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RO34 - Revised and Upgraded Decks > CVCS > Flashcards

CVCS Flashcards

1
Q

What are the CCP auto Starts?

A

SI

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2
Q

What are the CCP Trips?

A
  • Loadshed - Train Specific
  • Overcurrent/Overload
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3
Q

What are the VCT Lvl auto actions?

A
  • 87% Full Divert to CVCSHUT (QLC-451/452)
  • 78% Divert starts to Open (QLC-452)
  • 24% Stops auto Makeup (QLC-451)
  • 14% Starts auto Makeup (QLC-451) (alarms)
  • 7% Low Lvl Alarm (QLC-452)
  • 2.5% RWS (QLC-451 AND 452)
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4
Q

What does QRV-301 (LD Pressure Ctrl Valve) do and how does it fail?

A
  • Maintains backpressure on the LD orifices to keep the water from flashing to steam
  • Fails open
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5
Q

What does QRV-302 (Demin Divert Valve) do and how does it fail?

A
  • Diverts LD flow from demins to RC Filter if temperature is > 143°F
  • Fails to RC filter (Divert)
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6
Q

What does QRV-251 (CCP disch flow ctrl valve) do and how does it fail?

A
  • Ctrls CCP flow and is used to maintain Pzr Lvl
  • Fails open
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7
Q

What does QRV-200 (CCP header pressure ctrl valve) do and how does it fail?

A
  • Used to maintain required flow to RCP seals (~32 gpm)
  • Fails close
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8
Q

What does QLC-451 control for the VCT?

A
  • Half of Refueling Water Sequence
  • Starts Make up at 14% and Stops at 24%
  • Trips open divert at 87%
  • Gives High, Low and Low Low Alarms
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9
Q

What does QLC-452 control for the VCT?

A
  • Half of Refueling Water Sequence
  • Starts Divert at 78% with FULL Divert at 87%
  • Low and Low Low Alarm
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10
Q

What does QRV-303 (Inlet Valve to VCT) do and how does it fail?

A
  • Diverts LD to CVCS HUTs if VCT level is too high
  • Fails flow to VCT
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11
Q

What will happen when Pressurizer level reaches 17% level?

A

Letdown Isolates
- QRV-160/161/162 (LD orifice isolations) Close
- QRV-111/112 (LD isolation valves) Close

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12
Q

When do QRV-160/161/162 (LD orifice isolations) auto close and how do they fail?

A
  • Phase A
  • When either letdown isolation (QRV-111/112) is closed.
  • Both CCP breakers open
  • 17% Pzr Lvl
  • Fail Closed
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13
Q

What interlock is associated with QRV-111/112 (LD iso valves)?

A

Will not open if ANY LD Orifice Isolation (QRV-160/161/162) is open

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14
Q

What happens on an SI in the CVCS System?

A
  • Both CCP auto start
  • Realigns suction of CCPs to RWST
  • Suction from VCT Isolates
  • BIT Valves OPEN
  • Charging Header Isolation valves (to Regen Hx) CLOSE
  • CCP ELOs CLOSE and then cycle based on pressure (1812-1825#)
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15
Q

What happens on an Phase A in the CVCS System?

A
  • LD Orifice Valves (QRV-160/161/162) CLOSE
  • LD Containment Isolation Valves (QCR-300 and QCR-301) CLOSE
  • RCP Seal Reture Valves (QCM-250 and QCM-350) CLOSE
  • CCW to Excess Letdown HX Closes
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16
Q

What causes a Refueling Water Sequence in the CVCS System?

A

2.5% level in VCT from BOTH QLC-451 and 452

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17
Q

What are the CCP recirc valves (QMO-225/226) controlled by and how does it work?

A
  • Pressurize Pressure Instruments NPP-151/153
  • Valves will cycle 2 sec after a SI signal is received and maintain 1812-1825#
  • Valves will cycle until SI is reset and the switch is taken to Pull-to-Stop
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18
Q

Why might an Operator choose to close the CCP ELOs?

