Building a Honeycomb Structure in MCNP: Error Solving

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SUMMARY

The forum discussion focuses on constructing a honeycomb structure in MCNP (Monte Carlo N-Particle Transport Code) and addresses an error message stating "Lattice in cell 2 has no fill." The user provides specific MCNP code snippets and references a document (LA-UR-13-23338) that may offer solutions but lacks details on the surface selection. Suggestions include exploring the use of RHP (Regular Hexagonal Packing) or HEX (Hexagonal) in the input to resolve the issue.

PREREQUISITES
  • Familiarity with MCNP (Monte Carlo N-Particle Transport Code) version 6 or later.
  • Understanding of hexagonal lattice structures in computational modeling.
  • Knowledge of input syntax and error handling in MCNP.
  • Basic principles of nuclear engineering and radiation transport simulations.
NEXT STEPS
  • Research the implementation of RHP (Regular Hexagonal Packing) in MCNP for lattice structures.
  • Study the HEX (Hexagonal) input options in MCNP to optimize lattice configurations.
  • Examine the document LA-UR-13-23338 for insights on surface definitions in MCNP.
  • Explore troubleshooting techniques for common MCNP error messages related to lattice fills.
USEFUL FOR

This discussion is beneficial for nuclear engineers, researchers using MCNP for radiation transport simulations, and anyone involved in modeling complex geometries in computational physics.

oksuz_
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Hi,

I am trying to build a honeycomb structure in MCNP. The code is given below. Hexagonal lattice
1 0 -1 -19 29 fill=1 imp:n=1
2 1 -2.26 -10 11 -12 13 -14 15 u=1 lat=2 imp:n=1
3 0 1:19:-29 imp:n=0

1 c/z 50 50 200
19 pz 31
29 pz -31
10 px 1
11 px -1
12 p 1 1.7320508076 0 2
13 p -1 1.7320508076 0 2
14 p 1 1.7320508076 0 -2
15 p -1 1.7320508076 0 -2

m1 6012 1
sdef
f1:n 1
nps 2000

However, it keeps giving the error of "Lattice in cell 2 has no fill"

I have come across this document

https://permalink.lanl.gov/object/tr?what=info:lanl-repo/lareport/LA-UR-13-23338

which seems to address the problem, however, it does not give any information about the surface they chose.

Can anyone give suggestion to solve the issue?

Thank you in advance.
 
Engineering news on Phys.org
What type of system is one attempting to model/simulate? VVER?

Has one tried using RHP or HEX in input?
 
Last edited:

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