Building a Honeycomb Structure in MCNP: Error Solving

[oksuz_]

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.

 

[Astronuc]

What type of system is one attempting to model/simulate? VVER?

Has one tried using RHP or HEX in input?

 

[raining Pete]

Hi,

I am not an expert in MCNP, but I do have some experience with building honeycomb structures in other codes. From what I can see, it looks like your lattice in cell 2 is not properly defined. The fill and imp:n parameters are necessary for MCNP to understand the material and boundaries within the cell. I would suggest checking your lattice definition and making sure it is correct.

Also, have you tried reaching out to the authors of the document you mentioned? They may be able to provide more information or insights on the surface they chose. Another option could be to search for similar examples or tutorials online to see how others have defined honeycomb structures in MCNP.

I hope this helps and good luck with your project!