. How is RCS Level detected?
    • 1. RVLIS
    • 2. Mansell Level Monitor
    • 3. Differential Pressure Transmitters (3):
    • -Extended Wide Range (above PZR lower level tap)
    • -Wide Range (above vessel flange)
    • -Narrow Range (RCS loop piping)
  79. When is RCS Loop OPERABLE?
    • RCP is OPERABLE
    • S/G Level is at 38% NR (U1) or 10% NR (U2)
  80. UNIT DIFFERENCE
    Unit 1 vs Unit 2 S/Gs
    • Unit 1 (Model Delta 76) has Elevated Feedring
    • Unit 2 (Model D-5) has Stainless Steel Preheater
  81. ABN-103
    Excessive Rx Coolant Leakage
  82. ABN-108
    Shutdown Loss of Coolant
  83. ABN-101 Trips / Malfunctions
    • Hi/Lo Lube Oil Level
    • - Bearing Temp >=195F

    • RCP Vibration
    • - Shaft 15 mils increasing at >1 mil/hr or 20 mils
    • - Frame 3 mils increasing at >0.2 mils/hr or 5 mils

    Loss of Seal Injection (CCW flow to thermal barriers must be > 35 gpm)

    Can operate with #2 or #3 Seal failure if other parameters (vibrations, temps, etc) are within limits
  84. RCS Startup (Cold Shutdown to Hot Standby)
    • MODE 5 - 3
    • Vacuum fill RCS with borated water
    • Establish RCS Chemistry
    • Draw PZR bubble
    • Pressurize and H/U RCS
  85. RCS Shutdown (Hot Standby to Cold Shutdown)
    • MODE 3 - 5
    • Borate to Cold Shutdown
    • Cooldown to 350F using Steam Dumps
    • Cooldown to <350 using RHR
  86. RCS Refueling
    • MODE 6
    • Cooldown to < 140F
    • RCS Level Monitoring Systems in service
    • Rx Vessel Head removed
  87. RCS Normal (Power Operations & Hot Standby)
    • MODE 1 & 2
    • Power Operations includes:
    • Steady State
    • Ramp changes < 5% per minute
    • Step changes of 10%
    • Step load decreases with Steam Dumps < 50% RTP
    • Power < 15%: Rx is controlled manually
    • Power > 15%: Rx Control System controls

    Hot Standby: RCS subcritical & Tave maintained at 557F

    • NOTE:
    • RCS pressure at 2235 psig
    • PZR level controlled by CVCS
  88. PZR Pressure Control (Going Up)
    • High Pressure Trip: 2385 psig
    • PORV Opens: 2335 psig
    • Spray Valves Full Open: 2310 psig
    • Spray Valves Start Open: 2260 psig
    • Variable Heater Off: 2250 psig
    • NOP: 2235 psig
    • P-11: 1960 psig
  89. PZR Pressure Control (Going Down)
    • PORVs Closed: 2315 psig
    • B/U Heater On: 2210 psig
    • PORVs Blocked: 2185 psig
    • P-11: 1960 psig
    • Low Pressure Rx Trip: 1880 psig
    • Low Pressure SI: 1820 psig
  90. Hot Loop Position
    • Fail to accelerate
    • Locked Rotor
  91. How many CETs does each unit have?
    50
  92. N-16 Detectors
    • Installed on each Hot Leg:
    • Reactor Power
    • Input to Tave
    • Low DNBR and High kW/ft calculators (generate high power Rx Trip and Runback signals)
  93. Subcooled Margin Monitor
    Compares WR RCS Pressure with the highest CET and RCS temps
  94. Coolant Flow
    Measured by three DP signals

    Low flow signal actuates an alarm

    2/3 coincedence per loop: Rx Trips
  95. NR Cold Leg Temp
    Two fast response RTDs in each cold leg

    Provide indication and input to calculate Tave
  96. Tave Control
    • Tave are averaged
    • Used for auto control:
    • - PZR level
    • - Steam Dumps
    • - Control Rod movement
  97. Tave - Tref Deviation
    • Derived from turbine inpulse pressure and Tave
    • Tave - Tref used for:
    • - Steam Dumps and
    • - Control Rod Movement
  98. Cold & Hot Leg WR Temps
    RTDs used for indication and input signals to LTOP System
  99. WR Rx Loop Pressures
    • WR Pressures used for:
    • - Post-accident operations
    • - Input to LTOP system
    • - Input for open permissive signals to RHR system loop isolation valves interlock circuits
  100. PZR Instrumentation
    • Two detectors (one in steam, one in water)
    • Surge Line Temp
    • Spray Line Temp
    • Safety and PORV Discharge Temp
    • Level
    • Pressure
  101. PRT Instrumentation
    • PRT:
    • - Temp
    • - Pressure
    • - Level

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