Pre-course ILT CV

Question 1

When does the LD relief to the PRT lift?

Answer 1

600 psig

Question 2

When does the LD relief to the VCT lift?

Answer 2

255 psig

Question 3

What is the normal flow rate through the LD system and how is it divided amongst the 8149 valves?

Answer 3

120 gpm total
The 45 gpm valve is open and one 75 gpm valve is open

Question 4

What will cause CV129 to divert away from the LD Demins?

Answer 4

Upstream temperature >= 133 degF

Question 5

What are the five general services provided to RCS by CVCS?

Answer 5

C-REPS

Chemistry
RCS filling and draining
ECCS high head
Pressurizer level control
Seal water for RCPs

Question 6

What are the interlocks and coincidences associated with CV mini flow valves 8114 and 8116?

Answer 6

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

Question 7

What are the interlocks and setpoints associated with valves 8110 and 8111?

Answer 7

Auto close on SI with 2/4 Lo-2 RWST level 46.7%
Reset by resetting SI and SI recirc pump

Question 8

What is the normal flow rate of mini flow for CV pump recirc?

Answer 8

60 gpm per pump

Question 9

What is the normal flow rate through the Charging portion of CV?

Answer 9

100 gpm with one pump running

Question 10

What is the normal flow rate for Seal Return?

Answer 10

12 gpm

Question 11

What is the normal flow rate for Seal Injection?

Answer 11

8 gpm per seal

Question 12

What is the interlock associated with LD isolation valves 459 and 460?

Answer 12

Auto close on PZR level <17%
LD Orifice isolation valves 8149s must be closed in order to Open or Close

Question 13

What is the interlock associated with orifice isolation valves 8149 A/B/C?

Answer 13

Auto close on PZR level 17%
Phase A isolation
CV459 or CV460 close

Question 14

What is the interlock associated with Regen HX isolation valves 8389A/B?

Answer 14

Auto close if 8324 closes

Question 14

What is the interlock associated with Regen HX isolation valves 8389A/B?

Answer 14

Auto close if 8324 closes

Question 15

How is water hammer prevented in the Letdown system in the event of a low pressurizer level <17%?

Answer 15

CV459 and CV460 have bleed vent valve in vent line to ensure they close at a slower rate than orifice valves

Question 16

What is the design flow rate of the CV pumps?

Answer 16

150 gpm at 2500 psig

Question 17

What is the runout flow rate of the CV pumps?

Answer 17

550 gpm at 600 psig

Question 18

What is the shutoff head of the CV pumps?

Answer 18

2600 psig

Question 19

What happens if either VCT LT 112 or 185 reach 95%?

Answer 19

Hi 2 alarm will cause CV-112A to full divert to HUT

Question 20

What happens if LT-112 reaches 73%?

Answer 20

CV-112A will begin to modulate to the HUT

Question 21

What happens if either LT 112 or 185 reach 70%?

Answer 21

A Boron Dilution Alert Alarm will occur but it can be bypassed in Modes 1 and 2

Question 22

What happens if LT 112 reaches 55%?

Answer 22

Auto make up turns off

Question 23

What happens if LT-112 reaches 37%?

Answer 23

Auto make up on, low level alarm

Question 24

What happens if either LT 112 or 185 reach 20%?

Answer 24

Low level alarm

Question 25

What happens if either LT 112 or 185 reach 5%?

Answer 25

CV-112 D and E open CV-112 B and C close

Question 26

What is the effect on Letdown from a Phase A actuation?

Answer 26

Letdown isolation valves 8160 and 8152 close RCP seal return valves 8100 and 8112 close Orifice isolation valves 8149ABC close

Question 27

What is the effect on CV with an SI actuation?

Answer 27

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

Question 28

What is the effect on CV on a loss of Instrument Air?

Answer 28

Letdown isolates Charging isolates Seal injection and return valves fail open PW to blender 111A fails closed

Question 29

At what pressurizer level letdown iso valves close?

Answer 29

17%

Question 30

What happens if PI-131 fails high?

Answer 30

CV-131 will think pressure is too high so it will open, letdown flow increases actual pressure drops, could cause flashing in orifices

Question 31

What happens if PT-131 fails low?

Answer 31

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