A

To reduce time for boron to reach RCS

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19
Q

Where can seal water return discharge to?

A

Top of VCT or CCP Suction downstream of VCT outlets

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20
Q

What are the VCT pressure limits and basis?

A
  • Min = 15 psig during RCP operations (for RCP seal #2 flow)
  • Max = 37 psig (ensures adequate Emergency Boration Flow)
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21
Q

Why is there a Hydrogen blanket on the VCT?

A

To minimize oxygen in the RCS

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22
Q

What happens if level channel QLC-452 fails HIGH? ASSUME no operator action is taken.

A

Actual VCT level decrease with potential charging pump damage

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23
Q

A safety injection has occured. SI has been reset. Now, a Loadshed occurs. Will the Charging Pump automatically restart after the EDG Starts?

A

No! The loadshed has tripped the running CCP. With SI reset, there is not a standing start signal. It has to be manually started.

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24
Q

If there is a Refueling Water Sequence, but only ONE of the charging pump suction valves from the RWST opened (the other FAILED), where are the CCPs receiving suction from?

A

Both operating charging pumps will receive suction flow from the RWST.

Only need 1 valve to open

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25
Q

Following the closure of Reactor Coolant Pump seal water return isolation valves, QCM-250 and -350, seal return flow will:

A

Flow through a relief valve to the PRT. (SV-50)

26
Q

Why do we maintain RCP seal injection flow resistance?

A

If the resistance is too small, ECCS injection flow may be less than required for core cooling during a LOCA.

27
Q

If QLC-452 fails high with 120 gpm letdown in service and blender controls in automatic (assume NO operator action), the actual VCT level will eventually….

A

Lower to zero and result in loss of CCP suction.

RWS will NOT happen because you need 2/2

28
Q

When Emergency Boration is started by opening the emergency boration valve, QMO-410, the boric acid transfer pump …

A

Must be shifted to fast speed by the operator to inject boron at a correct rate.

29
Q

If either QRV-111/112 go closed, what will happen automatically?

A

QRV-160/161/162 will close due to the interlock

30
Q

How many gallons per percent is the VCT?

A

19 gal / 1%

31
Q

What has to happen first before QMO-451/452 will go closed?

A

IMO-910 OR IMO-911 (1/2) must be full open before QMO-451/452 will go closed

32
Q

If QRV-412 (PW to blender) is in auto, how much primary water flow is available? If its in manual?

A
  • 70 gpm (Auto)
  • Adjustable (Manual)
33
Q

If QLC-451 fails high, what will happen?

A
  • Hi Lvl Alarm in VCT
  • Trips QRV-303 to full divert
34
Q

If QLC-451 fails Low, what will happen?

A
  • Auto Make-up will start
  • Low and low low Lvl Alarms
35
Q

If QLC-452 fails high, what will happen?

A

Modulates QRV-303 to full open
NO ALARM IS GIVEN!

36
Q

If QLC-452 fails Low, what will happen?

A

Low and low low lvl alarm will come in

37
Q

What could the cause be of flashing in the Letdown Line?

A

Charging flow too low or QRV-301 (LD Pressure Ctrl Valve) too far open

38
Q

When the Mode Selector is in Alt Dilute, an Operators have not taken action to manually close any valves, what happens?

A
  • PW to Blender QRV-412/422 Throttles
  • Blender to VCT QRV-451 Opens
  • CCP Suction QRV-400 Opens
  • PW Pumps Start
39
Q

When in AUTO, what is the minimum output of QRV-251 (CCP disch flow ctrl valve)? Why?

A

23.5% (47gpm) while in auto. (protect RCP seals)

40
Q

Where does LD Safety (SV-51) discharge to?

A

PRT

41
Q

What happens to the CVCS if a Refueling Water Sequence if received?

