The objective of this study is to compare containment simulation results predicted by MAAP4-CANDU v4.0.7 and GOTHIC v7.2b for a Station Blackout severe core damage accident, when the containment dousing spray system is not credited.

The input parameters (mass and energy source terms into containment) for GOTHIC were generated by MAAP4-CANDU for the Station Blackout sequence. The GOTHIC (lumped parameter model) and MAAP4-CANDU containment nodalization models were very similar, thus facilitating direct comparison of the results.

Analysis of the results demonstrated that the simulation results obtained with the two codes are similar. Good agreement was obtained for the containment pressure, gas temperature and containment atmosphere composition predictions.

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