MCNP Deck Error: cannot create srctp

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SUMMARY

The forum discussion centers on an MCNP (Monte Carlo N-Particle Transport Code) deck error, specifically a "srctp" error encountered when adding multiple embedded universes. The user successfully ran a simplified version of the deck but faced issues upon introducing a third and fourth universe. A suggested solution involves clearing old runs from the directory, and advice was given to homogenize fuel elements by calculating a macroscopic average of materials like carbon, oxygen, and uranium for improved simulation accuracy.

PREREQUISITES
  • Understanding of MCNP (Monte Carlo N-Particle Transport Code) version used
  • Familiarity with simulation concepts involving embedded universes
  • Knowledge of fuel homogenization techniques in nuclear simulations
  • Experience with file management in simulation software environments
NEXT STEPS
  • Research how to clear old simulation runs in MCNP
  • Learn about fuel homogenization methods for MCNP simulations
  • Explore best practices for managing multiple embedded universes in MCNP
  • Investigate the implications of using structures smaller than 1mm in MCNP simulations
USEFUL FOR

Nuclear engineers, simulation specialists, and researchers working with MCNP who are troubleshooting deck errors and optimizing simulation parameters.

MadGander
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TL;DR
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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