Error in the VHTR Example (Running Simulation)

User Support
1

Hello!

I am new to OpenMC and am working on the examples, I have completed the pincell, hexagonal lattice, and triso fuel examples. I wanted to try out the VHTR reactor example
Jupyter Notebook Viewer
Everything was going well however, when I tried to run the xml exported I encounter this prompt:
More than 95% of external source sites sampled were rejected.

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image1710×922 101 KB

I tried some to change the boundaries by looking at the geom.plot(), and geom.plot(basis=‘xz’) and it didn’t work. As a last resort, I changed the only_fissionable=True to only_fissionable=False which made the simulation work. But I’m not sure if this is correct.

Any thoughts?

Thank you in advance!

2

Found a related topic after posting
95% External Source Sites Rejected - TRISO Model - User Support - OpenMC
Which said that removing the fissionable=true can be done.

If there’s a mistake with this method, it would be greatly appreciated. But for now I think its resolved