PCS

Card Set Information

Author:
skrappie1
ID:
112661
Filename:
PCS
Updated:
2015-11-10 16:03:54
Tags:
PCS advanced systems
Folders:

Description:
PCS
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user skrappie1 on FreezingBlue Flashcards. What would you like to do?


  1. How much spray flow with one spray valve isolated?
    PZR spray flow is reduced to approximately 70% of maximum flow.
  2. How much is spray flow reduced when operating with only 1 PCP per loop?
    Spray is reduced to only 40% spray flow.
  3. How much is spray flow reduced when only 1 PCP in each loop and 1 spray valve is isolated?
    PZR spray flow is reduced to approximately 30% of maximum flow.
  4. 3.4.14 PCS Pressure Isolation Valve (PIV) Leakage
    LCO 3.4.14 Leakage from each PCS PIV shall be within limits and both Shutdown Cooling (SDC) suction valve interlocks shall be OPERABLE.

    • APP: MODES 1, 2, and 3,
    • MODE 4, except during the SDC mode of operation, or transition to or from, the SDC mode of operation.

    • NOTES:
    • 1. Separate Condition entry is allowed for each flow path.
    • 2. Enter applicable Conditions and required Actions for systems made inoperable by an inoperable PIV.

    NO </= 1 HOUR ACTIONS
  5. What is the refueling boron concentration?
    Primary coolant system concentration of >/= 1720 ppm boron and sufficient to assure the reactor is subcritical by >/= 5% reactivity with all control rods withdrawn
  6. 3.4.2 PCS Minimum Temperature for Criticality
    LCO 3.4.2 Each PCS loop average temperature (Tave) shall be ≥ 525°F.

    • APP: MODE 1
    • MODE 2 with Keff ≥ 1.0.

    • ACTIONS
    • A. Tave in one or more PCS loops not within limit.
    • -A.1 Be in MODE 2 with Keff < 1.0.-30 minutes.
  7. What are the plant heatup and cooldown limits?
    • Tc </= 170oF
    • -H/U 20oF/hr
    • -C/D 40oF/hr

    • Tc >/=170F</=250F
    • -H/U 40F/hr
    • -C/D 40F/hr
    • Tc >250F<350F
    • -H/U 60F/hr
    • --when SDC valves MO-3015 and MO-3016 are open max H/U </=40F/hr
    • -C/D 60F/hr
    • Tc >/=350F
    • -H/U 100F/hr
    • -C/D 100F/hr

    Additional restrictions: maintain average core exit temperature 135F >/= T >/= 110F for >/= 3 hours, then maintain average C/D limit of 20F/hr based on CET indication
  8. What is needed to arm the PORVs?
    • Block valves
    • PORV handswitch is in enable
    • Will get a white light at the handswitch
  9. What is the differential boron concentration limit between the PCS and pressurizer?
    • Differential boron concentration should not exceed 50 ppm
    • -minimizes any unexpected reactivity changes associated with changing plant modes
  10. What is the PORV block valves (MO-1042A, MO-1043A) jog feature?
    • Seals in on close
    • Valve only moves when the switch is held in the open direction
    • -this prevents inadvertent opening of the PORVs and allows the PORVs pilot chamber pressure to slowly equalize
  11. What are the LTOP power supplies?
    • PY-0105A
    • -Y-30
    • PY-0105B
    • -Y-40
  12. Why do we not use the PORVs as a vent path when pressurizer level is >95%?
    Prevents filling the PORV line with water.
  13. What are the modes of operation for the PORVs (PRV-1042B,1043B)?
    • 2 modes of operation
    • -LTOP
    • --PRV setpoint and alarm setpoints are variable based on system pressure and cold leg temperature
    • -SDC
    • --fixed setpoint for relief and alarm
    • ---pretrip-265 psia-alarm
    • ---trip-310 psia-valve opens
    • 2 solenoid pilot-actuated PORVs provide PCS over-pressure protection during periods of low temperature or water solid system operation
    • -2 block valves (MO-1042A, MO-1043A)
    • Placed in service at 430oF lowering
  14. PZR relief valve discharge temperatures
    • TE-0106 on the common PORV discharge line
    • TE-0107-0109 on each safety valve discharge header
    • Indications on C-12
    • Alarms at 180oF
  15. What are the pretrip alarm and lift setpoints for LTOP?
    • When in variable mode
    • -pretrip is 50 psia less than the calculated trip
    • When on SDC
    • -pretrip alarm is at 265 psia
    • -PORVs open at 310 psia
  16. LCO 3.4.11 Pressurizer Power Operated Relief Valves (PORVs)
    LCO 3.4.11 Each PORV and associated block valve shall be OPERABLE.

