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1. Commits on Oct 20, 2026

   • Build fine energy group structures (#4176)

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     yrrepy

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     paulromano

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   • Add native stellarator plasma source sampling (#4187)

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   • Find only the C++ OpenMP component for projects that link against OpenMC (#4201)

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   • Convert path_input to str in _process_CLI_arguments (#4188)

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     barlowa124

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     paulromano

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   • Fix double normalization in random ray VTK flux (#4192)

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     agourakis82

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     paulromano

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2. Commits on Oct 17, 2026

   • Recognize libc++ uncaught exception messages when OpenMC aborts (#4196)

     kavyawadhwa134

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3. Commits on Oct 16, 2026

   • Find HDF5 in OpenMCConfig.cmake for projects that link against OpenMC (#4197)

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     kavyawadhwa134

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     paulromano

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4. Commits on Oct 15, 2026

   • Remove osx-64 conda workaround for Apple silicon from install docs (#4193)

     kavyawadhwa134

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5. Commits on Oct 13, 2026

   • Add implied a_0 to File 6 two-body Legendre distributions (#4190)

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     GuySten

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     claude

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   • Fix source plotting scale bug (#4189)

     shimwell

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6. Commits on Oct 10, 2026

   • Annihilate positrons below the positron energy cutoff (#4157)

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7. Commits on Oct 9, 2026

   • Fix temperature interpolation at the high endpoint (#4169)

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     agourakis82

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     paulromano

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   • Fix Model.run returning a stale statepoint on coarse timestamps (#4184)

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8. Commits on Oct 8, 2026

   • Fix variance tally trigger to use its own uncertainty ratio (#4175)

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     yrrepy

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     paulromano

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   • Use int64 flat filter index in WeightWindows::update_weights (#4174)

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     yrrepy

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     paulromano

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   • Report unresolvable nuclide names instead of terminating (#4130)

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   • Preserve ENDF target excitation and reaction metadata in HDF5 (#4146)

     paulromano

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9. Commits on Oct 7, 2026

   • Broadcast tally results in chunks (#4125)

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   • Assign the delayed yield to every delayed group (#4148)

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   • Avoid NaN standard deviation from roundoff in Tally.std_dev (#4127)

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   • Close tally group for internal tallies on statepoint load (#4173)

     yrrepy

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   • Clarify AI disclosure and security reporting policies (#4172)

     paulromano

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10. Commits on Oct 6, 2026

    • Restrict pull request merging to Technical Committee members (#4171)

      paulromano

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11. Commits on Oct 5, 2026

    • Follow-up to Clip negative atom densities: Cleanup of redundant warnings and clips (#4170)

      yrrepy

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12. Commits on Oct 4, 2026

    • Avoid ldexp call when converting random numbers to double (#4159)

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      GuySten

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      claude

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13. Commits on Oct 3, 2026

    • Fix input_path resolving empty filenames to cwd (#4154)

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      Arthur031221

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      paulromano

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    • test: reuse canonical unstructured mesh assets (#4152)

      kvnloo

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    • Add a length multiplier option for XDG meshes. (#4155)

      nuclearkevin

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    • test: share weight-window data paths (#4151)

      kvnloo

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    • test: share DAGMC unit-test geometry fixtures (#4150)

      kvnloo

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14. Commits on Sep 27, 2026

    • Add XDG support for unstructured mesh tallies (#3889)

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15. Commits on Sep 25, 2026

    • Add OpenAI config YAML file for reviewing-openmc-code skill (#4145)

      paulromano

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16. Commits on Sep 22, 2026

    • Add PNNL material composition library (#4134)

      paulromano

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17. Commits on Sep 20, 2026

    • Set format install to fix git repo builds (#4143)

      nuclearkevin

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18. Commits on Sep 19, 2026

    • Enable unused variable warnings (#4142)

      paulromano

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