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Advanced Systems > PCS > Flashcards

PCS Flashcards

1
Q

LCO 3.3.8 “Alternate Shutdown System” requirement

A

The alternate shutdown system functions for PZR pressure, PZR level, PCS #1 and #2 hot leg temperature, and PCS #1 and #2 cold leg temperature shall be operable

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2
Q

LCO 3.3.8 “Alternate Shutdown System” applicability

A

Modes 1-3

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3
Q

LCO 3.3.7 “PAM Instrumentation” requirement

A

The PAM instrumentation for each PCS hot leg temperature (wide range), PCS cold leg temperature (wide range), subcooled margin monitor, PZR level (wide range), and PCS pressure (wide range) shall be operable

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4
Q

LCO 3.3.7 “PAM Instrumentation” applicability

A

Modes 1-3

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5
Q

LCO 3.4.2 “PCS Minimum Temperature for Criticality” requirement

A

Each PCS loop average temperature shall be >= 525 F

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6
Q

LCO 3.4.2 “PCS Minimum Temperature for Criticality” applicability

A
  • Mode 1

- Mode 2 with Keff >= 1.0

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7
Q

LCO 3.4.2 “PCS Minimum Temperature for Criticality” required actions if loop average temperature (Tave) in 1 or more PCS loops not within limit

A

WITHIN 30 MINUTES be in Mode 2 with Keff < 1.0

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8
Q

LCO 3.4.3 “PCS Pressure and Temperature Limits” requirement

A

PCS pressure, temperature, and heatup/cooldown rates shall be maintained within limits specified by graphs in the LCO

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9
Q

LCO 3.4.3 “PCS Pressure and Temperature Limits” applicability

A

At all times

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10
Q

LCO 3.4.3 “PCS Pressure and Temperature Limits” required actions if parameter(s) not within limits in Modes 1-4

A

WITHIN 30 MINUTES restore parameter(s) to within limits

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11
Q

LCO 3.4.3 “PCS Pressure and Temperature Limits” required actions if parameter(s) not within limits at any time other than Modes 1-4

A

IMMEDIATELY initiate action to restore parameter(s) to within limits

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12
Q

LCO 3.4.10 “Pressurizer Safety Valves” requirement

A

3 PZR safety valves shall be operable with lift settings of 2580 psia (RV-1039), 2540 psia (RV-1040), and 2500 psia (RV-1041). All pressure setpoints are +- 3%

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13
Q

LCO 3.4.10 “Pressurizer Safety Valves” applicability

A
  • Modes 1-2

- Mode 3 with all PCS cold leg temperatures >= 430 F

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14
Q

LCO 3.4.10 “Pressurizer Safety Valves” required actions if 1 PZR safety valve inoperable

A

WITHIN 15 MINUTES restore valve to operable status

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15
Q

LCO3.4.11 “Pressurizer PORVs” requirement

A

Each PORV and associated block valve shall be operable

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16
Q

LCO3.4.11 “Pressurizer PORVs” applicability

A
  • Modes 1-2

- Mode 3 with all PCS cold leg temperatures >= 430 F

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17
Q

LCO3.4.11 “Pressurizer PORVs” required actions if 1 PORV inoperable

A

WITHIN 1 HOUR close associated block valve

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18
Q

LCO3.4.11 “Pressurizer PORVs” required actions if 1 block valve inoperable

A

WITHIN 1 HOUR place associated PORV in manual control

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19
Q

LCO3.4.11 “Pressurizer PORVs” required actions if 2 PORVs inoperable

A

WITHIN 1 HOUR close associated block valves

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20
Q

LCO3.4.11 “Pressurizer PORVs” required actions if 2 block valves inoperable

A

WITHIN 1 HOUR place associated PORVs in manual control

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21
Q

LCO 3.4.13 “PCS Operational Leakage” requirement

A

PCS operational leakage shall be limited to:

  • no pressure boundary leakage
  • 1 gpm unidentified leakage
  • 10 gpm identified leakage
  • 150 gal/day primary to secondary leakage through any 1 S/G
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22
Q

LCO 3.4.13 “PCS Operational Leakage” applicability

A

Modes 1-4

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23
Q

LCO 3.4.14 “PCS Pressure Isolation Valve Leakage” requirement

A

Leakage from each PCS PIV shall be within limits and both SDC suction valve interlocks shall be operable

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24
Q

LCO 3.4.14 “PCS Pressure Isolation Valve Leakage” applicability

A
  • Modes 1-3

- Mode 4, except during the SDC mode of operation, or transition to or from, the SDC mode of operation

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25
Q

LCO 3.4.15 “PCS Leakage Detection Instrumentation” requirement

A

3 of the following PCS leakage detection instrumentation channels shall be operable:

  • 1 ctmt sump level indicating channel
  • 1 ctmt atmosphere gaseous activity monitoring channel
  • 1 CAC condensate level switch channel
  • 1 ctmt atmosphere humidity monitoring channel
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26
Q

LCO 3.4.15 “PCS Leakage Detection Instrumentation” applicability

A

Modes 1-4

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27
Q

LCO 3.4.15 “PCS Leakage Detection Instrumentation” required actions if all required channels inoperable

A

IMMEDIATELY enter LCO 3.0.3

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28
Q

LCO 3.4.16 “PCS Specific Activity” requirement

A

The specific activity of the primary coolant shall be within limits

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29
Q

LCO 3.4.16 “PCS Specific Activity” applicability

A
  • Modes 1-2

- Mode 3 with PCS average temperature >= 500 F

30
Q

LCO 3.4.17 “Steam Generator Tube Integrity” requirement

A

S/G tube integrity shall be maintained and all S/G tubes satisfying the tube repair criteria shall be plugged in accordance with the steam generator program

31
Q

LCO 3.4.17 “Steam Generator Tube Integrity” applicability

32
Q

What is the PCS design pressure

33
Q

How many gallons/percent in the PZR?

