Containment Purge and Ventilation Flashcards
3.6.4 containment pressure
-0.1 to 1.0 psig
3.6.5 containment temperature
The average inlet temperatures of the running RCFCs shall be <=120F
If CRDM exhaust air temperature increases above ____ proceed to unit shutdown and reduce Tave to below ____.
165F
350F
What is temperature limit on the CRDM coils?
392F
With ____ or more CRDM exhaust fans inoperable: ____.
3
Shutdown and Tave<350F
RX vessel head cooldown during Nat. circ.
-45F to 54F per hour
with fans
-1 F/hr no fans
CNMT charcoal unit fans trip on ____ or _____.
Overcurrent
or
Deluge activated
CRDM booster fans controlled from ___ and CRDM exhaust fans controlled from _____.
0PM02J
0PM02J and RSP
U1 peak LOCA P
U2 peak LOCA P
42.8 psig
38.4 psig
CNMT charcoal filter DP alarms
Prefilter
Hepa
1.0” H20
2.0” H20
CRDM fans must be on whenever ____ or _____.
CRDM coils energized
or
RCS T >350F
Power supplies of purge and exhaust fans
133x/134x
Initiation signals for CVI
-Any SI
-Manual Phase A
-Manual CS
-Cnmt air area rad monitor
AR011J controls train ____ dampers
AR012J controls train ____ dampers.
Train A
Train B
Which dampers close on CVI?
TrainA
VQ001a, 002A, 004A, 005A and C
Train B
VQ001B, 002B, 003, 004B, 005B
Sources of hydrogen post LOCA?
- Radiolytic decomposition.
- Zirc water reaction
- Hydrogen release from RCS.
- Plant material corrosion
Normal purge supply fan starting interlocks
1VQ001y open
VQ001A and B open
Other fan disch shut
Auto trips of purge supply fan (4)
Starting interlocks not met
Inlet air temp <40F
Smoke detected in air supply. w/purge CS in normal.
Overcurrent
Purge exhaust fan starting interlocks
VQ002A/B open
Other fan disch shut
Either supply running
Mini purge exhaust fan start interlocks
VQ005a/b/c all open
Function of post-loca purge
Backup to hydrogen recombiners to purge the cnmt atmosphere of hydrogen. Maintain h2 <4% post loca
Purge dampers must be _____ in modes _____.
De-energized closed
Modes 1-4
When swapping RCFC from high to low speed there is _____.
20 second time delay whether SI present or not
CNMT chilled water response to SI actuation
- Cnmt isolation valves close on Phase A.
- Running CW pump trips.
- Chiller trips
- SX112 & 114A/B close
- SX147A/B open
What happens to RCFC on SI?
- High speed RCFC trip
- After 20 sec TD, all fans start in slow.
- RCFC SX in/out all open. SX016 rcfc gets esf open signal.
SX027 out looks at breaker close of rcfc fans.
What are the inputs to the RCFC accident mode red lights?
low speed breaker closed
sx016 open
sx027 open
sx112a closed
sx114a closed
sx147A open
RCFC high vibration
Alarms on MCB, seals in, must be reset on pm06j
1sx016A/1sx027A must be ____ for manual 1a SX pump start. Same for 1B sx pump with B components.
open
Reactor cavity cooling fans function:
1) Provide cooling air to:
a) Excore instrument wells and cable junction boxes
b) Space between the reactor vessel and the biological shield
If containment pressure out of band, restore in ___ hours or be in Mode 3 ____ hours Mode 5 ____ hours.
1 hour
6 hours
36 hours
If containment temperature >=120F, what actions?
c. Major Actions
1) Restore within 8 hours OR,
2) MODE 3 in 6 hours AND MODE 5 in 36 hours
Are both the supply and exhaust mini-flow purge fans allowed to be operated simultaneously?
Only if they are opened under administrative controls (per SR 3.6.3.2)
Explain how the RCFC units are cooled during normal operating conditions.
a. First Stage – cooled by Essential Service Water
b. Second Stage – cooled by Cnmt Chilled Water which is cooled by Essential Service Water.
Excore limitation ____F and alarm ____F.
135F
140F
Why is slow speed required during accident for RCFCs?
Humid air will put more load on fans causing overload of fans and/or electrical busses
WO pump will trip if ______ in both the _____ flowpaths.
…one or more containment isolation valves closed in both train A and B flowpaths.
What are the interlocks to start a cavity fan, CRDM booster fan, or CRDM exhaust fan?
None
