Numerical simulation of boron dilution and cold-water transients

Boron Dilution scenarios were indentified for the use of 3D flow and mixing tools
Buoyancy driven mixing was investigated under simulated natural circulation conditions at the test facilities ROCOM and GMTF.
Hybrid meshes consisting at least of 2-8 million nodes were used.
The experiment and CFD calculations show in both cases significant mixing effects due to the density differences.
The ANSYS CFX calculations show a good qualitative agreement with the data.
CFD simulation of fibre material transport in a PWR core under loss of coolant conditions
Implementation of strainer model for the spacer grid