Keff values vs expect values

Hi,here is my python script for modeling the SNAP-10A core with openmc0.13.0 and ENDF/B-VIII.0 library,but I get a strange keff value of 0.02, the expect keff should be about 1.00,where is the problem?

Thanks! (16.2 KB)
8490a_input_MCNP.xml (6.8 KB)
8490a_out.xml (2.2 MB)

Hi @zhaozelong,

I pulled down the model and gave it a try. When I ran OpenMc with the -g flag (openmc -g), it indicated that cells 100 and 1 were overlapping. You’ll want to resolve that issue in the geometry definition and try again.

Hope this helps,


That’s a very helpful message,I will try to modified and fixed it. Besides, I add the MCNP input and output file,the results of MCNP is 1.0052. Hope this is helpful.