    • APPLICABILITY: MODES 1 and 2,
    • MODE 3 with all PCS cold leg temperatures ≥ 430°F.

    NOTE-Seperate Condition entry is allowed for each PORV.

    • Actions:
    • A. One PORV inoperable.
    • -A.1 Close associated block valve. 1 hour
    • B. One block valve inoperable.
    • -B.1 Place associated PORV in manual control. 1 hour
    • C. Two PORVs inoperable.
    • -C.1 Close associated block valves. 1 hour
    • D. Two block valves inoperable.
    • -D.1 Place associated PORVs in manual control. 1 hour
  17. LCO 3.4.9 Pressurizer
    • LCO 3.4.9 The pressurizer shall be OPERABLE with:
    • a. Pressurizer water level < 62.8%;
    • -----------------NOTE-----------------------
    • The pressurizer water level limit does not apply in MODE 3 until after a bubble has been established in the pressurizer and the pressurizer water level has been lowered to within its normal operating band.
    • b. ≥ 375 kW of pressurizer heater capacity available from electrical bus 1D, and
    • c. ≥ 375 kW of pressurizer heater capacity available from electrical bus 1E with the capability of being powered from an emergency power supply.
    • APPLICABILITY: MODES 1, 2, and 3.
    • Actions:
    • NO LESS </= 1 HOUR ACTIONS
  18. What do you have to do if a delta T between the spray water and the pressurizer vapor space is greater than 200oF?
    • Log delta T, and pressurizer pressure
    • Log the cumulative total of spray cycles in the NCO shift turnover binder
    • -this is necessary to preserve the fatigue usage factor limits for the spray line and nozzle
  19. LCO 3.4.12 Low Temperature Overpressure Protection (LTOP) System
    • LCO 3.4.12 An LTOP System shall be OPERABLE with:
    • a. Both High Pressure Safety Injection (HPSI) pumps incapable of injecting into the PCS, and
    • -----------NOTES---------------------
    • 1. LCO 3.4.12.a is only required when any PCS cold leg temperature is < 300°F.
    • 2. LCO 3.4.12.a does not prohibit the use of the HPSI pumps for emergency addition of makeup to the PCS.
    • b. One of the following pressure relief capabilities:
    • 1. Two Power Operated Relief Valves (PORVs) with lift settings as specified in Figure 3.4.12-1; or
    • 2. The PCS depressurized and a PCS vent capable of relieving ≥ 167 gpm at a pressure of 315 psia.
    • APPLICABILITY: MODE 3 when any PCS cold leg temperature < 430°F,
    • MODES 4 and 5,
    • MODE 6 when the reactor vessel head is on.
    • Actions
    • ------------------NOTE----------------------
    • LCO 3.0.4.b is not applicable to PORVs when entering MODE 4.
    • A. One or two HPSI pumps capable of injecting into the PCS.
    • -
    • A.1 Initiate action to verify no HPSI pump is capable of injecting into
    • the PCS. IMMEDIATELY
  20. LCO 3.4.10 Pressurizer Safety Valves
    • LCO 3.4.10 Three pressurizer safety valves shall be OPERABLE with lift settings as specified in Table 3.4.10-1.
    • APPLICABILITY: MODES 1 and 2,
    • MODE 3 with all PCS cold leg temperatures ≥ 430°F.
    • Actions
    • A. One pressurizer safety valve inoperable.
    • -A.1 Restore valve to OPERABLE status. 15 minutes
  21. Pressurizer
    • Maintains PCS operating pressure and compensates for changes in the PCS volume during load changes
    • 1500ft3 (800ft3 water at full power)
    • 66 gallons/%
  22. What causes the PORVs to open?
    • LTOP
    • Handswitch to open
    • When in auto, pressurizer pressure of 2235 psia
  23. Pressurizer surge line temperature
    • Uses WR RTD (0-700oF)
    • Indicates on C-12
    • EK-0739 "PZR surge line lo temp"
    • -450F
  24. What is the LTOP function and how does it operate?
    • Provides overpressure protection when less than 430oF.
    • LTOP control unit calculates a pressure setpoint based on Tc
    • Actuates the PORVs if calculated pressure setpoint is exceeded
  25. What are the inputs to LTOP?
    • Pressure
    • -Pressurizer narrow range
    • --initiates opening of the PORVs
    • -Pressurizer wide range
    • --redundant pressure channel inputs
    • 2 Tc inputs
  26. What are the power supplies and design parameters for PORVs and block valves?
    • PRV-1043B
    • -D-21-1
    • PRV-1042B
    • -D-11-1
    • MO-1042A
    • -MCC-25
    • MO-1043A
    • -MCC-26
    • Design temperature of 700oF
    • Capacity
    • -514,800 lbm/hr saturated steam
    • -893,520 lbm/hr saturated water
  27. Pressurizer spray line temperature
    • Uses WR RTD (0-700oF)
    • "PZR spray line 1B(2A) lo temp"
    • -450oF
    • --indicates that continuous spray rate has decreased
  28. LCO 3.4.1 PCS Pressure, Temperature, and Flow Departure from Nucleate Boiling (DNB) Limits
    LCO 3.4.1 PCS DNB parameters for pressurizer pressure, cold leg temperature, and PCS total flow rate shall be within the limits specified in the COLR.

