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The stabilization of molten core material in the lower head in case of a severe accident by external cooling of the reactor vessel is regarded as an effective severe accident management measure. In the experiments LIVE-L10 and -L11 the late phase melt pool behaviour of the corium is investigated under different cooling conditions – the former under sub-cooled convection, the latter under nucleate boiling conditions. In this work the experiments are calculated with the severe accident analysis code AC 2  – ATHLET-CD 3.1A. Objective of the simulations conducted is the analysis and assessment of the code's capability to simulate the most relevant phenomena that occur during the tests. The simulations are performed with two different lower head modules implemented in ATHLET-CD, AIDA ( A nalysis of the  I nteraction between Core  D ebris and the reactor pressure vessel during severe  A ccidents) and LHEAD (extended  L ower  Head  module). The simulation results, analysed in comparison with the experimental results, show the capability of both modules to reproduce the respective experiments.

Comparative analysis of simulations of LIVE-L10 and -L11 experiments using different lower head modules of AC 2