LOT 201.06 CVCS Flashcards
- LOT 201.06 CVCS*
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What will close the letdown orifice header isolation valve (FV-011)?
- *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
![](https://s3.amazonaws.com/brainscape-prod/system/cm/242/119/482/a_image_thumb.jpg?1524013656)
- LOT 201.06 CVCS*
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When will the letdown temperature divert valve (TCV-143) automatically bypass the demins?
Letdown HX Discharge Temp - High (137 ˚F)
OR
BTRS Demin Inlet Temp - High (157 ˚F)
![](https://s3.amazonaws.com/brainscape-prod/system/cm/242/694/211/a_image_thumb.jpg?1524038573)
Located on CP004
- Note:*
- Loss of Air/voltage fails to divert.*
- LOT 201.06 CVCS*
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What does CCW cool in the CVCS?
- *Letdown HX**
- *Seal Water HX**
- *Excess Letdown HX**
![](https://s3.amazonaws.com/brainscape-prod/system/cm/242/679/187/a_image_thumb.jpg?1524017987)
- LOT 201.06 CVCS*
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What will generate a letdown valves sequence incorrect alarm?
Shutting MOV-465 OR MOV-468 prior to FV-011
![](https://s3.amazonaws.com/brainscape-prod/system/cm/242/687/363/a_image_thumb.jpg?1524033392)
Switches located on CP004.
- Note:*
- FV-011 shuts first to prevent water hammer in the regenerative HX.*
- LOT 201.06 CVCS*
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What will automatically close the excess letdown isolation valves (MOV-082/MOV-083)?
![](https://s3.amazonaws.com/brainscape-prod/system/cm/242/803/928/q_image_thumb.jpg?1524126475)
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)
- LOT 201.06 CVCS*
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What is the purpose of the low pressure letdown control valve (PCV-135)?
![](https://s3.amazonaws.com/brainscape-prod/system/cm/242/693/615/q_image_thumb.jpg?1524037672)
- *Maintains backpressure on Letdown HX**
- Prevents flashing to steam*
During solid operations, maintains pressure of RCS.
- Note:*
- Opening valve: Pressure↓
- Shutting valve: Pressure↑
![](https://s3.amazonaws.com/brainscape-prod/system/cm/242/693/615/a_image_thumb.jpg?1524037544)
- LOT 201.06 CVCS*
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What is the purpose of the cation beds?
- *Remove Li+ and Ce+ Isotopes**
- Lowers background radiation*
![](https://s3.amazonaws.com/brainscape-prod/system/cm/242/678/784/a_image_thumb.jpg?1524017388)
pH Control
- LOT 201.06 CVCS*
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At what pressure will the VCT relief valve (CV-3101) lift?
75 psig
![](https://s3.amazonaws.com/brainscape-prod/system/cm/242/696/641/a_image_thumb.jpg?1524041576)
Relieves to the RHT.
- LOT 201.06 CVCS*
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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?
![](https://s3.amazonaws.com/brainscape-prod/system/cm/242/802/214/q_image_thumb.jpg?1524123119)
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.*
- LOT 201.06 CVCS*
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What controls are there on the ASP for the CVCS?
- *CCPs**
- *Letdown Orifices**
- *FV-11**
- *LCV-468 / LCV-465**
- *FCV-0205**
- *Charging Flow Indicator**
![](https://s3.amazonaws.com/brainscape-prod/system/cm/242/118/792/a_image_thumb.png?1523565389)
- Note:*
- FCV-0205 is not controlled from ASP. Due to fire concerns in MCR, it is controlled locally by operator.*
- LOT 201.06 CVCS*
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What will automatically close MOV-033A/B/C/D and, by doing so, isolate RCP seal injection?
- *CI ΦA **
- *WITH**
- *Charging Header Pressure - Low (≤ 560 psig)**
- Indicated on CP004 (PT-204)*
![](https://s3.amazonaws.com/brainscape-prod/system/cm/242/799/164/a_image_thumb.jpg?1524115214)
Note:
Holding switch on CP004 in “OPEN” position will override auto closure signal and allow valve to stay open.
- LOT 201.06 CVCS*
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At what pressure will the letdown relief valve (CV-3100) lift?
600 psig
![](https://s3.amazonaws.com/brainscape-prod/system/cm/242/689/315/a_image_thumb.jpg?1524030429)
Relieves to PRT.
- LOT 201.06 CVCS*
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What are the flowrates of the CVCS letdown orifices?
- *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.
![](https://s3.amazonaws.com/brainscape-prod/system/cm/242/689/068/a_image_thumb.jpg?1524030200)
- LOT 201.06 CVCS*
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What is the flowrate of the CVCS charging pump?
- *132 gpm**
- 100 gpm to RCS*
- 32 gpm to seals (8 gpm/RCP)*
- LOT 201.06 CVCS*
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What will automatically close the VCT outlet isolation valves (MOV-112B/MOV-113A)?
- 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.
![](https://s3.amazonaws.com/brainscape-prod/system/cm/242/797/183/a_image_thumb.jpg?1524114486)