Neutron flux in CEFR fuel assembly

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1

Hi,everyone.I have simulated a CEFR fuel assembly,but I’m confused by the Neutron flux results.Why Neutron flux all the same?

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cefr.ipynb (127.4 KB)

2

Hi Asch,

To me it appears that there is no leakage from your fuel region into the surrounding region. If there is no leakage uniform flux can occur because it’s essentially an infinite fuel region, the flux is also 0 in the surrounding region supporting this. Furthermore, the leakage given at the end of your transport run is 0, confirming this. I would evaluate the way you assembled the cells together, and see that there is appropriate connection that allows the transfer of neutrons outside of the fuel region.