Freezing of the LFR primary pool: CFD modeling and preliminary analysis on prototypical configuration

In the context of GEN-IV Heavy Liquid Metal safety studies, the lead freezing in the pool is considered one of the main issues to be addressed and a realistic accident for LFR. The present document is a first step towards a detailed analysis of such phenomena, and a CFD model and approach is presented to have a detailed thermo-fluid dynamic picture in the case of freezing. In particular, a numerical methodology is presented to model the freezing of lead and the heat transfer in a proper way. At this stage, examples are given on a very simplified and prototypical geometry representing the primary pool of the LFR DEMO.