    APPLICABILITY: MODE 1.

    NO </= 1 HOUR ACTIONS
  29. What are the quench tank level setpoints?
    • Alarm EK-0733 "Quench tank HI/LO level"
    • -79% high level
    • -67% low level
  30. LCO 3.4.5 PCS Loops - MODE 3
    LCO 3.4.5 Two PCS loops shall be OPERABLE and one PCS loop shall be in operation.

    -----------------NOTES---------------------

    • 1. All primary coolant pumps may not be in operation for ≤ 1 hour per 8 hour period, provided:
    • a. No operations are permitted that would cause reduction of the PCS boron concentration; and
    • b. Core outlet temperature is maintained at least 10°F below saturation temperature.
    • 2. Forced circulation (starting the first primary coolant pump) shall not be initiated unless one of the following conditions is met:
    • a. PCS cold leg temperature (Tc) is > 430°F;
    • b. Steam Generator (SG) secondary temperature is equal to or less than the reactor inlet temperature (Tc);
    • c. SG secondary temperature is < 100°F above Tc, and shutdown cooling is isolated from the PCS, and PCS heatup/cooldown rate is ≤10°F/hour; or
    • d. SG secondary temperature is < 100°F above Tc, and shutdown cooling is isolated from the PCS, and pressurizer level is ≤57%.

    • APPLICABILITY: MODE 3.
    • Actions:
    • C. No PCS loop OPERABLE.
    • OR
    • No PCS loop in operation.
    • -C.1 Suspend all operations involving a reduction of PCS boron concentration. IMMEDIATELY
    • AND
    • -C.2 Initiate action to restore one PCS loop to OPERABLE status and operation. IMMEDIATELY
  31. LCO 3.4.15 PCS Leakage Detection Instrumentation
    • LCO 3.4.15 Three of the following PCS leakage detection instrumentation channels shall be OPERABLE:
    • a. One containment sump level indicating channel;
    • b. One containment atmosphere gaseous activity monitoring channel;
    • c. One containment air cooler condensate level switch channel;
    • d. One containment atmosphere humidity monitoring channel.

