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 event | Case 0 (hours) | Case 1 (hours) | Case 2 (hours) | Case 3 (hours) | Case 4 (hours) |
| SBLOCA occurrence | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | Reactor, reactor coolant pump, and main feedwater pump trip | 0.04 | 0.04 | 0.04 | 0.04 | 0.04 | Fuel top exposure | 0.24 | 0.24 | 0.24 | 0.23 | 0.23 | Fuel bottom exposure | 2.00 | 2.00 | 2.00 | 2.04 | 2.04 | SAMG entry | 2.09 | 2.09 | 2.09 | 2.24 | 2.24 | Oxidation start | 2.20 | 2.20 | 2.20 | 2.28 | 2.28 | Gap release start | 2.25 | 2.25 | 2.25 | 2.32 | 2.32 | Candling start | 2.47 | 2.47 | 2.47 | 2.62 | 2.62 | ADS initiation | 2.59 | 2.59 | 2.59 | 2.74 | 2.74 | CFS initiation (early) | 2.59 | N/A | 2.59 | 2.74 | 2.74 | ACSS initiation | N/A | N/A | 4.09 | N/A | 4.24 | Core support plate failure | 9.19 | 8.02 | 9.69 | 8.01 | 9.57 | Lower plenum dry-out | 16.88 | 13.71 | 18.95 | 16.64 | 16.40 | RV failure | N/A | 19.09 | N/A | N/A | N/A | MCCI start | N/A | 19.09 | N/A | N/A | N/A | CFS initiation (late) | N/A | 74.09 | N/A | N/A | N/A |
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