Very high temperature reactor (VHTR) designs offer promising performance characteristics; they can provide sustainable energy,\nimproved proliferation resistance, inherent safety, and high temperature heat supply. These designs also promise operation to\nhigh burnup and large margins to fuel failure with excellent fission product retention via the TRISO fuel design. The pebble bed\nreactor (PBR) is a design of gas cooled high temperature reactor, candidate for Generation IV of Nuclear Energy Systems. This\npaper describes the features of a detailed geometric computational model for PBR whole core analysis using the MCNPX code.\nThe validation of the model was carried out using the HTR-10 benchmark. Results were compared with experimental data and\ncalculations of other authors. In addition, sensitivity analysis of several parameters that could have influenced the results and the\naccuracy of model was made
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