    APPLICABILITY: MODES 1, 2, 3, and 4.

    • Actions:
    • C. All required channels inoperable.
    • -C.1 Enter LCO 3.0.3. IMMEDIATELY
  32. LCO 3.4.7 PCS Loops - MODE 5, Loops Filled
    • LCO 3.4.7 One Shutdown Cooling (SDC) train shall be OPERABLE and in operation with ≥ 2810 gpm flow through the reactor core, and either:
    • a. One additional SDC train shall be OPERABLE; or
    • b. The secondary side water level of each Steam Generator (SG) shall be ≥ -84%.
    • ----------------NOTES----------------------

    • 1. The SDC pump of the train in operation may not be in operation for ≤ 1 hour per 8 hour period provided:
    • a. No operations are permitted that would cause reduction of the PCS boron concentration; and
    • b. Core outlet temperature is maintained at least 10°F below saturation temperature.
    • 2. Both SDC trains may be inoperable for up to 2 hours for surveillance testing or maintenance provided:
    • a. One SDC train is providing the required flow through the reactor core;
    • b. Core outlet temperature is maintained at least 10°F below saturation temperature; and
    • c. Each SG secondary side water level is ≥-84%.
    • 3. Forced circulation (starting the first primary coolant pump) shall not be initiated unless one of the following conditions is met:
    • a. SG secondary temperature is equal to or less than the reactor inlet temperature (Tc);
    • b. SG secondary temperature is < 100°F above Tc, and shutdown cooling is isolated from the PCS, and PCS heatup/cooldown rate is ≤10°F/hour; or c. SG secondary temperature is < 100°F above Tc, and shutdown cooling is isolated from the PCS, and pressurizer level is ≤57%.
    • 4. Primary coolant pumps P-50A and P-50B shall not be operated simultaneously.
    • 5. All SDC trains may not be in operation during planned heatup to MODE 4 when at least one PCS loop is in operation.
    • ----------------------------------------------
    • APPLICABILITY: MODE 5 with PCS loops filled.

    • Actions:
    • A. One SDC train inoperable. AND Any SG with secondary side water level not within limit.
    • -A.1 Initiate action to restore a second SDC train to OPERABLE status. IMMEDIATELY
    • OR
    • -A.2 Initiate action to restore SG secondary side water levels to within limits. IMMEDIATELY
    • B. Two SDC trains inoperable.
    • OR
    • SDC flow through the reactor core not within limits.
    • -B.1 Suspend all operations involving reduction in PCS boron concentration. IMMEDIATELY
    • AND
    • -B.2 Initiate action to restore one SDC train to OPERABLE status and operation with ≥ 2810 gpm flow through the reactor core. IMMEDIATELY
  33. LCO 3.4.8 PCS Loops - MODE 5, Loops Not Filled
    • LCO 3.4.8 Two Shutdown Cooling (SDC) trains shall be OPERABLE, and either:
    • a. One SDC train in operation with ≥ 2810 gpm flow through the reactor core; or

    • b. One SDC train in operation with ≥ 650 gpm flow through the reactor core with two of the three charging pumps incapable of reducing the boron concentration in the PCS below the minimum value necessary to maintain the required SHUTDOWN MARGIN.
    • ---------------NOTES-----------------------

    • 1. All SDC pumps may not be in operation for ≤ 1 hour provided:
    • a. No operations are permitted that would cause a reduction of the PCS boron concentration;
    • b. Core outlet temperature is maintained > 10°F below saturation temperature; and
    • c. No draining operations to further reduce the PCS water volume are permitted.
    • 2. One SDC train may be inoperable for ≤2 hours for surveillance testing provided the other SDC train is OPERABLE and in operation.

    APPLICABILITY: MODE 5 with PCS loops not filled.

