Can the OpenMOC program build fuel plate elements?

Hello everyone, I have been looking for many examples related to OpenMOC, but I haven’t found any concerning plate-type fuel elements. This is a single plate-type fuel element that I built using the OpenMOC program, but I always encounter kernel crashes, which I believe is due to issues in the geometric modeling. Additionally, if the rectangle is drawn as a flat source region, it is obviously non-uniform. So, how does OpenMOC address the issue of drawing a flat source region for plate-type fuel elements? Could someone help me check this? Thank you very much.