MCNP Deck Error: cannot create srctp

[MadGander]

TL;DR Summary

I'd appreciate some help trying to find the root issue causing the source error.

Hi all,

I'm working with an MCNP deck with 4 embedded universes and am having trouble with a srctp error when attempting to run the deck. I had the simplified version with the larger two universes running fine, but when I try to add in the third and fourth layers I experience this error. Would appreciate any help that can be provided. Thanks.

 

[Alex A]

Hiya, that is usually down to not clearing old runs from the directory. Could that be your issue?

Structures smaller than 1mm don't make a lot of sense for this sort of simulation. I think you should homogenize your fuel. Work out a macroscopic average for the fuel; carbon, oxygen, uranium etc and use that as a fuel element.