Systems Review

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Systems Review
2011-09-15 16:39:39
Systems Review Cert

BWR Systems Review for Cert Class
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  1. The reactor was operating at rated conditions when the 11 Recirc pump tripped. 3 minutes later, Total Core Flow is 38x106 lbm/hr. Actual flow is assumed to be...

    A. higher than indicated due to reverse flow.
    B. lower than indicated due to lower power resulting in lower core dP.
    C. same as indicated due to flow logic.
    D. lower than indicated due to reverse flow.
    D. lower than indicated due to reverse flow.

    After 3 minutes, the running recirc pump will be driving reverse flow in the idle loop. This reverse flow is seen by the flow meters and is added to the running loop forward flow, making indicated flow appear higher than actual.
    (this multiple choice question has been scrambled)
  2. The plant was operating at rated conditions when a loss of NORMAL offsite power occurs concurrent with an ECCS intitiation signal. What is the reason for the load shed of selected loads?

    A. reduce power supplying requirement of ONLY the EDGs.
    B. reduce the power supplying requirement of 1AR or the EDGs.
    C. allow the EDG to reach operating speed before accepting load.
    D. prevent a negative sequence trip of the essential busses upon load restoration.
    B. The 1AR transformer and EDGs are limited in capacity and are primarily intended to supply safeguard loads.
    (this multiple choice question has been scrambled)
  3. Explain how the D54 Swing Charger interlock works with chargers D52 and D53 in the Div 1 250 VDC Battery 13...
    A mechanical interlock exists such that the standby charger (D54) can only take the place of one of the two normal chargers in the event one fails.
  4. What is the cooling medium for the RBCCW system?

    A. Service Water
    B. Cond Service Water
    C. Circ Water
    A. Service Water
    (this multiple choice question has been scrambled)
  5. What Tech Specs are required to be entered if 2R is out of service and 1ARS is supplying 1AR?
    • None.
    • Required off-site circuits are available.
    • Tech Spec 3.8.1 requires two qualified off-site circuits.
  6. What load center cross-ties have automatic closure logic?

    LC-101 to LC-102?
    LC-103 to LC-104?
    LC-107 to LC-108?
    LC-109 to LC-102?
    All EXCEPT LC-103 to LC-104.
  7. When operating in the Open Cycle mode, what is the limit for lowering discharge canal temperature?
    When upstream temp is below 50F, the limit is that the discharge canal temp can not be lowered by more than 5F per hour
  8. What are you required to do if a fuel assembly or bundle is dropped in either the fuel storage pool or the reactor vessel?
    Immediately clear the refueling floor of ALL personnel. Do not attempt to pick up or move the fuel.

    This is regardless of whether the rad levels have changed or not.
  9. What will give you a Main Turbine lockout, and what are their setpoints?
    Mon, Tues, Wed are Very Much 4 Golf

    • Moisture Sep Tank @ 927' 6"
    • Thrust Bearing wear @ 0.030 to 0.035"
    • Water Level of +48" RPV
    • Vacuum Low of 20" hg
    • Mechanical/Manual with Control Switch
    • Generator loss of field
    • Generator lockout
    • Gen Stator loss of cooling
    • Gen negative sequence
  10. What are the Group II isolation signals, and how does it affect:
    A - Shutdown cooling?
    B - Torus cooling?
    Group II isolation signals are +9" RPV and 1.84# Drywell.

    • Shutdown cooling will be isolated
    • Torus cooling will not be affected
  11. What SRVs use Instrument Nitrogen for their normal pneumatic supply?
    What is their safety related pneumatic supply?
    Instrument Nitrogen supplies ALL SRVs

    • Alternate Nitrogen is the backup for SRVs
    • A, B, C, E, F, H (NOT D or G)
    • D and G use Accumulators
  12. How will an ADS or Lo-Lo Set SRV be affected by a leaking bellows?
    Only the safety function of the valve is affected since the self actuation setpoint will change due to the leaking bellows.

    The valve can still perform its ADS or Lo-Lo Set function and can be operated manually.
  13. What is the source of stack dilution air? What changes with this source on a secondary containment isolation?
    V-EF-26, from SJAE room, provides stack dilution air.

