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Systems Test 2 > LOT 201.06 CVCS > Flashcards

LOT 201.06 CVCS Flashcards

1
Q
  • LOT 201.06 CVCS*
    • *

What will close the letdown orifice header isolation valve (FV-011)?

A
  • *CI ΦA**
  • *PZR Lvl - Low (17%)**
  • LT-0465 OR LT-0468*
  • *Loss of Air**
  • *Loss of MCC E1C1**
  • PZR Low Lvl on LT-0465 will close LCV-465 after 10 sec TD.
  • PZR Low Lvl on LT-0468 will close LCV-468 after 10 sec TD.
  • Note:*
  • To reopen FV-011:*
  • PZR LVL > 17% on LT-0465 AND LT-0468
  • LCV-465 AND LCV-468 open
  • CI ΦA signal not present
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2
Q
  • LOT 201.06 CVCS*
    • *

When will the letdown temperature divert valve (TCV-143) automatically bypass the demins?

A

Letdown HX Discharge Temp - High (137 ˚F)
OR
BTRS Demin Inlet Temp - High (157 ˚F)

Located on CP004

  • Note:*
  • Loss of Air/voltage fails to divert.*
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3
Q
  • LOT 201.06 CVCS*
    • *

What does CCW cool in the CVCS?

A
  • *Letdown HX**
  • *Seal Water HX**
  • *Excess Letdown HX**
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4
Q
  • LOT 201.06 CVCS*
    • *

What will generate a letdown valves sequence incorrect alarm?

A

Shutting MOV-465 OR MOV-468 prior to FV-011

Switches located on CP004.

  • Note:*
  • FV-011 shuts first to prevent water hammer in the regenerative HX.*
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5
Q
  • LOT 201.06 CVCS*
    • *

What will automatically close the excess letdown isolation valves (MOV-082/MOV-083)?

A

Nothing

The immediate action for a SI or CI ΦA is for the operator to shut MOV-082 and MOV-083.

  • Prevents damage to the CCW side of the excess letdown HX
  • Prevents LOCA through Seal Header Relief valve. (150 psig)
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6
Q
  • LOT 201.06 CVCS*
    • *

What is the purpose of the low pressure letdown control valve (PCV-135)?

A
  • *Maintains backpressure on Letdown HX**
  • Prevents flashing to steam*

During solid operations, maintains pressure of RCS.

  • Note:*
  • Opening valve: Pressure↓
  • Shutting valve: Pressure↑
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7
Q
  • LOT 201.06 CVCS*
    • *

What is the purpose of the cation beds?

A
  • *Remove Li+ and Ce+ Isotopes**
  • Lowers background radiation*

pH Control

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8
Q
  • LOT 201.06 CVCS*
    • *

At what pressure will the VCT relief valve (CV-3101) lift?

A

75 psig

Relieves to the RHT.

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9
Q
  • LOT 201.06 CVCS*
    • *

Seal water return is normally directed to the suction of the CCPs. When would it become necessary to direct it to the spray of the VCT instead?

A

Need to maintain H2 when normal letdown secured

  • Note:*
  • Excess letdown may be used instead of normal letdown but seal return must be aligned to VCT.*
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10
Q
  • LOT 201.06 CVCS*
    • *

What controls are there on the ASP for the CVCS?

A
  • *CCPs**
  • *Letdown Orifices**
  • *FV-11**
  • *LCV-468 / LCV-465**
  • *FCV-0205**
  • *Charging Flow Indicator**

  • Note:*
  • FCV-0205 is not controlled from ASP. Due to fire concerns in MCR, it is controlled locally by operator.*
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11
Q
  • LOT 201.06 CVCS*
    • *

What will automatically close MOV-033A/B/C/D and, by doing so, isolate RCP seal injection?

A
  • *CI ΦA **
  • *WITH**
  • *Charging Header Pressure - Low (≤ 560 psig)**
  • Indicated on CP004 (PT-204)*

Note:
Holding switch on CP004 in “OPEN” position will override auto closure signal and allow valve to stay open.

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12
Q
  • LOT 201.06 CVCS*
    • *

At what pressure will the letdown relief valve (CV-3100) lift?

A

600 psig

Relieves to PRT.

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13
Q
  • LOT 201.06 CVCS*
    • *

What are the flowrates of the CVCS letdown orifices?

A
  • *120 gpm - 150 gpm**
  • Normally in service*
  • *85 gpm - 100 gpm**
  • *25 gpm - 30 gpm**

Flowrate based on 2235 psig in RCS.

  • Note:*
  • FV-012 (120 gpm - 150 gpm) and FV-013 (85 gpm - 100 gpm) are air operated and fail close on loss of air.
  • FV-014 (25 gpm - 30 gpm) is a MOV.
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14
Q
  • LOT 201.06 CVCS*
    • *

What is the flowrate of the CVCS charging pump?

A
  • *132 gpm**
  • 100 gpm to RCS*
  • 32 gpm to seals (8 gpm/RCP)*
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15
Q
  • LOT 201.06 CVCS*
    • *

What will automatically close the VCT outlet isolation valves (MOV-112B/MOV-113A)?

A
  • MOV-112B AND MOV-113A*
  • *SI**
  • Opens MOV-112C AND MOV-113B*
  • MOV-112B*
  • *VCT Level - Low 2 (3%) [LT-112]**
  • Opens MOV-112C*
  • MOV-113A*
  • *VCT Level - Low 2 (3%) [LT-113]**
  • Opens MOV-113B*

To ensure CCPs have suction water at all times, RWST supply valves (MOV-112C/MOV-113B) must be full open to close respective VCT Outlet valve (MOV-112B/MOV-113A).

  • Note:*
  • Holding the manual switches for the valves (112B/C and 113A/B) will override any auto functions and the valves will position as selected.
  • Located on CP004.
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16
Q
  • LOT 201.06 CVCS*
    • *

What will close the letdown CIVs (CV-023 / CV-024)?

A
  • *CI ΦA**
  • *High Energy Line Break**
  • 112.7 ˚F [1/8] in MAB room shuts associated valve*
17
Q
  • LOT 201.06 CVCS*
    • *

At what pressure will the low pressure letdown relief valve (CV-3201) lift?

A

300 psig

Relieves to VCT.

18
Q
  • LOT 201.06 CVCS*
    • *

With regards to LT-112 and LT-113, how is level controlled in the VCT?

A
  • 95%*
  • *112A Full Divert**
  • LT-112 AND LT-113*
  • *Alarm**
  • LT-113*
  • 68% - 95%*
  • *112A modulates diverting to RHT**
  • LT-112*
  • 48%*
  • *Stops Auto M/U**
  • LT-112*
  • 28%*
  • *Starts Auto M/U**
  • LT-112*
  • 15%*
  • *Alarm**
  • LT-112 AND LT-113*
  • 3%*
  • *Shifts CCP suction from VCT to RWST (112C / 113B)**
  • *Isolates VCT outlet (112B / 113A)**
  • LT-112 AND LT-113*
19
Q
  • LOT 201.06 CVCS*
    • *

If letdown flow is isolated when Tavg is > 350 ˚F, what must also be done?

A

Charging must be isolated

Prevents thermal shock to RCS loops due to cold charging water.

  • Note:*
  • Isolating letdown secures the “heating” aspect of the Regenerative HX.*
20
Q
  • LOT 201.06 CVCS*
    • *

What are the gal/% thumb rules for the VCT and PZR?

A
  • PZR:*
  • *68.3 gal/%**
  • VCT:*
  • *33.9 gal/%**

Used to calculate leak rate

Systems Test 2 (15 decks)

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