ERROR: Maximum number of external source spatial resamples reached!

User Support
1

hi all

i’m encountering an error: “ERROR: Maximum number of external source spatial resamples reached!” and i don’t know what does it meas and how to remove it

2

i simulated the HFP condition of full size PWR with UO2 fuel. but when i added some more cells and universes in the same input file, in order to incorporate the IMF fuel along with UO2, i encountered this error.

3

Hi Anas,

OpenMC allows you to define a source definition that extends beyond the defined geometry. However, if you do so, any source sites that are sampled outside of the defined geometry will be rejected. In version 0.8.0 and before, if the number of rejected sites reached 10000, the simulation would abort. We’ve improved this treatment in the developmental branch of OpenMC; now a fatal error occurs only if 95% of source sites are rejected (note that there is no hard limit).

If you are running an eigenvalue calculation (where the initial source guess is somewhat arbitrary), I would suggest that you reduce the spatial extent of your source definition so that it is completely within the defined geometry.

Best regards,
Paul