Major Valves and Interlocks Flashcards
What is ICM-305/306?
RHR Suction from Recirc
What is IMO-215/225
RWST to CTS Pump
What is IMO-310/320 ?
RHR Suction Valves
What is IMO-330/331 ?
RHR to Upper Spray
What is IMO-340/350 ?
RHR to CCP / SI Suction
What is IMO-262/263 ?
SI Recirc to RWST
To Open the Recirc Sump valve ICM-305, what alignment must you have?
Can’t go onto recirc sump unless your isolated from the RSWT via RHR and CTS suctions
To Open the CCP or SI pp Suction from the RHR Pumwhat alignment must you have?
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
To open RHR Spray valves, what alignment must you be in?
Must be on recirc sump
To Open your RHR pump suction valve, what alignment must you have?
Can’t be on the recirc sump, trying to Spray, or trying to supply CCP / Si with water from RHR
What is the normal position for RWST Valves to CCP Suction IMO-910 and 911 and what auto opens them?
Parallel, normally-closed, motor-operated Automatically open on SI signal Automatically open on Refueling Water Sequence: low-level (2.5%) in VCT
How to the CCP Emergency Leak-off Valves (ELO) QMO-225 and 226 work on a SI?
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
CCP Emergency Leak-off Valves (ELO) QMO-225 and 226 continue to cycle on pressure after a SI until?
SI signal is reset Control switch placed in PULL TO RESET position - resets SI seal-in circuit
East CCP Emergency Leak-off Valves QMO-225 receives pressure signal from
NPP-151
West CCP Emergency Leak-off Valves QMO-226 receives pressure signal from
NPP-153
What are BIT Inlet Valves, IMO-255 and 256 Normal position and auto alignment?
Parallel, normally-closed Open on SI signal to provide injection flowpath to RCS cold legs through BIT
What are BIT Outlet Valves, ICM-250 and 251 Normal position and auto alignment?
Parallel, normally-closed Open on SI signal to provide injection flowpath to RCS cold legs through BIT
Cold Leg Injection Valves, IMO-51/52/53/54 normal position and purpose
Normally open Isolate loop specific injection line
IMO-340 East RHR HX to Charging Pumps Suction Supply Normal Position and Purpose?
Normally closed Aligns RHR pump discharge to CCP suction header
When is IMO-340 East RHR HX to Charging Pumps Suction Supply Open?
Open for cold leg recirculation
What are the interlocks with IMO-340 East RHR HX to Charging Pumps Suction Supply in order to open this valve ?
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
What are Recirc Sump to RHR Suction Valves ICM 305 and 306 Interlocks?
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.
What are the interlocks with IMO-350 West RHR HX to Charging Pumps Suction Supply in order to open this valve ?
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
What are the interlocks for IMO-330 and 331 RHR to Upper spray header to open?
Recirc sump isolation valves ICM-305 and 306 must be open
What are the interlocks for IMO-310 and 320 RHR Suction from RWST to open?
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.
What is the purpose of the ICM-305 and 306 suction fro, recirc sump interlocks for opening RHR Pump Suction Valves IMO-310/320?
prevent draining RWST to recirculation sump
What is the purpose of the IMO-330/331 RHR to upper spray interlocks for opening RHR Pump Suction Valves IMO-310/320?
prevent pumping RWST to upper spray nozzles before cold leg recirculation properly aligned
What is the purpose of the IMO-340/350 interlocks for opening RHR Pump Suction Valves IMO-310/320?
prevent aligning CCP/SI pump suctions to recirculation sump
What is RC Loop #2 hot leg to RHR Suction IMO-128 interlocked to ?
will NOT open if RCS pressure > 411 psig on NPS-122, Loop 1 Ch3
What is the RC Loop #2 Hot Leg to RHR Suction IMO-129 interlocked to?
will NOT open if RCS pressure > 411 on psig NPS-121, Loop 2 Ch2
How does IRV-311 RHR Hx Bypass Valve fail on loss of air?
Open
How do RHR Hx Outlet valves IRV-310 and 320 fail?
Open
What is the NORMAL COOLDOWN FLOWPATH for RHR?
Suction from Loop 2 Hot Leg Discharges to Loops 2 and 3 Cold Legs via ICM-111 thru both Hx and Hx Bypass
What is the ALTERNATE COOLDOWN PATH for RHR?
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
Do Cold Leg Loops 1 and 4 have thermal sleeves?
NO
Do Cold Leg Loops 2 and 3 have thermal sleeves?
YES
What is the INJECTION FLOWPATH for RHR?
Suction from RWST Discharges to Loops 1-4 Cold Legs with all flow thru the Hxs
What are the 3 LTOP Protections? 270*F (300*F)
RC Loop 2 Hot Leg to RHR Suction safety valve SV-103 2 PZR PORVS >2 inch RCS vent
Whate are the interlocks on th Clean and Dirty Waste HUT Inlet Valves?
Both cannot be closed at the same time. This ensures you always have a flowpath for drains
What is the interlock on Liquid waste to U1/U2 discharge tunnel shuteoff valves RRV-287/286?
You cannot open unless at least 1 CW Pump is I/S
What is the interlock on the GDT Inlet Valves?
Interlocked so that if 1 is open, all the others remain closed
can’t have more than 1 open at a time