    • Actions:
    • A. One SDC train inoperable.
    • -A.1 Initiate action to restore SDC train to OPERABLE status. IMMEDIATELY
    • B. Two SDC trains inoperable.
    • OR
    • SDC flow through the reactor core not within limits.
    • -B.1 Suspend all operations involving reduction of PCS boron concentration. IMMEDIATELY
    • AND
    • -B.2 Initiate action to restore one SDC train to OPERABLE status and operation with SDC flow through the reactor core within limit. IMMEDIATELY
  34. LCO 3.4.6 PCS Loops - MODE 4
    • LCO 3.4.6 Two loops or trains consisting of any combination of PCS loops and Shutdown Cooling (SDC) trains shall be OPERABLE, and either:
    • a. One PCS loop shall be in operation; or
    • b. One SDC train shall be in operation with ≥ 2810 gpm flow through the reactor core.

    ------------------NOTES--------------------

    • 1. All Primary Coolant Pumps (PCPs) and SDC pumps may not be in operation for ≤ 1 hour per 8 hour period, provided:
    • a. No operations are permitted that would cause reduction of the PCS boron concentration; and
    • b. Core outlet temperature is maintained at least 10°F below saturation temperature.
    • 2. Forced circulation (starting the first PCP) shall not be initiated unless one of the following conditions is met:
    • a. Steam Generator (SG) secondary temperature is equal to or less than the reactor inlet temperature (Tc),
    • b. SG secondary temperature is < 100°F above Tc, and shutdown cooling is isolated from the PCS, and PCS heatup/cooldown rate is ≤10°F/hour,
    • c. SG secondary temperature is < 100°F above Tc, and shutdown cooling is isolated from the PCS, and pressurizer level is ≤57%.
    • 3. Primary coolant pumps P-50A and P-50B shall not be operated simultaneously.

    APPLICABILITY: MODE 4.

    • ACTIONS:
    • A. One PCS loop inoperable.
    • AND
    • Two SDC trains inoperable.
    • -A.1 Initiate action to restore a second PCS loop or one SDC train to OPERABLE status. IMMEDIATELY
    • C. No PCS loops or SDC trains OPERABLE.
    • OR
    • No PCS loop in operation with SDC flow through the reactor core not within limits.
    • -C.1 Suspend all operations involving reduction of PCS boron concentration. IMMEDIATELY
    • AND
    • -C.2.1 Initiate action to restore one PCS loop to OPERABLE status and operation. IMMEDIATELY
    • ----------OR
    • -C.2.2 Initiate action to restore one SDC train to OPERABLE status and operation with ≥ 2810 gpm flow through the reactor core. IMMEDIATELY
  35. LCO 3.4.16 PCS Specific Activity
    LCO 3.4.16 The specific activity of the primary coolant shall be within limits.

    • APPLICABILITY: MODES 1 and 2,
    • MODE 3 with PCS average temperature (Tave) ≥ 500°F.

    NO </= 1 HOUR ACTIONS
  36. LCO 3.4.3 PCS Pressure and Temperature (P/T) Limits
    • LCO 3.4.3 PCS pressure, PCS temperature, and PCS heatup and cooldown rates shall be maintained within the limits of Figure 3.4.3-1 and Figure 3.4.3-2.
    • APPLICABILITY: At all times.
    • ACTIONS:
    • A. -------------NOTE--------------
    • Required Action A.2 shall be completed whenever this Condition is entered.
    • -----------------------------------
    • Requirements of LCO not met in MODE 1, 2, 3, or 4.
    • -A.1 Restore parameter(s) to within limits. 30 minutes
    • C. --------------NOTE-------------
    • Required Action C.2 shall be completed whenever this Condition is entered.
    • -----------------------------------
    • Requirements of LCO not met any time in other than MODE 1, 2, 3, or 4.
    • -C.1 Initiate action to restore parameter(s) to within limits. IMMEDIATELY
  37. LCO 3.3.7 Post Accident Monitoring (PAM) Instrumentation
    LCO 3.3.7 The PAM instrumentation for each Function in Table 3.3.7-1 shall be OPERABLE.

    APPLICABILITY: MODES 1, 2, and 3.

    • -------------NOTE---------------------------
    • Separate Condition entry is allowed for each Function.

