Simulation of multiphysics in a NPP containment using combined codes with different spatial resolution

In this paper the possibilities of multiphysics simulations related to nuclear reactor safety by coupling models respectively codes of different spatial resolution are discussed. One type of models is realized recently in the so called lumped parameter (LP) code COCOSYS (the Containment Code System) [1]. The other type of models are based on 3D Navier-Stokes equations and 3D heat conduction equations. A special realization of such models for containment applications is done in the recently developed code CoPool [2]. The aim of this work is to increase the accuracy of containment simulations by interaction of both types of models.