Hydrogen Safety Analysis of Ling’ao Ⅱ NPP under LOFW+ATWS Accident

This paper applies the three dimensional CFD code GASFLOW to simulate the behavior of hydrogen and steam under hypothetical LOFW+ATWS accident.Analysis shows that the average temperature and pressure are dominated by the inventory of the steam released to the containment.The calculation results also show that during the hydrogen release time,the average recombine rate of the hydrogen mitigation system can reach 40g/s,but the flame acceleration criterion in the code assess that the flame acceleration may occur in quench tank compartment and pressurizer compartment during hydrogen release peak.