    • Actions:
    • MUST LOOK AT TABLE FOR ACTIONS
  38. What are the inputs to the quench tank?
    • PZR PORVs
    • Reactor head vents
    • Pressurizer vents
    • Shutdown cooling relief valve discharge
    • SIT drain reliefs
    • Letdown line relief
    • Pressurizer safety valves
  39. LCO 3.4.13 PCS Operational LEAKAGE
    • LCO 3.4.13 PCS operational LEAKAGE shall be limited to:
    • a. No pressure boundary LEAKAGE;
    • b. 1 gpm unidentified LEAKAGE;
    • c. 10 gpm identified LEAKAGE; and
    • d. 150 gallons per day primary to secondary LEAKAGE through any
    • one steam generator (SG).

    APPLICABILITY: MODES 1, 2, 3, and 4.

    • ACTIONS:
    • NO </= 1 HOUR ACTIONS
  40. LCO 3.4.4 PCS Loops - MODES 1 and 2
    LCO 3.4.4 Two PCS loops shall be OPERABLE and in operation.

    APPLICABILITY: MODES 1 and 2.

    NO </= 1 HOUR ACTIONS
  41. What are the inputs to the subcooled margin monitors?
    • SM-0114
    • -loop 1 Th
    • -loop 1A Tc
    • -loop 1B tc
    • -pressurizer pressure

    • SM-0124
    • -loop 2 Th
    • -loop 2A Tc
    • -loop 2B Tc
    • -pressurizer pressure
  42. What are the inputs to the Tave/Tref controllers (TYT-0100/0200)?
    • Narrow range Th and Tc (515-615oF)
    • Turbine first stage pressure
  43. What actions are required to mitigate the consequences of voiding in the PCS?
    • If PCS pressure reduction or PCS heat removal is inhibited, then void elimination actions should take place.
    • Shift supervisor can direct void elimination
    • EOP supplement 26 contains void elimination actions
    • Actions to mitigate voids consist mostly of removing condensible voids, since those are the most likely to be affecting a safey function
    • Note that the primary coolant gas vent system is only used for non condensible void removal
  44. What is the primary to secondary differential pressure limit?
    • Differential pressure should be less than 1380 psid
    • -this ensures S/G tube integrity.
  45. What is the subcooled margin monitors (SMM-0114/0124) alarm setpoint?
    • EK-1120 "Low Subcooling Margin" alarms at < 25oF subcooling
    • -if the display is flashing, then the monitor is inoperable
  46. What is the high temperature setpoint for the quench tank?
    • EK-0731 "Quench Tank High Temp"
    • -150oF
  47. What is UNIDENTIFIED LEAKAGE?
    All leakage that is not identified leakage.
  48. What is PRESSURE BOUNDARY LEAKAGE?
    Leakage (except primary to secondary leakage) through a non-isolable fault in a PCS component body, pipe wall, or vessel wall.
  49. What is the purpose/design of the quench tank?
    • Recieves and condenses the normal discharges from the pressurizer safety and relief valves, and prevents the discharge from being released to the containment atmosphere.
    • Drained to the PSDT
    • Vents to the containment vent header
    • Designed for 100 psig, 340oF
    • NOP 3 psig, NOT 104oF, NOL 75%
    • Sufficient water to condense the total steam mass released during a 112% to 0% reactor power swing
  50. What are the outputs of the Tave/Tref controllers (TYT-0100/0200)?
    • Tave
    • -TR-0100 on C-02
    • -PIP node on the PPC
    • -SPI node on the PPC
    • -if the average temperature display selector switch on C-02 is placed in Loop 1(2) then loop 1(2) Tave is sent to:
    • --TI-0110 Tave digital indication on C-02
    • --HIC-0780A-steam dump controller
    • --LIC-0101A/B-PZR level control system
    • Tave from TYT-0200 is sent to TYT-0100 where there is a deviation alarm if the Taves differ by >/= 5oF
    • Outputs a Tave/Tref deviation alarm
    • Outputs a Tref signal
  51. What is IDENTIFIED LEAKAGE?
    • Leakage such as that from pump seals or valve packing that is captured and conducted to collection systems or a sump or collecting tank
    • Leakage into the containment atmosphere from sources that are both specifically located and known not to interfere with operation of leakage detection systems and not to be pressure boundary leakage
    • PCS leakage through a S/G to secondary system
  52. What is the pressure limit of the quench tank?
    • < 10 psig
    • -this is the maximum value that is used in the design for a release from the pressurizer safety valves to the quench tank as a result of a reactor power swing from 0% to 112% without primary coolant letdown or pressurizer spray.
    • Actuates EK-0732 "Quench Tank High Pressure" at 10 psig.
  53. What are the power supplies for the subcooled margin monitors (SMM-0114/0124)?
    • SMM-0114
    • -Y-30
    • SMM-0124
    • -Y-40
  54. What are the backup methods to determine subcooling?
    • Pressurizer temperature and Th/CET
    • Steam tables
    • PPC readout of subcooling margin
    • 25oF subcooling curve in EOP supplement 1
  55. What is the purpose of the quench tank rupture disc (RUD-0162)?
    • Sized to pass the greatest anticipated discharge, which occurs during a loss of load incident without a reactor trip
    • Setpoint of 100 psig
  56. What are the outputs from the subcooled margin monitors?
    • Temperature margin to saturation temperature
    • Pressure margin to saturation pressure
  57. What are the indications of PCS voiding?
    • Indicated charging and letdown flows do not correspond to pressurizer level trend
    • Pressurizer level is rising significantly faster than the trend expected for aux spray flow
    • Core differential temperature (average of the qualified CETs-Tc) or loop differential temperature (Th-Tc) rising for the same secondary steaming and aux feed rates.
    • Any operable PCS temperature indication is less than 25oF subcooled
    • Operable RVLMS indicates voiding in the reactor vessel
  58. ORM 4.2 Equipment testing requirements-primary coolant gas vent system
    • Spec:
    • Each primary coolant gas vent from the reactor vessel and the pressurizer shall be demonstrated operable once, for each refueling cycle by:
    • -verify all manual isolation valves in each vent path are locked open
    • -cycling each valve in the vent path through at least one complete cycle of full travel from the control room during modes 5 or 6
    • -verify flow through the reactor coolant vent system paths during modes 5 or 6
  59. ORM 3.1.10 Primary coolant gas vent system
    • Spec:
    • The following primary coolant vent system paths consisting of at least 2 valves in series shall be operable and closed
    • -reactor vessel vent path to containment and reactor vessel vent path to the quench tank
    • -pressurizer vent path to containment and pressurizer vent path to the quench tank

