ASTEC–MAAP Comparison of a 2 Inch Cold Leg LOCA until RPV Failure

Table 5

Key results in the SBLOCA predicted by ASTEC and MAAP.

Event	ASTEC_REF	MAAP_REF	ASTEC_SEN	MAAP_SEN
Integrated liquid break mass at 200 seconds	26600 kg	21900 kg	26600 kg	21900 kg
Integrated liquid break mass at 1e4 seconds	143395 kg	120830 kg	136593 kg	120830 kg
Integrated gas break mass at 1e4 seconds	68800 kg	71924 kg	80188 kg	66775 kg
Primary pressure at 1500 seconds	7.3e6 Pa	7.2e6 Pa	7.3e6 Pa	7.2e6 Pa
Primary pressure at 1e4 seconds	1.0e6 Pa	2.2e6 Pa	1.9e6 Pa	1.1e6 Pa
Accumulator discharged mass	44.16 tons	66.94 tons	68.26 tons	44.16 tons
In-vessel hydrogen generation	528 kg	605 kg	586 kg	502 kg
Total relocated mass	167 tons	127 tons	147 tons	127 tons
Highest slumping rate	15100 kg/s	788 kg/s	13100 kg/s	607 kg/s
Maximum corium pool temperatures	2760 K	2850 K	2665 K	2850 K
Lower head wall location	0.4 m below cylinder	0.55 m below cylinder	0.55 m below cylinder	0.55 m below
Type of RPV failure	Creep rupture by focusing effect	Creep rupture	Creep rupture by focusing effect	Creep rupture