A
  • CCP suction from RWST Opens
  • When one of the suction valves from RWST is open, VCT outlet valves close
42
Q

If in Mode 3-5 and SDM is not within the COLR Limits, what must be done per Tech Spec 3.1.1, Shutdown Margin?

A

Borate to restore within 15 minutes

43
Q

Why must the Seal Return Isolation valve QCM-350 be closed within 15 minutes of a Loss of all AC Power?

A

To prevent steam binding in the CCP

44
Q

What will an Operator need to do if the running CCP trips on overload?

A

Manually start the standby CCP and realign letdown bc LD Orifice Isolation valves closed.

45
Q

How does QRV-171 (EXCESS LETDOWN HX OUTLET DIVERSION VALVE) fail in each unit?

A

Unit 1 is to the seal return Line
Unit 2 to the RCDT

46
Q

If there is a leak in the RCS and the Regen Hx Outlet temp is lowering with Charging Flow rising, where is the leak likely to be located?

A

RCS leakage is from the charging line on the RCS side of the regenerative heat exchanger

47
Q

If QRV-200, RCP Seal Backpressure Valve fails to a more open position, how are Seal Injection, Charging to the Regen and Discharge Pressure of the CCP affected?

A

Seal Injection Lowers
Charging Flow Rises
Pump Discharge Pressure Lowers

48
Q

If there is a leak in the RCS and the Regen Hx Outlet temp is rising with Charging Flow rising, where is the leak likely to be located?

A

Charging line between the flow indicator and Containment.

49
Q

If there is leakage outside of containment, which Tech Spec should be used for monitoring leakage?

A

TS 5.5.2, Leakage Monitoring Program.

50
Q

What are the power supplies for the Charging Pumps?

A

East = T11D / T21D
West = T11A / T21A

51
Q

If the belnder is in AUTO and an AUTO makeup signal is received, what happens?

A

BA to the Blender (QRV-411/421) Throttles
CCP Suction QRV-400 Opens
Running BAT Pumps Shift to FAST
PW Pump in AUTO will START

52
Q

Where does letdown come from?

A

Normal L4 Cold Leg

53
Q

Where does RHR Tap into Letdown?

A

Between containment and (upstream) of letdown heat exchanger

54
Q

Where does VCT safety go to?

A

CVCS HUTs

55
Q

Which loop(s) do we normally charge to?

A

Normal Loop 4 CL
Alternate Loop 1 CL

both are normally open

56
Q

Per the Bases of TS 3.1.1 (SDM), if SDM is violated during a Main Steam Line Break, what could the consequences be?

A

There is a potential to exceed the DNBR limit and to exceed 10 CFR 50.67 limits

57
Q

Per the Bases of TS 3.1.1 (SDM), if SDM is violated during a Boron Dilution accident, what could the consequences be?

A

the time assumed for operator action to terminate dilution may no longer be applicable

58
Q

In Modes 1-3, what consists of an ECCS Train per TS 3.5.2 (ECCS - Operating)?

A

A centrifugal charging subsystem, a SI subsystem, and a RHR subsystem.

Each ECCS train includes the piping, instruments, and controls to ensure an OPERABLE flow path capable of taking suction from the RWST upon an SI signal and manually transferring suction to the containment sump.

59
Q

In Mode 4, what consists of an ECCS Train per TS 3.5.3 (ECCS - Shutdown)?

A

A centrifugal charging subsystem
and an RHR subsystem.

Each train includes the piping, instruments, and controls to ensure an OPERABLE flow path capable of taking suction from the RWST and transferring suction to the containment sump.

60
Q

Per TRO 8.1.1 (Boration Systems - Operating), can the charging pump in the RWST Flow path be the same Charging Pump in the boric acid tank flowpath?

A

NO!

There is a note that requires the charging pump in the RWST flow path to be separate from the charging pump in the boric acid tank flow path. The purpose of this note is to ensure that two separate charging pumps are OPERABLE to support boration capability with the unit in MODES 1-3.

RO34 - Revised and Upgraded Decks (84 decks)

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