MCNP Deck Error: cannot create srctp

AI Thread Summary
The user is encountering a srctp error while running an MCNP deck with four embedded universes, having previously succeeded with a simplified version. A suggestion was made to clear old runs from the directory, which could be causing the issue. Additionally, it was advised that structures smaller than 1mm may not be suitable for this simulation. Homogenizing the fuel by calculating a macroscopic average of its components like carbon, oxygen, and uranium is recommended. Addressing these points may help resolve the user's problem.
MadGander
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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.
 

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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.
 

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