    On a secondary containment isolation, this is rerouted to the RB exhaust plenum, causing radiation levels to rise.
  14. What is the RWCU system response on an initiation of SBLC? Group III?
    Primary Containment Group III Isolation signals, or initiation of the Standby Liquid Control System, closes valve MO-2399 and Primary Containment Isolation valves MO-2397, MO-2398, CV-2790 and CV-2791. The RWCU pumps will trip due to valve closure.
  15. Can SBLC be initiated locally at the pumps?
    • No.
    • You can only start/stop the pumps locally. Operation of the SQUIB valve must be done from the control room or from an auto signal.
  16. What pressure will cause an auto start of the Recirc MG set DC lube oil pump?
  17. What are the SCRAM Air Header valves, and are they energized or de-energized to open?
    • 2 B/U valves
    • 2 ARI valves
    • 1 ASDS valve

    All are Energize to Open
  18. What are the Lo-Lo Set valves and what are their setpoints?
    • SRV H = 1052#
    • SRV G = 1062#
    • SRV E = 1072#

    All have an 80# blowdown
  19. What Shutdown Cooling valves get open/close signals on a Group II isolation?
    • The following valves receive a close signal:
    • SDC suction isolation valves, MO-2029 and MO-2030, and the LPCI injection valve, MO-2014 or MO-2015
  20. What will be the system response if RPV pressure is 120# and an Operator takes a Shutdown Cooling suction valve (MO-2029 or MO-2030) to Open?
    No response. An RHR interlock, which prevents opening of the shutdown cooling suction valves until reactor dome pressure is 74 psig (nominal) or less, protects the suction piping from high pressure.
  21. What are the HPCI turbine trips and their setpoints? (and their resets)
    • High turbine exhaust @ 150# (90#)
    • High RPV water level @ 48" (-47")
    • Overspeed @ 5000rpm (4 to 6 sec)
    • Low suction @ 16.5" (10")
    • Group IV isolation [see other card]
  22. What are the steam inlet valves for RCIC? What trips shut what valves?
    • MO-2078: Shut on High water level
    • MO-2080: Shut on Overspeed, High exhaust, Low suction, Group V isolations
  23. What are the level setpoints for HPCI and RCIC suction swap from CST to Torus?
    • RCIC: 2'8" CST
    • HPCI: 2'8" CST or +2" Torus
  24. What is the safety backup pneumatic supply to SRVs D and G?
  25. At what pressure and flow will the RFP Aux Oil Pump start on a running RFP?
    • <6# pressure
    • <6 gpm flow
  26. The plant is in Mode 5. LC-103 xfmr is out of service. LC-103 is x-tied to LC-104. Busses 11 through 16 have normal power sources.
    What is the effect on the LPCI swing bus if a Bus 13 lockout occurs?
    • LPCI swing bus will be powered from:
    • Bus 14 -> Bus 16 -> LC-104 -> MCC-143
  27. What will the response of the EDGs be on a Loss of ALL offsite power concurrent with a loss of 125 VDC Bus A?
    • 11 EDG will start
    • 12 EDG will start and load

    Only 12 EDG will have field flash power
  28. During a refuel outage with the reactor cavity flooded and fuel pool gates removed, how low would water level get in the fuel pool if there were a leak in the reactor cavity bellows?
    Only the upper tie plates of the fuel would become uncovered
  29. The plant is operating at 74% for MSIV testing. Why is power lowered prior to closing an MSIV for testing?
    To avoid a scram due to high reactor pressure or high neutron flux
  30. What is the interlock on the Off-Gas storage tanks when attempting to take it to Release?
    A 12 hour timed interlock is set so that after taking a tank out of the Fill position, it can NOT be lined up for Release for 12 hours.
  31. Following a plant disturbance while at 100% power, the following conditions exist: HPCI Hi Diff Press alarm, Control Rods in, Steam Chase 210F, RPV level +10" and rising.
    What can be used for pressure control?
    • RCIC or Lo-Lo Set
    • HPCI will be unavailable due to Group IV.
    • Steam line will be unavailable due to Group I.
  32. What will the Recirc pumps runback to given the following initial conditions?

