Research Article

Source Term Estimation under the SBLOCA-Induced Severe Accident Condition in the SMART

Table 3

Main event times from MELCOR analysis for the small break loss-of-coolant accident in the SMART.

Main eventCase 0 (hours)Case 1 (hours)Case 2 (hours)Case 3 (hours)Case 4 (hours)

SBLOCA occurrence0.000.000.000.000.00
Reactor, reactor coolant pump, and main feedwater pump trip0.040.040.040.040.04
Fuel top exposure0.240.240.240.230.23
Fuel bottom exposure2.002.002.002.042.04
SAMG entry2.092.092.092.242.24
Oxidation start2.202.202.202.282.28
Gap release start2.252.252.252.322.32
Candling start2.472.472.472.622.62
ADS initiation2.592.592.592.742.74
CFS initiation (early)2.59N/A2.592.742.74
ACSS initiationN/AN/A4.09N/A4.24
Core support plate failure9.198.029.698.019.57
Lower plenum dry-out16.8813.7118.9516.6416.40
RV failureN/A19.09N/AN/AN/A
MCCI startN/A19.09N/AN/AN/A
CFS initiation (late)N/A74.09N/AN/AN/A