Method for mathematically modeling the core of a nuclear reactor

摘要

In a method for computational modeling of the core (1) of a nuclear reactor, the core (1) is subdivided into a plurality of coarse meshes (2), wherein at least one coarse mesh (2) is assigned to a subarea (8) of the core (1) containing said core (1) , This subarea (8) has this coarse mesh (2) and a buffer zone (10) surrounding it in the horizontal plane, which contains at least the coarse mesh (2) immediately adjacent to this coarse mesh (2). This sub-area (8) is subdivided into a plurality of fine meshes (6) which are finer than the coarse meshes (2). On the basis of the data set assigned to each coarse mesh (2), a model of the core (1) is calculated with a nodal calculation method in a first calculation step. Subsequently, on the basis of each fine mesh (6) of a subarea (8) respectively associated second data set and calculated in the first calculation step streams (J) at the edge of this subarea (8) in a second calculation step with a nodal calculation method, a model for this Subarea (8) calculated.