MCNP summary table

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DEvens

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MCNP (version 6 at least, possibly other versions) produces a summary table. An example is attached. The example shows the neutron portion of the summary table in a combined neutron/photon case. There is an SDEF card that produces photons, and the weights on that SDEF card give the relative strengths of various fuel bundles in a full reactor model. That's why the weights are so large.

The information in this table looks like it could be very useful. But in searching through the various documentation supplied with MCNP I can't find any explanation of what I'm seeing. At least, not in a form that points at the summary table. For example, the summary reports neutron creation from weight cutoff, reporting weight creation but no tracks. On the other side it reports neutron loss to weight cutoff with both weight and tracks. I don't understand what this is telling me.

I'd be glad to get an explanation. Or even a pointer to places in the docs I should be reading.
 

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