<p>Under the severe accident condition, the containment is the last shielding for preventing the inadvertent release of radioactive fission products to the atmosphere. In order to figure out the failure margin in accident condition, it is necessary to research and analyze the affects of surface liquid film coverage on the containment safety. The thermal-hydraulic model of Passive Containment Cooling System has been built with passive containment analysis code in Large Power Passive Reactor. Based on the reference conditions of Double Ended Guillotine (DEG) on a cold leg and Main Steam Line Break (MSLB), the sensitivity analysis of parameters related to surface liquid film coverage has been performed, the cases of the water distribution tube failure, and the spray pipe pluggage added the failure of water distribution tube, and the scram under different power level have been carried out, respectively. Results: The analysis results show that: (1) the containment would fail in 24 hours after DEG accident start as a result of the liquid film coverage lower than 45%; (2)under the MSLB condition, the containment pressure is highest when scram power level is 30% of Fission Power (FP) under keeping the design water film coverage, and with decrease of water film coverage, the containment is not fail as a result of overpressure, although the pressure is highest on the scram power level 0% FP.</p>

Affect Analysis of Surface Liquid Film Coverage on the Safety Performance of Containment

Paper Proceedings: https://asmedigitalcollection.asme.org/ICONE/ICONE28/volume/85246

2021 28th International Conference on Nuclear Engineering (ICONE28)

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