Analysis of the First Separate Effect VULCANO Test on Molten Core Concrete Interaction with an Oxidic Prototypic Corium
In the hypothetical case of a Pressurized Water Reactor severe accident, the core could melt and, eventually interact with the reactor pit concrete. Recent Molten Core Concrete Interaction tests, conducted by the CEA on the VULCANO experimental facility, have shown that, whereas the ablation of limestone-rich concretes is almost isotropic, the ablation of silica rich concretes is much faster towards the sides than towards the bottom of the cavity. In order to determine which parameter has a discriminating influence on the concrete ablation shape, CEA has proposed to use analytic concretes and prototypic corium for Separate Effect tests in the VULCANO facility. This paper synthesizes the first Separate Effect test (VB-ES-U2) performed with a cement clinker-based concrete rich in calcium oxide but poor in carbon dioxide in order to assess the effect of the molten concrete chemical composition. In this test, ablation was strongly anisotropic although the molten concrete composition was identical as in the previous VB-U6 test with limestone-rich concrete, for which an isotropic ablation had been observed. The experimental results are presented, discussed and compared to calculations with the TOLBIAC-ICB computer code based on the phase segregation model and the interaction between thermalhydraulics and physicochemistry. If the ratio of the lateral to the vertical heat flux is provided as a user input and as the induction heating is enough to reach the MCCI steady state, our models describe properly occurring heat and mass transfers. The TOLBIAC-ICB numerical results lead to a satisfactory agreement with the experiment.
Severe Accident Corium Concrete Thermalhydraulics
Jean-Fran?ois Haquet Christophe Journeau Lionel Ferry Laurent Pichon
CEA, DEN, STRI, LMA, Cadarache F13108 St Pau lez Durance, France Intern from Troyes University of Technology
国际会议
上海
英文
1481-1493
2010-10-10（万方平台首次上网日期，不代表论文的发表时间）