Hi, excuse me.
I have trouble in this. What is solution about this?
Please help me, thank you
It looks like there is a small mistake in your geometry that only a few particles are finding. I would take a look at where surface 5 is in your geometry and see if there is anything that could be causing the issue around there.
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@Hida Take a look at the troubleshooting guide for this:
https://docs.openmc.org/en/stable/usersguide/troubleshoot.html#warning-after-particle-crossed-surface-it-could-not-be-located-in-any-cell-and-it-did-not-leak
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