eprdata14 XS Data: Faulty?
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Update: These two problems are without a doubt coupled:
https://github.com/openmc-dev/data/issues/81
https://github.com/openmc-dev/openmc/issues/2421
It is likely the division errors in the from_ace routine
I believe there is an issue with the data converted from the LANL MCNP eprdata14 ACE file.
This affects ENDF7.x LANL libraries
https://openmc.org/lanl-data-libraries/
It appears that several of the eprdata14 XS are not being 'leveraged' in OpenMC; in my problem a number of the photons undergo far fewer reactions than with other libraries.
When I convert EPICS2017 myself, EPICS2014 myself and use them with ENDF80 neutron data I get the same answer as with Official release OpenMC ENDF80 np. Which is significantly different than with eprdata14 (using OpenMC official endf80 neutron data).
I have not been able to convert eprdata14 ACE myself, see openmc-dev/openmc#2421
Running the same problem in MCNP6.2 with mcplib84, eprdata14 and jendl50 (EPICS2017) I get the same results in all. No major deviation for eprdata14
I am running OpenMC 0.13.3-dev.
Here are some results with the photon_source test.
Slightly modified (vaccuum conditions, 10 batches, Absorption score), see attached model.zip
| Type | Data Lib. | Source | Flux | 1σ | Abs. | 1σ | |||
|---|---|---|---|---|---|---|---|---|---|
| self | - | EPICS2014 | 226.084 | 0.336563 | 3.08141 | 0.005001 | |||
| self | - | EPICS2017 | 226.001 | 0.339056 | 3.08162 | 0.005027 | |||
| Official | ENDF80 | EPICS2017 | 226.001 | 0.339056 | 3.08162 | 0.005027 | |||
| Other | FENDL32 | epdl97 | 225.826 | 0.259935 | 3.08422 | 0.008049 | |||
| LANL | ENDF7.1 | eprdata14 (EPICS2014) | 2711710000 | 2859620 | 0 | 0 |