ECCS LP

Card Set Information

Author:
canoe
ID:
88832
Filename:
ECCS LP
Updated:
2011-06-02 17:14:46
Tags:
Nuclear
Folders:

Description:
From Lesson Plan in Order
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user canoe on FreezingBlue Flashcards. What would you like to do?


  1. SI Setpoints - General
    • PZR Pressure
    • Steamline Pressure
    • Containment Pressure
    • Manual
  2. SI Setpoints - PZR Pressure
    < 1829 psig
  3. SI Setpoints - Steamline Pressure
    < 640 psig
  4. SI Setpoints - Containment Pressure
    > 3.4 psig
  5. SI Setpoints - Manual
    If it does not automatically actuate it can be manually triggered
  6. ECCS - Purpose
    Maintain Rx coolant inventory in order to protect against grosss failure of the fuel cladding

    Minimize core damage due to excessive temperature following a LOCA

    Provide additional shutdown capability in the event of a Main Steam system break
  7. ECCS - Design Basis
    Limit H2 production to < 1% of total possible from zircwater reaction

    Maintain clad oxidation <17% of total clad thickness

    Limit peak clad temperature <2200F

    Maintain coolable core geometry

    Long term core cooling
  8. ECCS - Unique Components
    • Safety Injection pumps
    • Pressurized accumulators
    • Containment Recirculation Sumps
  9. ECCS - Shared Components
    • Charging pumps
    • RHR pumps
    • RHR Heat exchangers
    • RWST
  10. ECCS - Normal Aligned to
    Auto inject on an SI signal
  11. RWST - Function
    Supply borated water for ECCS operations or filling of the refueling cavity
  12. RWST - Construction
    Concrete tank with a Stainless Steel liner
  13. RWST - Venting
    Vented to filtered ventilation and vacuum breaker at 8" of water
  14. RWST - Heater Location
    Located in RWST tunnel
  15. RWST - Location
    Between containments, outside of fuel handling building
  16. RWST - High Alarm
    96%
  17. RWST - Low Alarm
    90%
  18. RWST - Low-2 Alarm
    46.7%
  19. RWST - Low-3 Alarm
    12%
  20. Order of Pump Shutoff Head
    • CV @ 2600 psig
    • SI @ 1500 psig
    • RH @ 200 psig
  21. CV Pumps - Purpose
    Pump water from RWST to RCS at system pressure
  22. CV Pump - Description
    10 stage centrifugal pump
  23. CV Pump - Shutoff Head
    2600 Psid
  24. CV Pump - Flows
    • 150 GPMs @ 2500 Psid
    • 550 GPms @ 600 Psid
  25. CV Pump - Lubrication
    • Motor Driven Gear Pump
    • Cooled by SX
  26. CV Pump - Location
    364' Aux. Building inside cubicle
  27. SI Pump - Purpose
    Pump borated water from RWST to RCS when RCS pressure drops below pump shutoff head
  28. SI Pump - Description
    10 Stage centrifugal
  29. SI Pump - Shutoff Head
    1500 Psid
  30. SI Pump - Flows
    • 400 GPMs @ 1200 Psid
    • 650 GPMs @ 800 Psid
  31. SI Pump - Lubrication
    • Shaft driven gear type pump
    • Cooled by SX
  32. SI Pump - Location
    364' Aux. inside cubicle
  33. SI Pump - Purpose of Discharge Relief Valve
    Prevents overpressure due to check valve back-leakage
  34. SI Accumulators - Purpose
    • Provide an immediate source of borated water to the reactor core in the event of a large RCS pipe rupture
    • Provides initial surge of cooling water during large RCS pipe ruptures
  35. SI Accumulators - Capacity
    10,100 gallons
  36. SI Accumulators - Cb
    2200-2400 Ppm
  37. SI Accumulators - Level
    • 31 to 63%
    • 6995 to 7217 Gallons
  38. SI Accumulators - Pressure
    602 to 647 Psi
  39. SI Accumulators - Connected To
    • Cold leg of the RCS
    • Isolated by 2 check valves
  40. SI Accumulators - Contents
    • Pressurized with Nitrogen
    • Partially filled with Borated Water
  41. SI Accumulators - Can Drained to
    RWST or AB HUTs
  42. SI Accumulators - When is it isolated
    When RCS pressure is less than 1000 psig
  43. SI Accumulators - Changing Cb
    Can be bled and fed with the SI pumps to change Cb
  44. SI Accumulators - Location
    426' Level on Containment
  45. RHR Pumps - Function
    • Deliver reactor coolant flow through the RHR heat exchangers to meet plant cooldown requirements
    • Supply borated water to the RCS, the suction of the Centrifugal CV pumps and the suction of the SI pumps during an ECCS actuation
  46. RHR Pumps - Description
    Vertically Mounted centrifugal pumps
  47. RHR Pumps - Shutoff Head
    200 Psid
  48. RHR Pumps - Flow
    • 3000 GPMs @ 165 psid
    • 5000 GPMs @ 125 psid
  49. RHR Pumps - Location
    346' Aux. in cubicles
  50. RHR Heat Exchangers - Function
    Transfer reactor decay heat to the Component Cooling Water System
  51. RHR Heat Exchangers - Description
    Two vertically mounted shell and U-tube heat exchangers
  52. RHR Heat Exchangers - Tube Side
    RCS
  53. RHR Heat Exchangers - Shellside
    Component Cooling Water
  54. RHR Heat Exchangers - During ECCS
    Borated water flows through tubeside
  55. RHR Heat Exchangers - Location
    364' to 383' Aux. Building in cubicle
  56. CONTAINMENT Recir Sump - Purpose
    Collect water from a RCS rupture for reuse by ECCS
  57. CONTAINMENT Recir Sump - Description
    • Two sumps in each containment
    • Covered by Screen to minimize blockage
    • 114" Deep
  58. CONTAINMENT Recir Sump - Connected To
    Suction of RHR pump and Containment Spray pump
  59. CONTAINMENT Recir Sump - Location
    377' Inside Containment
  60. ECCS Interconnections - Systems
    • RCS
    • CVCS
    • AB
    • RHR
  61. ECCS Interconnections - RCS
    • CV pumps discharge to the cold legs via a common header. This is the HIGH HEAD safety injection flowpath
    • Accumulators, RHR pumps and SI pumps discharge to the RCS cold legs via common headers. This is the LOW HEAD safety injection flowpath.
    • RHR pumps and SI pumps can also discharge to the RCS hot legs
  62. ECCS Interconnections - CVCS
    • During the injection phase, the CV pumps take a suction on the RWST and discharge to the RCS cold legs
    • During the recirculation phase, CV pump suction is shifted to take water from the outlet of the RHR Hx.Discharge is still to the RCS cold legs.
  63. ECCS Interconnections - AB
    • All ECCS pressure relief valves (except the accumulators) relieve to the AB HUT’s
    • Accumulators can drain to the AB HUT’s or the RWST.
  64. ECCS Interconnections - RHR
    • During the injection phase, the RH pumps take a suction on the RWST and discharge to the RCS cold legs
    • During recirculation phase, the RH pumps take a suction on their respective containment recirculation sump.
    • 1A RH pump discharges to the CV pump suction
    • 1B RH pump discharges to the SI pump suction, and both pumps discharge to the RCS.
  65. ECCS Support Sytems - List
    • AC
    • DC
    • IA
    • CC
    • Nitrogen
    • SX
  66. ECCS Support Sytems - IA
    AOVs
  67. ECCS Support Sytems - CC
    • Shaft seal cooler of the RHR pumps
    • Removes heat from RHR Heat Exchangers
  68. ECCS Support Sytems - SX
    • CV pump gear oil coolers
    • CV and Si pump lube oild coolers and cubicle coolers
  69. ECCS Valves - Loss of DC or IA
    AOVs will fail in a safe position
  70. ECCS Valves - SVAG stands for
    Spurious Valve Actuation Guidelines
  71. ECCS SVAG - Description
    Manually controlled, electrically operated valves where a single failure can result in performing an undesireable mechanical motion.
  72. ECCS SVAG - Avoiding
    Disconnect power to these valves after they are manipulated to the correct position
  73. ECCS Operation - When are you in Standby
    System aligned to auto inject at RCS temperatures > 350 degrees
  74. ECCS Operation - Standby
    With the reactor in any other condition other than cold shutdown, the ECCS is aligned to automatically inject water from the SI accumulators and the RWST to the RCS cold legs
  75. ECCS Operation - Phases
    • Injection
    • Cold Leg Recirculation
    • Hot Leg Recirculation
  76. ECCS Operation - High Head Injection
    RWST | to | CV pumps | discharge to a common header | to all 4 RCS cold legs.

