Pre-course ILT CV Flashcards
When does the LD relief to the PRT lift?
600 psig
When does the LD relief to the VCT lift?
255 psig
What is the normal flow rate through the LD system and how is it divided amongst the 8149 valves?
120 gpm total
The 45 gpm valve is open and one 75 gpm valve is open
What will cause CV129 to divert away from the LD Demins?
Upstream temperature >= 133 degF
What are the five general services provided to RCS by CVCS?
C-REPS
Chemistry
RCS filling and draining
ECCS high head
Pressurizer level control
Seal water for RCPs
What are the interlocks and coincidences associated with CV mini flow valves 8114 and 8116?
Auto-close on SI 2/4 <1448 psig
Auto open on SI 2/4 >1643 psig
Reset by resetting SI and pressing the reset buttons above each valve
What are the interlocks and setpoints associated with valves 8110 and 8111?
Auto close on SI with 2/4 Lo-2 RWST level 46.7%
Reset by resetting SI and SI recirc pump
What is the normal flow rate of mini flow for CV pump recirc?
60 gpm per pump
What is the normal flow rate through the Charging portion of CV?
100 gpm with one pump running
What is the normal flow rate for Seal Return?
12 gpm
What is the normal flow rate for Seal Injection?
8 gpm per seal
What is the interlock associated with LD isolation valves 459 and 460?
Auto close on PZR level <17%
LD Orifice isolation valves 8149s must be closed in order to Open or Close
What is the interlock associated with orifice isolation valves 8149 A/B/C?
Auto close on PZR level 17%
Phase A isolation
CV459 or CV460 close
What is the interlock associated with Regen HX isolation valves 8389A/B?
Auto close if 8324 closes
What is the interlock associated with Regen HX isolation valves 8389A/B?
Auto close if 8324 closes
How is water hammer prevented in the Letdown system in the event of a low pressurizer level <17%?
CV459 and CV460 have bleed vent valve in vent line to ensure they close at a slower rate than orifice valves
What is the design flow rate of the CV pumps?
150 gpm at 2500 psig
What is the runout flow rate of the CV pumps?
550 gpm at 600 psig
What is the shutoff head of the CV pumps?
2600 psig
What happens if either VCT LT 112 or 185 reach 95%?
Hi 2 alarm will cause CV-112A to full divert to HUT
What happens if LT-112 reaches 73%?
CV-112A will begin to modulate to the HUT
What happens if either LT 112 or 185 reach 70%?
A Boron Dilution Alert Alarm will occur but it can be bypassed in Modes 1 and 2
What happens if LT 112 reaches 55%?
Auto make up turns off
What happens if LT-112 reaches 37%?
Auto make up on, low level alarm
What happens if either LT 112 or 185 reach 20%?
Low level alarm
What happens if either LT 112 or 185 reach 5%?
CV-112 D and E open
CV-112 B and C close
What is the effect on Letdown from a Phase A actuation?
Letdown isolation valves 8160 and 8152 close
RCP seal return valves 8100 and 8112 close
Orifice isolation valves 8149ABC close
What is the effect on CV with an SI actuation?
Both CV pumps start and 8801A/B Cold Leg Injection valves open
CV suctions swap from VCT to RWST
Charging isolates via 8105 and 8106 closing
Letdown Phase A valves isolate
CV mini flows could isolate if RWST reaches Lo-2 or RCS pressure reaches 1448 psig
What is the effect on CV on a loss of Instrument Air?
Letdown isolates
Charging isolates
Seal injection and return valves fail open
PW to blender 111A fails closed
At what pressurizer level letdown iso valves close?
17%
What happens if PI-131 fails high?
CV-131 will think pressure is too high so it will open, letdown flow increases actual pressure drops, could cause flashing in orifices
What happens if PT-131 fails low?
CV-131 goes closed which builds up pressure in the letdown line and could cause relief to VCT to lift which has no alarm and could cause relief inside containment to lift at 600 psig which does have a control room alarm