    • APP: Modes 1 and 2
    • Mode 3 with PCS temperature > 525oF
  60. What is the purpose of the primary coolant gas vent system?
    Designed to vent steam or noncondensible gases from the reactor vessel head and pressurizer under post accident conditions
  61. Why do we change the cooldown rate to the new lower rate 1 hour prior to reaching the new required rate, i.e. before 290F reduce to 40F/hr?
    Ensures LTOP design assumptions are met such that an increase in PCS pressure due to PCS H/U will not exceed LTOP capacity.

    Ensures thermal stresses on the Reactor Vessel and PCS piping are minimized.
  62. What must you have to consider the SDC suction valve interlocks OPERABLE?
    2 channels of pressurizer narrow range pressure instruments must be capable of providing an open inhibit signal to their respective isolation valve.
  63. What are the limits specified in the COLR for pressurizer pressure, cold leg temperature and PCS total flowrate?
    • PCS pressure
    • -2010-2100
    • Tc
    • -</= 544F
    • PCS flow
    • ->/= 352,000 gpm
  64. What are the acceptable vent paths for LCO 3.4.12 LTOP system?
    Removal of a steam generator primary manway

    Removal of the pressurizer manway

    Removal of a PORV or pressurizer safety valve

    Both PORVs and associated block valves open

    Opening of both PCS vent valves MV-PC514 and MV-PC515

What would you like to do?

Home > Flashcards > Print Preview