Numerical Study of the Air Ingress Accident of the HTR-PM and Possible Mitigation Measures

Table 1

Simulation results at 144 h when different flow rates of helium and nitrogen are injected at 51 h.

	Without injection	N2-1.0 kg/s	N2-1.5 kg/s	N2-2.0 kg/s	He-0.005 kg/s	He-0.05 kg/s	He-0.5 kg/s
Total graphite oxidation/mol	186300	228200	62380	333.3	377	263.2	193.7
Local maximum graphite oxidation in core/mol·m^−3	16760	18660	18220	100	187.2	138.5	98.3
CO mole fraction at the outlet	0.265	0.009	0.0042	0	0	0	0
CO2 mole fraction at the outlet	0.037	0.011	0.0037	0	0	0	0
Maximum fuel temperature/°C	1210	1083	1082	1108	1260	1229	1110
Average fuel temperature/°C	870	714	673	622	857	808	629