    RWST | to | SI pumps | to all 4 RCS cold legs
  77. ECCS Operation - Low Head Injection
    RWST | to | RHR | through | RHR Hx’s. (No CC water through the RHR Hx during injection phase) | mixes with | SI pumps | discharges to | All four COLD Legs

    SI accumulators | mixes with | RHR and SI pump | discharges to | All four COLD Legs
  78. ECCS Operation - Cold Leg Recirculation Initiation
    RWST Low-2 alarm
  79. ECCS Operation - Cold Leg Recirculation
    CNTM Sump | to | RHR Pump | to | RHR Hx – CC removes heat | to | RCS cold legs, CV and SI Suction | Drains to | CNTM Sump

    CV and SI Suction | to | RCS cold legs | Drains to | CNTM Sump
  80. ECCS Operation - Hot Leg Recirc
    CNTM Sump | to | RHR Pump | to | _A RHR Hx – CC removes heat | to | _A and _C hot legs, and to the suction of the CV pumps

    CV pumps still injecting into Cold Legs

    CNTM Sump | to | RHR Pump | to | _B RHR Hx – CC removes heat | to | suction of the SI pumps

    _A SI pump | to | _A and _D hot legs

    _B SI pump | to | _B and _C hot legs
  81. ECCS Operation - Hot Leg Recirc Purpose
    Increases Core flow (assuming Cold Leg break)

    Prevent boron plating out (due to boiling) which would: Block flow Channels and Reduce heat transfer.

    Initiated after Cold Leg Recirc at 5 hrs 50 mins after SI (with 20 min completion time)
  82. ECCS Operation - Steamline Rupture Purposes
    Adds borated water to counteract (+) reactivity added by cooldown

    Adds mass to RCS to counteract the volume reduction due to cooldown

    Feedwater Isolation to minimize cooldown
  83. ECCS Operation - Steamline Rupture Cautions
    RCS pressure may remain near NOP due to no RCS leakage

    Continued operation of CV pumps will cause PZR PORV to lift
  84. ECCS Operation - Steamline Rupture Termination
    SI will be manually terminated
  85. RWST Heater - Purpose
    Circulates the contents of the RWST for samples and temperature control
  86. RWST Heater - Tempurature Concerns
    • < 35 degrees operability due to freezing
    • > 100 degrees ability to remove heat
  87. RWST Heater - CNTRL in AUTO
    AUTO—the pump and heater cycle on and off based on temperature in the RWST. The pump and heater start at 58°F decreasing and stop at 65°F increasing.
  88. RWST Heater - CNTRL in OFF
    Heater and Pump are not running
  89. RWST Heater - CNTRL in START
    Pump runs but heater is off

What would you like to do?

Home > Flashcards > Print Preview