Assessment of the multi-dimensional capabilities of an advanced containment code: a basic approach.

摘要

The correct prediction of mixing and stratification in large gas or water spaces is a key safety issue for nuclear reactor containments, and require capabilities that go beyond those of the traditional lumped-parameter codes. Whereas advanced, multi-dimensional containment codes exist which, in principle, should be able to provide more reliable results, only limited assessment studies of their basic capabilities have been published. In this work, a few basic, simple, single-phase problems without wall heat transfer have been analysed with the GOTHIC code, and most results compared with experimental data nad results obtained with the COmputational Fluid Dynamics (CFD) code CFX-4. Generally, reasonably good results have been obtained with GOTHIC. However, results for small time and length scales, or involving competition between inertia and buoyancy forces, need to be taken with some caution, and possibly verified by using a CFD tool.