More than 95% of external source sites sampled were rejected

User Support
1

why when i use source setting like this

    bounds = [-6.3, -6.3, -6.3, 6.3, 6.3, 6.3]
    uniform_dist = openmc.stats.Box(bounds[:3], bounds[3:], only_fissionable=True)
    settings_file.source = openmc.Source(space=uniform_dist)

in 0.13.0，openmc gives correct Eigenvalue calculation results
but when use source setting like this：

    bounds = [-6.3, -6.3, -6.3, 6.3, 6.3, 6.3]
    spatial_dist=openmc.stats.Box(bounds[:3], bounds[3:])
    source=openmc.IndependentSource(space=spatial_dist,constraints={'fissionable':True})  
    settings_file.source = source

in0.15.0，openmc throws “ERROR: More than 95% of external source sites sampled were rejected. PleaseMore than 95% of external source sites sampled were rejected. Please check your external source’s spatial definition.”？
quite annoying…
is there any help？ many thx！

2

this problem have been solved

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