# The pin-by-pin function of plate fuel using OpenMC is bad

**URL:** <https://openmc.discourse.group/t/the-pin-by-pin-function-of-plate-fuel-using-openmc-is-bad/5291>\
**Category:** User Support\
**Created:** [March 5, 2025, 4:29am UTC](https://openmc.discourse.group/t/the-pin-by-pin-function-of-plate-fuel-using-openmc-is-bad/5291 "2025-03-05T04:29:21Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Lishuaishuai](https://yyz2.discourse-cdn.com/free1/user_avatar/openmc.discourse.group/lishuaishuai/32/4219_2.png) [@Lishuaishuai](https://openmc.discourse.group/u/Lishuaishuai)\
**Post date:** [March 5, 2025, 4:29am UTC](https://openmc.discourse.group/t/the-pin-by-pin-function-of-plate-fuel-using-openmc-is-bad/5291/1 "2025-03-05T04:29:21Z")

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Hello everyone, I want to implement the pin-by-pin function of plate fuel using OpenMC, but there is a rather thorny problem at present. Based on the single-model, after the cross-sections homogenized by OpenMC are given to the multi-group function of OpenMC for calculation, the single-plate error reaches 2000pcm. But if we don’t homogenize, and output the cross-sections according to cell or material, the results are almost the same. Why is this the case?