    Steam Flow >55.4%
    Steam Flow <50%
    Feed Flow <20%
    • >50% = Runback to 50%
    • <50% = No Runback
    • <20%FF = Runback to 30%
  33. What position(s) of the Mode switch allow a scram to be reset?
    Shutdown or Refuel only
  34. How are IRMs made to be less sensitive than SRMs?
    • Lower pressure (1.2 atm vice 14 atm)
    • Lower voltage (150 VDC vice 350 VDC)
    • Less U235 (1/5th the amount in SRMs)
  35. How are SRMs made to be more sensitive than IRMs?
    • Higher pressure (14 atm vs. 1.2 atm)
    • Higher voltage (350 VDC vs. 150 VDC)
    • More U235 (5 times more than IRMs)
  36. What is everything you know about Battery 15?
    • 24 VDC Div 1
    • D15 Dist Panel
    • Powered from L-34
    • Supplies:
    • - SRMs 21, 22
    • - IRMs 11, 12, 13, 14
    • - Flux tilt monitors
    • - OG Rad monitor trip relays
  37. What is everything you know about Battery 12?
    • 125 VDC Div 2
    • D-21 and D-211
    • Powered from MCC-143A
  38. What are the power supplies to the Service Water pumps?
    • LC-107
    • LC-104
    • LC-102
  39. What, if anything, does the RHR HX bypass do on a LPCI initiation?
    The RHR HX bypass will open to maximize LPCI injection flow
  40. What, if anything, are you required to do with Turbine loading on loss of Isophase Bus cooling?
    Must reduce load to <10,500 amps
  41. On a fast start of 11 EDG with drywell pressure >1.84#, when will the ESW pump start?
    When 11 EDG reaches 125 rpm
  42. With 8N7 Open for maintenance, and 8N11 fails, what will happen?
    Nothing. We can have one of 3 breakers in each of the 3 strings open and have no effect on the electric system
  43. How are the 345 KV breakers numbered?
    Where does 1ARS tap off?
    • 8N12 8N9 8N6
    • &nbsp;&nbsp;| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|
    • 8N11 8N8 8N5
    • &nbsp;&nbsp;| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|
    • 8N10 8N7 8N4

    1ARS taps off between 8N10 and 8N11
  44. What is the normal alignment of the OG Recombiner system during full power operation?
    Both recombiner trains operating in parallel.

    (Yes, there are two)
  45. Where is H2 injected?
    Where is O2 injected?
    H2 is injected at the RFP suction

    • O2 is injected at the Cond pump suction
    • O2 is injected at the Recombiner inlet
  46. What supplies the normal source of Main Turbine and Gland Sealing steam at full power?
    Steam leakoff from the high pressure turbine seal leakoffs and the steam admission valve leakoffs
  47. Generically, what causes a shift from 3 element feed control to 1 element?
    • Loss of feed flow signal
    • Loss of steam flow signal
  48. If in operation, what will happen to the HPCI turbine with a constant 0 gpm flow signal?
    HPCI turbine will see the 0 gpm flow signal and speed up to raise the flow (even though there IS flow), resulting in HPCI tripping on high level of 48"
  49. Regarding Torus levels, what levels are associated with the following?
    Vacuum breakers, Downcomers, HPCI exhaust, RCIC exhaust
    • Vacuum breakers: +4.2'
    • Downcomers: -3.3'
    • HPCI exhaust: -3.7'
    • RCIC exhaust: -4'
  50. Which IRMs input to RBM A? B?
    • RBM:
    • A = Odd = 11, 13, 15, 17
    • B = Even = 12, 14, 16, 18

    • RPS:
    • A = Low = 11, 12, 13, 14
    • B = High = 15, 16, 17, 18
  51. What is the RBM downscale setpoint when in Run?
    <4% with mode switch in Run
  52. What is the reason for the HPCI and RCIC steam flow Group Isolation signals?
    What are the setpoints?
    • To isolate HPCI or RCIC on a steam supply line break.
    • HPCI = 300,000 lbm/hr
    • RCIC = 44,434 lbm/hr
  53. Generically, are valves which are "Energize to Operate" powered by AC or DC?
    Valves that are "Energize to Operate" are generally DC powered
  54. If the SQUIB valve has fired and carried out its shear function, will the continuity lights be lit or out?
    The continuity lights should be out if the valves have fired and opened.
  55. Describe the interlock with the Drywell Spray valves...
    If a LPCI initiation signal is present, the Drywell Spray valves will NOT open until >1 psig in the drywell.
  56. What is the power supply to the following scram valves?
    • Backup = D11/D21
    • ARI = D11/D21
    • ASDS = D100