LOT 201.06 CVCS Flashcards
- LOT 201.06 CVCS*
- *
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
- LOT 201.06 CVCS*
- *
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)
Located on CP004
- Note:*
- Loss of Air/voltage fails to divert.*
- LOT 201.06 CVCS*
- *
What does CCW cool in the CVCS?
- *Letdown HX**
- *Seal Water HX**
- *Excess Letdown HX**
- LOT 201.06 CVCS*
- *
What will generate a letdown valves sequence incorrect alarm?
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.*
- LOT 201.06 CVCS*
- *
What will automatically close the excess letdown isolation valves (MOV-082/MOV-083)?
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*
- *
What is the purpose of the low pressure letdown control valve (PCV-135)?
- *Maintains backpressure on Letdown HX**
- Prevents flashing to steam*
During solid operations, maintains pressure of RCS.
- Note:*
- Opening valve: Pressure↓
- Shutting valve: Pressure↑
- LOT 201.06 CVCS*
- *
What is the purpose of the cation beds?
- *Remove Li+ and Ce+ Isotopes**
- Lowers background radiation*
pH Control
- LOT 201.06 CVCS*
- *
At what pressure will the VCT relief valve (CV-3101) lift?
75 psig
Relieves to the RHT.
- 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?
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*
- *
What controls are there on the ASP for the CVCS?
- *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.*
- LOT 201.06 CVCS*
- *
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)*
Note:
Holding switch on CP004 in “OPEN” position will override auto closure signal and allow valve to stay open.
- LOT 201.06 CVCS*
- *
At what pressure will the letdown relief valve (CV-3100) lift?
600 psig
Relieves to PRT.
- LOT 201.06 CVCS*
- *
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.
- LOT 201.06 CVCS*
- *
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*
- *
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.