Issues

• Use of !include in yaml files throws off line numbers in yaml error reporting

  terrapower/armi#2724 · Filter by author drewj-tp opened on Nov 2, 2026
  2

• Problem with C5G7 guide tube

  bugtesting
  terrapower/armi#2722 · Filter by author john-science opened on Oct 30, 2026
  

• Test edge cases in cross-section generation

  testing
  terrapower/armi#2720 · Filter by author john-science opened on Oct 30, 2026
  1

• Upgrade ARMI documentation dependencies

  dependenciesdocumentation
  terrapower/armi#2719 · Filter by author opotowsky opened on Oct 29, 2026
  1

  

• Add support for cross section groups with numerical labels

  enhancementgood first issue
  terrapower/armi#2717 · Filter by author keckler opened on Oct 28, 2026
  4

  

• Logic always triggers in the latticePhysicsInterface to skip cross section generation for cycle 0 by default

  enhancement
  terrapower/armi#2710 · Filter by author bsculac opened on Oct 23, 2026

• Remove import-time metaclass ArmiObject subclass registration

  cleanup
  terrapower/armi#2708 · Filter by author yardasol opened on Oct 22, 2026
  7

• Add more support for custom python materials

  terrapower/armi#2703 · Filter by author opotowsky opened on Oct 16, 2026
  2

• Provide a TestCase subclass/mixin for running in a temp dir

  feature requesttesting
  terrapower/armi#2684 · Filter by author drewj-tp opened on Oct 2, 2026
  5

  

• Convert asserts to proper exceptions

  cleanupgood first issuelow priority
  terrapower/armi#2664 · Filter by author drewj-tp opened on Sep 21, 2026
  1

• Strictly define allowed types and flags in ARMI

  cleanupenhancement
  terrapower/armi#2658 · Filter by author yardasol opened on Sep 16, 2026
  2

• Request to store the assembly blueprint "specifier" on assembly objects

  feature request
  terrapower/armi#2651 · Filter by author keckler opened on Sep 4, 2026
  7

• Pass move list to fuel handler repeat shuffle

  cleanupfeature requestlow priority
  terrapower/armi#2641 · Filter by author drewj-tp opened on Aug 20, 2026

• Separate shuffle file reading from shuffling

  architecturecleanupfeature requestlow priority
  terrapower/armi#2640 · Filter by author drewj-tp opened on Aug 20, 2026

• Cache Assembly- and Block-Level Detailed Number Density Vectors

  feature requestoptimization
  terrapower/armi#2627 · Filter by author albeanth opened on Aug 6, 2026
  5

• Block.p.initialB10ComponentVolume not updated through axial expansion / redistribution

  enhancement
  terrapower/armi#2619 · Filter by author drewj-tp opened on Aug 5, 2026
  2

• Add unit tests for untested HexBlock functions

  testing
  terrapower/armi#2602 · Filter by author yardasol opened on Jul 23, 2026
  1

  

• Support read-write workflow for ARMI DBs

  feature requestlow priority
  terrapower/armi#2587 · Filter by author opotowsky opened on Jul 14, 2026
  4

• heightBOL should be VOLUME_INTEGRATED instead of AVERAGE

  enhancement
  terrapower/armi#2550 · Filter by author mgjarrett opened on Jun 5, 2026
  3

• Operator.snapshotRequest seemingly does not use full database path when copying Loading definition for snapshot

  cleanupenhancement
  terrapower/armi#2539 · Filter by author john-science opened on May 19, 2026

• Implement data schema validation for matProps-loaded yaml files

  feature request
  terrapower/armi#2504 · Filter by author opotowsky opened on Apr 14, 2026

• Support passing formatting args to at least runLog.debug

  optimization
  terrapower/armi#2495 · Filter by author drewj-tp opened on Apr 7, 2026
  5

• Support moving / retrieving files with MPI directory changer

  feature request
  terrapower/armi#2474 · Filter by author drewj-tp opened on Mar 12, 2026

• Material.refDens is an instance variable, but should not be

  enhancement
  terrapower/armi#2467 · Filter by author john-science opened on Mar 6, 2026
  4

  

• Support creating assemblies from blueprints in parallel

  complexfeature requestoptimization
  terrapower/armi#2465 · Filter by author drewj-tp opened on Mar 2, 2026
  4