Major Valves and Interlocks

Question 1

To Open the Recirc Sump valve ICM-305, what alignment must you have?

Answer 1

Can’t go onto recirc sump unless your isolated from the RSWT via RHR and CTS suctions

Question 2

To Open the CCP or SI pp Suction from the RHR Pumwhat alignment must you have?

Answer 2

Can’t supply the CCP or SI pump with water from RHR pump unless you’re on the recirc sump and the SI pump recirc back to the RWST is isolated bc you’d pump your recirc sump to RWST

Question 3

To open RHR Spray valves, what alignment must you be in?

Answer 3

Must be on recirc sump

Question 4

To Open your RHR pump suction valve, what alignment must you have?

Answer 4

Can’t be on the recirc sump, trying to Spray, or trying to supply CCP / Si with water from RHR

Question 5

What is the normal position for RWST Valves to CCP Suction IMO-910 and 911 and what auto opens them?

Answer 5

Parallel, normally-closed, motor-operated Automatically open on SI signal Automatically open on Refueling Water Sequence: low-level (2.5%) in VCT

Question 6

How to the CCP Emergency Leak-off Valves (ELO) QMO-225 and 226 work on a SI?

Answer 6

Close on SI signal Open after2 sec time delay with SI signal present and RCS pressure above 1825 PSIG. Close if RCS pressure drops below 1812 PSIG

Question 7

CCP Emergency Leak-off Valves (ELO) QMO-225 and 226 continue to cycle on pressure after a SI until?

Answer 7

SI signal is reset Control switch placed in PULL TO RESET position - resets SI seal-in circuit

Question 8

East CCP Emergency Leak-off Valves QMO-225 receives pressure signal from

Answer 8

NPP-151

Question 9

West CCP Emergency Leak-off Valves QMO-226 receives pressure signal from

Answer 9

NPP-153

Question 10

IMO-340 East RHR HX to Charging Pumps Suction Supply Normal Position and Purpose?

Answer 10

Normally closed Aligns RHR pump discharge to CCP suction header

Question 11

When is IMO-340 East RHR HX to Charging Pumps Suction Supply Open?

Answer 11

Open for cold leg recirculation

Question 12

What are the interlocks with IMO-340 East RHR HX to Charging Pumps Suction Supply in order to open this valve ?

Answer 12

ICM-305 Recirc Sump Suction must be Opened and have control power IMO-262 OR IMO-263 SI mini flow must have control power and be closed

Question 13

What are Recirc Sump to RHR Suction Valves ICM 305 and 306 Interlocks?

Answer 13

Will not open unless RHR Suction from RWST Iso valves are closed (IMO-310 and 320) AND CTS suction from RWST Iso valves (IMO-215 and 225) are closed.

Question 14

What are the interlocks with IMO-350 West RHR HX to Charging Pumps Suction Supply in order to open this valve ?

Answer 14

ICM-306 Recirc Sump Suction must be Opened and have control power IMO-262 OR IMO-263 SI mini flow must have control power and be closed

Question 15

What are the interlocks for IMO-330 and 331 RHR to Upper spray header to open?

Answer 15

Recirc sump isolation valves ICM-305 and 306 must be open

Question 16

What are the interlocks for IMO-310 and 320 RHR Suction from RWST to open?

Answer 16

Recirc sump iso valves ICM-305 and 306 must be closed RHR to upper containment spray IMO-330 and 331must be closed RHR to CCP (IMO-340) and RHR to SI (IMO-350) suction header iso valves must be closed.

Question 17

What is the purpose of the ICM-305 and 306 suction fro, recirc sump interlocks for opening RHR Pump Suction Valves IMO-310/320?

Answer 17

prevent draining RWST to recirculation sump

Question 18

What is the purpose of the IMO-330/331 RHR to upper spray interlocks for opening RHR Pump Suction Valves IMO-310/320?

Answer 18

prevent pumping RWST to upper spray nozzles before cold leg recirculation properly aligned

Question 19

What is the purpose of the IMO-340/350 interlocks for opening RHR Pump Suction Valves IMO-310/320?

Answer 19

prevent aligning CCP/SI pump suctions to recirculation sump

Question 20

What is RC Loop #2 hot leg to RHR Suction IMO-128 interlocked to ?

Answer 20

will NOT open if RCS pressure > 411 psig on NPS-122, Loop 1 Ch3

Question 21

What is the RC Loop #2 Hot Leg to RHR Suction IMO-129 interlocked to?

Answer 21

will NOT open if RCS pressure > 411 on psig NPS-121, Loop 2 Ch2

Question 22

How does IRV-311 RHR Hx Bypass Valve fail on loss of air?

Answer 22

Open

Question 23

How do RHR Hx Outlet valves IRV-310 and 320 fail?

Answer 23

Open

Question 24

What is the NORMAL COOLDOWN FLOWPATH for RHR?

Answer 24

Suction from Loop 2 Hot Leg Discharges to Loops 2 and 3 Cold Legs via ICM-111 thru both Hx and Hx Bypass

Question 25

What is the ALTERNATE COOLDOWN PATH for RHR?

Answer 25

Suction from Loop 2 Hot Leg Discharges to Loops 2 and 3 OR 1 and 4 Cold Legs, NOT using ICM-111 Choice is temperature dependednt

Question 26

Do Cold Leg Loops 1 and 4 have thermal sleeves?

Answer 26

NO

Question 27

Do Cold Leg Loops 2 and 3 have thermal sleeves?

Answer 27

YES

Question 28

What is the INJECTION FLOWPATH for RHR?

Answer 28

Suction from RWST Discharges to Loops 1-4 Cold Legs with all flow thru the Hxs

Question 29

What are the 3 LTOP Protections? 270*F (300*F)

Answer 29

RC Loop 2 Hot Leg to RHR Suction safety valve SV-103 2 PZR PORVS >2 inch RCS vent

Question 30

Whate are the interlocks on th Clean and Dirty Waste HUT Inlet Valves?

Answer 30

Both cannot be closed at the same time. This ensures you always have a flowpath for drains

Question 31

What is the interlock on Liquid waste to U1/U2 discharge tunnel shuteoff valves RRV-287/286?

Answer 31

You cannot open unless at least 1 CW Pump is I/S

Question 32

What is the interlock on the GDT Inlet Valves?

Answer 32

Interlocked so that if 1 is open, all the others remain closed

can’t have more than 1 open at a time