Issues

• Weight Window Issues

  Bugs
  openmc-dev/openmc#4165 · Filter by author yrrepy opened on Oct 3, 2026

• Particle loss across virtual surface crossings in complex regions

  Bugs
  openmc-dev/openmc#4140 · Filter by author yrrepy opened on Sep 17, 2026

• Adding a sublibrary to the test data means republishing all of it

  Data
  openmc-dev/openmc#4138 · Filter by author GuySten opened on Sep 17, 2026

• Random ray VTK plot flux is divided by the active batch count twice

  openmc-dev/openmc#4137 · Filter by author paulromano opened on Sep 17, 2026

• Add ability to set transport correction ratios externally

  openmc-dev/openmc#4107 · Filter by author GiudGiud opened on Sep 2, 2026

• DAGMC Model Test Fixutres

  openmc-dev/openmc#4093 · Filter by author pshriwise opened on Aug 31, 2026
  3

• Save/document source of Nuclear Data in HDF5 files and data download site

  openmc-dev/openmc#4075 · Filter by author kosbor-personal opened on Aug 27, 2026
  4

• Angular flux tallying capabilities for Random Ray

  openmc-dev/openmc#4071 · Filter by author j-fletcher opened on Aug 21, 2026
  2

• MG mode: density_mult applied to total/absorption tally scores but not fission/nu-fission/scatter

  Bugs
  openmc-dev/openmc#4070 · Filter by author dallonby opened on Aug 21, 2026
  2

• CADIS or FW-CADIS Weight windows from adjoint solution on exodus files

  openmc-dev/openmc#4061 · Filter by author not-fahim opened on Aug 12, 2026
  3

• The test test_mcpl_stat_sum fails

  Bugs
  openmc-dev/openmc#4054 · Filter by author yurivict opened on Aug 6, 2026

• Add Fusion Neutronics Workshop to Example page

  Documentation
  openmc-dev/openmc#3996 · Filter by author approx-infinity opened on Jul 4, 2026
  1

• Improve connection between theory manual and user manual for tallies

  Documentation
  openmc-dev/openmc#3985 · Filter by author gonuke opened on Jun 26, 2026
  

• Hybrid delta tracking

  delta trackingOther Enhancement
  Feature

  openmc-dev/openmc#3975 · Filter by author nuclearkevin opened on Jun 19, 2026
  

• continue_timesteps producing h5 files with incomplete information when used to restart a simulation that did not specify final_step = True in Integrator

  Bugs
  openmc-dev/openmc#3973 · Filter by author lewisgross1296 opened on Jun 16, 2026
  1

• openmc.model.RectangularParallelepiped could automatically handle periodic surfaces

  openmc-dev/openmc#3966 · Filter by author lewisgross1296 opened on Jun 10, 2026

• Security: request for a private disclosure channel

  Bugs
  openmc-dev/openmc#3947 · Filter by author cesabici-bit opened on May 28, 2026

• Structured mesh TLE when delta tracking

  openmc-dev/openmc#3902 · Filter by author jpmorgan98 opened on Mar 26, 2026

• record cross section library used in output

  openmc-dev/openmc#3887 · Filter by author bohmt opened on Mar 18, 2026
  1

• Refactor photon interaction to be more like neutron interaction.

  Other Enhancement
  openmc-dev/openmc#3883 · Filter by author GuySten opened on Mar 17, 2026

• Move depletion chain from XML to HDF (?)

  DepletionI/O
  openmc-dev/openmc#3882 · Filter by author drewejohnson opened on Mar 17, 2026
  1

• Adding indices at coords to other structured mesh types

  Good for first-timers
  openmc-dev/openmc#3867 · Filter by author shimwell opened on Mar 12, 2026
  1

• Allow sampling a PowerLaw over negative domain for even powers

  openmc-dev/openmc#3859 · Filter by author gonuke opened on Mar 7, 2026
  1

• Create a new class for particle ray tracing

  openmc-dev/openmc#3833 · Filter by author vitmog opened on Feb 23, 2026
  1

• Hanging in CI related to DAGMC test

  Bugs
  openmc-dev/openmc#3826 · Filter by author paulromano opened on Feb 19, 2026
  8