Investor Presentaiton
US-ABWR SBO Response Capability Without CTG
Sequence of Events
1250
Firewater Addition Starts
Time
0.0
-
-
Event
MSIV Closure
4.2 s
Reactor Scrammed
52.0 s
RCIC Injection, Suction from CST
1.3 h
RCIC Suction Switched to Suppression Pool
4.4 h
RCIC Suction Switched to CST
8.0 h
RCIC Failure
9.0 h
9.8 h
Manual ADS
9.9 h
32.3 h
Suppression Pool began to overflow to Lower Drywell
Collapsed Water Level Falls below Top of Active Fuel
Firewater Addition System Injection Begins
Rupture Disk Opened
Core temperature peaks before fuel
damage occurs due to ACIWA water
injection
Containment pressure is maintained
below allowable limit by COPS
- No Core Damage
Pressure (MPa)
UO2 Temperature (K)
1.0
0.8
0.6
0.4
0.2
1000
750
500
250
RCIC Fails
1500
1250
1000
750
500
Maximum
250
0
0
10
20
30
40
50
60
70
Time (h)
RCIC Fails
UO2 Temperature
Rupture Disk Opens
Upper Drywell
0.0
-
No Loss of Containment Integrity
0
10
20
30
40
50
60
70
Time (h)
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Drywell Pressure
0
UO₂ Temperature (°F)View entire presentation