Research Article
Computational Model for the Neutronic Simulation of Pebble Bed Reactor’s Core Using MCNPX
Table 1
Characteristics of the HTR-10 fuel element.
| Parameter | Units | Value |
| Pebble diameter | cm | 6.00 | Fuel zone diameter | cm | 5.00 |
Matrix and graphite shell density | g/cm3 | 1.73 | Uranium mass per pebble | g | 5.00 | Uranium enrichment (by weight) | % | 17.00 | Natural boron impurity equivalent content on uranium | ppm | 4.00 | Natural boron impurity equivalent content on graphite | ppm | 1.30 | Core packing fraction | — | 0.61 | Fuel core | | | Kernel radius | m | 0.25 | UO2 density | g/cm3 | 10.40 | Layers | | | TRISO layers | | PyC/PyC/SiC/PyC | TRISO layers thickness | mm | 0.09/0.04/0.035/0.04 | TRISO layers density | g/cm3 | 1.1/1.9/3.18/1.9 | Dummy balls | | | Pebble diameter | cm | 6 | Graphite density | g/cm3 | 1.73 | Natural boron impurity equivalent content on graphite | ppm | 1.30 |
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