Fix config change not propagating through to decay energies #2825
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Description
Changing the
openmc.config
chain file was not propagating through to changing theDECAY_ENERGIES
variable, giving incorrect results if a user wished to compare decay heats between two chains.For example, I was trying to assess how much error the CASL decay chain introduced compared to the full ENDF chain. I was finding some strange results, with decay heat far below 7% for a PWR pin cell.
Fixes #2824
Also ran autopep8 on config.py.
Before this change (wrong)
After this change (right, expected 7% decay heat)