Three-Dimensional Analysis of Steam/Hydrogen Transport with Catalytic Recombiners in Nuclear Reactor Containments Using the Computer Code GASFLOW

摘要

The GASFLOW code has been applied for the analysis of the steam/hydrogen distribution with mitigation by catalytic recombiners under conditions of a large break loss-of-coolant accident for 3D containment models of two different types of German pressurized water reactors (PWRs). The contribution describes the developed 3D containment models, the applied concept for recombiner positioning, and it discusses the calculated results in relation to the applied source term which wa sthe same in both containments. It identifies the principal mechanisms that determine the hydrogen mixing in these two containments, and it shown up generic differences to similar simulations performed with lumped paraeter codes.