Application of ASTEC, MELCOR, and MAAP Computer Codes for Thermal Hydraulic Analysis of a PWR Containment Equipped with the PCFV and PAR Systems

Table 2

Main results of the in-vessel severe accident analysis important for the latter containment behaviour.

Parameter	ASTEC	MELCOR	MAAP
Mass of water released from the RCS before the RPV failure	128000 kg	105000 kg	130000 kg
Mean mass flow rate at the break	11 kg/s	9 kg/s	11 kg/s
Temperature of released water/steam	600–1100 K	600–1100 K	600–1000 K
Mass of hydrogen produced in the RPV	268 kg	211 kg	265 kg
RCS pressure at the time of the RPV failure	5.6 MPa	7.8 MPa	6.9 MPa
Mass of material released from the RPV	85700 kg	87500 kg	88000 kg
Temperature of released material	2400 K	2120 K	2330 K
Long term decay heat level in the material accumulated in the cavity	4–14 MW