Primary Containment Isolation - 1.0 Flashcards
What systems does PCIS initiate isolations?
a. Torus Water Cleanup supply and return (Tech Spec Group 8).
b. Drywell Equipment Drain Sump and Floor Drain Sump discharge to radwaste (Tech Spec Group 9).
c. Drywell Coolers chilled water supply and return (Tech Spec Group 10).
d. CRD to Recirculation Pump seals (Tech Spec Group 11).
e. Containment Atmosphere Control Drywell and Suppression Chamber purge supply and exhaust and nitrogen purge (Tech Spec Group 12).
f. Hydrogen/Oxygen Analyzer sampling and return (Tech Spec Group 13).
g. Containment Hydrogen Recombiner supply and return (Tech Spec Group 14).
h. Primary Containment Instrument Gas supply and return (Tech Spec Group 15).
i. RACS cooling water supply and return (Tech Spec Group 16).
j. PCIG Tip Purge isolation (Tech Spec Group 17).
k. Reactor Coolant Pressure Boundary Leak Detection System sampling and return (Tech Spec Group 18).
Describe the Logic for PCIS.
There are 4 “two-out-of-two” logic channels. Each one of two valves in each penetration is closed by one channel initation. Any 3 logic initiations close all valves.
What differentiates PCIS from NSSS?
Closes valves that connect to primary containment in systems NOT connected to the RPV
What are the LOCA Level 1 isolation signals?
- -129” RPV (From Core Spray)
- 1.68 psig Drywell (From Core Spray)
- Core Spray Manual P.B.
What are the LOCA Level 1 isolation signals?
- -129” RPV (From Core Spray)
- 1.68 psig Drywell (From Core Spray)
- Core Spray Manual P.B.
What are the actuations for PCIG major?
-129” RWL
1.68 # D/W press
1 x 10-3 uCi/cc Rx Bldg Hi-Hi rad
What are the actuations for PCIG minor?
-38” RWL
1.68 # D/W press
1 x 10-3 uCi/cc Rx Bldg Hi-Hi rad
What are the actuations for XCONNECTS?
-129” RWL
1.68 # D/W press
What are the actuations for RHR A?
-129” RWL
1.68 # D/W press
What are the actuations for RHR RW & SAMPLE?
+12.5” RWL
1.68 # D/W press
What are the actuations for RHR B?
-129” RWL
1.68 # D/W press
What are the actuations for RHR SHUTDOWN CLG?
+12.5” RWL
What are the actuations for RCIC VAC BKR(64.5#)?
1.68 # D/W press
What are the actuations for HPCI VAC BKR(100#)?
1.68 # D/W press
What are the actuations for CS TEST RETURN?
-129” RWL
1.68 # D/W press
What are the actuations for FPCC HX XCONNECT?
-129” RWL
1.68 # D/W press
What are the actuations for TIPS?
-38” RWL
1.68 # D/W press
1 x 10-3 uCi/cc Rx Bldg Hi-Hi rad
What are the actuations for TWCU?
-38” RWL
1.68 # D/W press
1 x 10-3 uCi/cc Rx Bldg Hi-Hi rad
What are the actuations for DW SUMPS?
-38” RWL
1.68 # D/W press
1 x 10-3 uCi/cc Rx Bldg Hi-Hi rad
What are the actuations for PRIMARY CONTAINMENT MIMC?
-38” RWL
1.68 # D/W press
1 x 10-3 uCi/cc Rx Bldg Hi-Hi rad
What happens to the PCIS signals upon a loss of 125 VDC?
Loss of the 125 VDC buses will prevent the CS logic from initiating and sending the applicable signals to the PCIS system for Isolations/Initiations.
What does failure of a 481 inverter cause with respect to CS and PCIS logic?
Failure of the UPS power to a specififed CS logic cabinet trip relays will prevent that particular division of CS trip relays from initiating isolation functions from CS to the PCIS system
What does failure of a 482 inverter cause with respect to CS and PCIS logic?
Failure of the UPS power to a specific logic cabinet will prevent that particular division of the PCIS from initiating isolation functions
What are the logic coincidence for initiation?
- Level 1 2/2
- Level 2 2/2
- Hi Rad 2/3
If 3 logics trip, then one valve per each penetration shuts.
How can you reset PCIS?
- If only a PCIS needs to be reset, only PCIS needs to get reset.
- If a system that share PCIS and NS4 needs resetting, reset both.
- A level 2 would require a NS4 and PCIS reset. Level 1 only needs Core spray.
What are power supplies associated with PCIS?
- A-DD481 inverters power instrumentation.
- A-DD482 inverters powers bailey logic.
- Failure of inverter will inhibit the associated channel.
- A-DD417 feed CS cabinets.
Which SACS pumps starts during LOCA?
- A/B on Level 2
- All pumps on Level 1
What happens to SSW during LOCA?
- All pumps start on LOCA 2/1.
- SSW to RACS is isolated.
When does FRVS start?
On LOCA level 2.
How many channels does PCIS have?
A-D channels.
Energized to operate
1. Arm & depress of a channel will close the valves for PCIS systems.
What are the systems does PCIS isolate?
E. Isolates the following systems:
Torus Water Cleanup
Containment Atm.
Control PCIG
CRD to Recirc Seals
Drywell Equipment Drains
Drywell Chill Water
Drywell Purge
H2/02 Analyzer
H2 Recombiner
PCIG Tip Purge
RACS
Rx Coolant Leak Detection
What is the AC power supply to the CS logic?
The Class 1E instrumentation AC power supply inverters provide single phase, 120VAC to the CS logic cabinets as shown.
Inverter | Logic Cabinet
1AD481 | 10C617
1BD481 | 10C618
1CD481 | 10C641
1DD481 | 10C640
What are the inverter power supplies to the trip relays?
1(A-D)D482 inverters power (A-D)C652 trip relays.
What happens when inverter is placed in Bypass to Alternate?
Places it on the 40X bus directly.
What happens to a Loss of 482 inverter?
Failure of the UPS power to a specific logic cabinet will prevent that particular division of the PCIS from initiating isolation functions – PCIS is a bailey function
What happens on a loss of 481 inverter?
Failure of the UPS power to a specified CS logic cabinet trip relays will prevent that particular division of CS trip relays from initiating isolation functions from CS to the PCIS system.