34
Q

How many PZR heaters are there?

A

120 heaters - 1500 kW

35
Q

Where are the PZR heaters powered from?

A
  • 60 from LCC-15 (Bus 1C)

- 60 from LCC-16 (Bus 1D)

36
Q

What are the PZR safety valve relief setpoints?

A

2500, 2540, 2580 psia

37
Q

Where do the PZR safety valves relieve to?

A

Quench Tank

38
Q

What are the modes of operation for the PZR PORVs?

A
  • LTOP mode

- SDC mode

39
Q

How do the PORVs operate in LTOP mode?

A

Lift and alarm setpoints vary with PZR pressure and T cold

40
Q

How do the PORVs operate in SDC mode?

A
  • Fixed lift and alarm setoints.
  • Pre-trip @ 265 psia
  • Trip @ 310 psia
41
Q

When are the PORVs aligned?

A

Aligned for automatic system pressure relief prior to 430 F

42
Q

What is the purpose/function of the PORV block valves?

A

MOVs that isolate the PORVs when temperature >430 F

43
Q

What is the “jog” feature associated with the PORV block valves?

A
  • When switch is taken to close, it has a seal in circuit, so the valve will go full closed.
  • Switch must be held in the open position to make the valve move in the open direction. As soon as the switch is released from the open position, it will spring return to neutral and the valve will stop moving, allowing you to “jog” the valve.
44
Q

What are the inputs to the Quench Tank?

A
  • PZR relief valves
  • PORVs
  • RX head vent
  • PZR vent
  • SDC relief valve
  • SIT drain relief
  • Letdown relief
45
Q

What are the Quench Tank outputs?

A
  • Drains to the PSDT

- Vents to the Containment Vent Header

46
Q

What is the Quench Tank normal operating level/temperature/pressure?

A
  • 75%
  • 104 F
  • 3-10 psig (nitrogen cover gas)
47
Q

At what pressure does the Quench Tank rupture disk blow?

48
Q

What is the function of the Quench Tank spray header?

A

Water supplied by T-90 to provide cooling and depressurization

49
Q

What are the Quench Tank high/low level alarm setpoints?

50
Q

What is the Quench Tank high pressure setpoint?

51
Q

What is the Quench Tank high temperature setpoint?

52
Q

How many hot leg RTDs do we have?

A

5 in each loop. 4 for instrumentation/indication, and 1 spare. Each one has wide range and narrow range

53
Q

What is the hot leg RTDs narrow range band?

54
Q

What do we use the hot leg RTDs narrow range for?

A
  • TMMs
  • Tave/Tref controller
  • C-12 indication
55
Q

What is the hot leg RTDs wide range band?

56
Q

What do we use the hot leg RTDs wide range for?

A
  • SMM (subcooled margin monitor)
  • PPC
  • C-02 indication
57
Q

How many cold leg RTDs do we have?

A

3 in each loop. 2 for instrumentation/indication, and 1 spare. Each one has wide range and narrow range

58
Q

What is the cold leg RTDs narrow range band?

59
Q

What do we use the cold leg RTDs narrow range for?

A
  • TMMs input
  • Tave/Tref controller input
  • C-12 indication
60
Q

What is the cold leg RTDs wide range band?

61
Q

What do we use the cold leg RTDs wide range for?

A
  • SMM (subcooled margin monitor) input
  • C-02 indication
  • PPC input
  • C-150A
  • C-33
  • LTOP input
62
Q

What is the purpose/function of the subcooled margin monitors?

A
  • Displays the margin of pressure/temperature to saturation pressure/temperature.
  • Uses highest measured temperature
63
Q

What are the power supplies for the subcooled margin monitors?

64
Q

What are the inputs to the subcooled margin monitors?

A
  • Thot (wide range)
  • Tcold (wide range)
  • PZR pressure
65
Q

What are the power supplies for the Tave/Tref controllers (TYT-0100/0200)?

66
Q

What are the inputs to the Tave/Tref controllers?

A
  • Narrow range Thot and Tcold (used to calculate Tave and delta T)
  • Turbine 1st stage pressure (used to calculate Tref)
67
Q

What is output from the Tave/Tref controllers?

A
  • Tave
  • Tave selector switch selects which loops Tave is displayed.
  • Tave signal is sent out to PPC, opposite controller for Tave deviation alarm, PZR level control, digital display, and steam dump controller.
    - Delta T
  • Signal is sent to Loop 1 and Loop 2 delta T indication, PPC PIP, and PPC SPI.
    - Tref
  • Signal is sent to Loop 1 and Loop 2 Tref indication
68
Q

S/G D/P indication/instrumentation purpose/function?

A

Shows loop flow status by measuring D/P between the hot leg just before the S/G and each PCP suction leg.

69
Q

What is indicated by the S/G D/P indicators?

A
  • Each loop has 4 channels (4 detectors in each hot leg, and 2 in each PCP suction leg)
  • Each channel is indication of total flow
  • If 1 PCP trips, all 4 channels will lower by approximately 25%
  • If 2/4 channels indicate flow is less than setpoint, then the RX is tripped
70
Q

What are the ORM requirements for PCS heatup/cooldown rates?

A
  • Cooldown <= 200 F/hr
  • Heatup <= 100 F/hr
  • Heatup when SDC isolation valves are open <= 60 F/hr
  • If these requirements aren’t met, then restore to within limits WITHIN 30 MINUTES

Advanced Systems (36 decks)

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