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Exam 2 > CVCS > Flashcards

CVCS Flashcards

1
Q

When is RHR purification used

A

When RCS pressure is insufficient to supply letdown

Used in conjunction with normal charging

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2
Q

When is RHR slipstream used

A

Used for purification during charging outages

no inventory control

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3
Q

Discuss CS-V-459/460

A

normal letdown isolation valves
auto closes on <17% PZR AND
CS-V-145 not full open

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4
Q

Discuss CS-V-145

A 
LCV-459/460 and CS-V-149/150  are all open and PZR level >17% for 145 to go open
Auto close:
- <17% PRZ Level or
- CS-V-149/150 not full open
- LCV-V-450/460 not full open
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5
Q

Discuss CS-HCV-189/190

A

Controls letdown flow and reduces letdown pressure (PCV-131 controls pressure)

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6
Q

Discuss CS-V-149/150

A

Containment isolation valves
Auto Close on HELB or T-signal
Either valve not full open will close CS-V-145

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7
Q

What cools LTDN HX (CS-E-4)

A

A Train PCCW

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8
Q

Discuss CS-PCV-131

A

Letdown pressure control valve

Maintains 350# downstream of the drag valves

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9
Q

What closes LCV-112B/C

A

Suction for CCP from VCT
Auto close on Lo-Lo VCT level (5%, 2 of 2)
Or S-signal
closes after LCV-112D/E are full open

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10
Q

Discuss LCV-112D/E

A

CCP suction from RWST
Auto open on VCT lo-lo level 5% (2 of 2)
Or S-signal

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11
Q

Discuss CS-FCV-121

A

Control total pump flow rate: charging + seal injection

PZR master level controller controls position of FCV-121 when in auto

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12
Q

Discuss CS-HCV-182

A

Charging Header Back Pressure control Valve

Controls seal injection flow rates by controlling back pressure supply to the seals

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13
Q

Discuss CS-V-142/143

A

Containment charging isolation valves

- auto closes on S-Signal

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14
Q

Discuss CS-V-177/180

A

Charging loop isolations

provides path for alternate charging flow between loops 1 and 4

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15
Q

Discuss CS-V-185

A

PZR alternate spray valve

CS/PZR delta-T must be <320F

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16
Q

Discuss CS-V-167/168

A

Seal return and excess letdown containment isolations

Auto close on T-signal

17
Q

State interlocks on CS-LCV-459/460

A

CS-LCV-459/460 cannot be opened unless 145 is fully closed and PZR level >17%
Auto Close if PZR level is <17% and CS-V-145 goes off open seat

18
Q

State interlocks for CS-V-145

A

can not be opened unless LCV-459/460 and CS-V-149/150

Auto close on PZR lo Level <17% or LCV-459/460 not full open or CS-V-149/150 not full open

19
Q

State interlocks for CS-V-149/150

A

Closes on T-signal or HELB

20
Q

State interlocks for LCV-112B, C, D, E

A

112B,C will not auto close until 112D,E are full open

21
Q

State interlocks for PDP

A

PDP will not auto start unless CS-V-205 is full open

22
Q

State interlocks for CCP miniflow

A

CS-V-196/197
Auto close on SI if CCP flow >=122.5GPM
Opens if flow <= 82.5GPM

23
Q

State CVCS system response on SI

A

Both CCPs starts
SI-V-138/139 open (HHI to all cold legs)
CS-LCV-112D/E open
CS-V-142/143 Charging header isolations close
CS-V-196/197 Min flow isolations close if flow >=122.5GPM

24
Q

State CVCS system response on T-signal

A

Close CS-V-149/150 Containment Isolations
- Either valve not full open will cause CS-V-145
Close CS-V-167/168 Seal water return isolations

25
Q

State CVCS system response on LOP

A

Both CCPs immediately start when bus 5 and 6 are reenergized

26
Q

State CVCS system response on HELB

A

CS-V-149/150 Containment isolations will close

- Either valve not full open will cause CS-V-145 to Auto Close

27
Q

State Gallon per percent in VCT

A

31.25 gallons per %

28
Q

State Auto make up setpoints

A

Driven off of LT-112 only
50% auto make up off
30% auto make up on

29
Q

Discuss LT-112 failing LOW

A

Auto makeup is on
Low Level alarm is in
eventually VCT will divert due to high level (LT-185)

30
Q

Discuss LT-112 Failing HIGH

A

LCV-112A will divert to PDT
Auto make up is blocked
Auto swap to RWST as CCP suction at 5% VCT is blocked (2 of 2 logic)

Exam 2 (8 decks)

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