Simulation of Molten Corium Concrete Interaction in a Stratified Configuration: The COMET-L2-L3 Benchmark

Bertrand Spindler, Kresna Atkhen, Michel Cranga, Jerzy Foit, Monica Garcia, Werner Schmidt, Tuomo Sevon, Claus Spengler

Research output: Contribution to conferenceConference articleScientific

Abstract

In the late phase of Molten Core Concrete Interaction (MCCI) the ablation rate becomes low and the gas flow rate issued from the concrete decomposition is reduced. Moreover the oxide phase becomes lighter than the metal phase due to the addition of the light oxide from the concrete. A large density difference and a low gas flow rate ensure that a stratified configuration will occur. The stratified configuration has then to be taken into account in the MCCI simulation tools. Only few experimental programs were conducted with stratified pools; among them the BETA tests were performed at FZK with a large test matrix. The COMET-L2 and L3 experiments were recently conducted at FZK in a stratified configuration. In the frame of SARNET WP11.2 a benchmark was organised in order to compare the MCCI code results regarding these experiments. COMET-L2 was used for a post-test simulation and after that COMET-L3 was used as a blind simulation. The participants and codes were AREVA with COSACO, CEA with TOLBIAC-ICB, EDF with TOLBIAC-ICB, FZK with WECHSL, GRS with MEDICIS and WEX, IRSN with MEDICIS, UPM with MELCOR and VTT with MELCOR. The results show a large discrepancy between the code results, due to the different models used in the stratified regime.
Original languageEnglish
Publication statusPublished - 2007
MoE publication typeNot Eligible
Event2nd European Review Meeting on Severe Accident Research, ERMSAR-2007 - Karlsruhe, Germany
Duration: 12 Jun 200714 Jun 2007

Conference

Conference2nd European Review Meeting on Severe Accident Research, ERMSAR-2007
Abbreviated titleERMSAR-2007
CountryGermany
CityKarlsruhe
Period12/06/0714/06/07

Keywords

  • severe accidents
  • MCCI
  • COMET
  • MELCOR

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    Spindler, B., Atkhen, K., Cranga, M., Foit, J., Garcia, M., Schmidt, W., Sevon, T., & Spengler, C. (2007). Simulation of Molten Corium Concrete Interaction in a Stratified Configuration: The COMET-L2-L3 Benchmark. Paper presented at 2nd European Review Meeting on Severe Accident Research, ERMSAR-2007, Karlsruhe, Germany.