Heating tally changes values when running locally vs HPC

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Hello,

I recently got OpenMC on a HPC at work it has been a little bit of a challenge to get it running but I finally did. However, I ran a test case and surprisingly the values are different for heating. I didn’t change anything, am using the same data files, same geometry. The weirdest part is the difference is not across the board, it only pertains to photon and positron heating numbers. Neutron heating, electron heating, n,2n reaction rates, they are all the same. It also seems like in HPC, it splits the heating between photon/positron more evenly but in the local environment it attributes more to positrons. The uncertainties are all pretty low, for reference. Any ideas on why it may be doing this?

  1. neutron: 8.42e+06 vs 8.49e+06
  2. photon: 6.34e+4 (HPC) vs 2.29e+3 (local venv)
  3. electron: 1.15e+6 vs 1.17e+6
  4. positron: 5.48e+4 (HPC) vs 1.28e+5 (local venv)
  5. photon & positron heating summed: 1.18e+5 (HPC) vs 1.30e+5 (local env)