Abstract
This paper concerns the Polish MARIA reactor whose core consists of beryllium blocks forming the matrix in which fuel elements are placed. The blocks are of the tapered shape which results in the truncated square pyramid shape of the core. The currently used model for operational calculations of MARIA reactor is based on a simplified geometry built in 3D rectangular diffusion code. In this paper, a novel method is proposed for representing the tapered shape of beryllium blocks in the rectangular geometry of diffusion code. The proposed method uses, as previously, the rectangular geometry but enables to introduce height-dependent cross sections in the diffusion code which were not considered before. This approach allows to simulate height-dependent neutron-physics properties. The evaluation of the method was performed on a single 3D unit cell model.
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