4.2. Release Notes for ARMI 0.7

Here you will find the release notes for previous ARMI releases.

4.2.1. ARMI v0.7.0

Release Date: 2026-10-30

This was the biggest ARMI release in years. The materials in ARMI were completely over-hauled; from the underlying code to cleaning up and validating all the material data. The team also resolved over 20 bugs, and ARMI was releasing with no open bug tickets. And the armi.testing package is now in stable place, with a full collection of testing modules and test reactors.

4.2.1.1. Code Changes, Features

1. (PR#2472) Adding Cinder 63 energy group structure

2. (PR#2494) Updating consistent nuclide treatment

3. (PR#2507) Refactoring the ARMI materials to be based on matProps

4. (PR#2515) Adding CircleHoledCircle shape

5. (PR#2517) Support FilletedHexagon in HexBlock.getWettedPerimeter

6. (PR#2521) Move material source summary table to Bookkeeping Plugin

7. (PR#2531) Remove callReactorConstructionHook argument from db.load and loadOperator

8. (PR#2532) Creating the armi.testing package

9. (PR#2536) Reducing reliance on global nuclides

10. (PR#2555) Improving setMaterialNamespaceOrder

11. (PR#2558) Increasing test coverage - matProps loadAll exception

12. (PR#2572) Adding a plugin hook for defining a material base class

13. (PR#2574) Replacing sys.platform calls with a context.PLATFORM global variable

14. (PR#2589) Updating default nuclide flags

15. (PR#2596) Moving shared test_assemblies.py machinery to armi.testing

16. (PR#2608) Moving downstream-imported test_blocks machinery to armi.testing

17. (PR#2615) Cleaning up test_reactors imports

18. (PR#2617) Removing _Mixture material from ARMI

19. (PR#2642) Removing inefficiencies in Assembly initialization

20. (PR#2646) Ignoring negative volume components in mass-weighted averaging

21. (PR#2648) Removing child-related machinery from ArmiObject

22. (PR#2654) Improving flexibility of CaseSuite.discover

23. (PR#2669) Using a WatchedFileHandler for logging outputs

24. (PR#2670) Describing standalone custom python materials

25. (PR#2671) Makes Component directly subclass ArmiObject

26. (PR#2699) Raising an error when an ISOTXS file is not found

27. (PR#2702) Dropping support for Python 3.9 and 3.10

28. (PR#2707) Move ArmiObject to its own file and make it an abstract class

29. (PR#2714) Allowing for edge case where no new XS files are generated

4.2.1.2. Code Changes, Bugs and Fixes

1. (PR#2514) Fixing issue with CartesianBlock.getPinCenterFlatToFlat

2. (PR#2544) Reverting previous global nuclides change

3. (PR#2575) Ensuring density and pseudoDensity match for custom materials

4. (PR#2578) Removing unused check-inputs entrypoint

5. (PR#2584) Fixing missing r+ DB mode

6. (PR#2592) Fixing test smallHexReactor BP lattice

7. (PR#2599) Fixing MultiIndexLocation.getGlobalCoordinates

8. (PR#2604) Covering up a ruamel.yaml bug with zero values

9. (PR#2607) Fixing Database.genTimeSteps for EOL time steps

10. (PR#2610) Supporting Blueprint.dump without streams

11. (PR#2612) Ensuring migrations are not applied when they are not needed

12. (PR#2613) Redistribute pinNDens and detailedNDens through axial expansion

13. (PR#2618) Fixing Database.mergeHistory for EOL and error time steps

14. (PR#2623) Updating test function imports and names in our testing docs

15. (PR#2625) Fixing Block.getNumPins when there are multiple clads around a pin

16. (PR#2644) Fixing Material.getProperty for matProps properties

17. (PR#2645) Documenting that expandTo conserves mass not number of atoms

18. (PR#2647) Updating Assembly detailed number density when Core pitch changes

19. (PR#2650) Removing numMoves parameter

20. (PR#2653) Removing incorrect summarizePowerPeaking report

21. (PR#2655) Ensuring nuclides and numberDensities are numpy arrays

22. (PR#2661) Preserving full-core Cartesian block volumes on Core symmetry axes

23. (PR#2665) Applying the ruamel max_depth shim to every yamlize class, not just Blueprints

24. (PR#2679) Adding material modifications to Database.load

25. (PR#2688) Fix bug in axial expander that allowed two YAML materials to appear the same

26. (PR#2715) Avoiding writing block kgHM and kgFis params during DBload

27. (PR#2716) Reading existing ISOTXS file if core.lib does not exist

4.2.1.3. Code Changes, Maintenance, or Trivial

1. (PR#2485) Adding an author to the project

2. (PR#2486) Speeding up unit tests

3. (PR#2489) Speeding up unit tests again

4. (PR#2490) Changing the order of the named parameters in armi.init

5. (PR#2491) Adding MeV unit

6. (PR#2493) Supporting Python 3.14

7. (PR#2498) Stopping forked repos from running MacOS CI

8. (PR#2499) Removing matProps dataSchema

9. (PR#2500) Speeding up the slowest unit tests

10. (PR#2502) Removing unnecessary warning

11. (PR#2503) Reducing warnings from settings version and Composite.getComponent

12. (PR#2506) Improving error handling in HexComponentsToCylConverter

13. (PR#2508) Stop codecov.io from incorrectly failing the build

14. (PR#2510) Improving error message in settings validation

15. (PR#2516) Bump pypdf from 5.3.1 to 6.10.2

16. (PR#2518) Bump jinja2 from 3.1.5 to 3.1.6

17. (PR#2522) Moving 15 parameters out of ARMI

18. (PR#2523) Clean up runtime warnings

19. (PR#2524) Trying to stop codecov.io from failing the build

20. (PR#2527) Cleanup reports

21. (PR#2528) Renaming matProps.Material to MatPropsMaterial

22. (PR#2529) Removing deprecated API endpoints

23. (PR#2530) Removing classN_custom_isotopics

24. (PR#2537) Trying to stop codecov.io from failing the build

25. (PR#2540) Upgrading GH Actions dependencies to newer versions

26. (PR#2546) Adding ArgumentDefaultsHelpFormatter to EntryPoint.parser

27. (PR#2547) Lowering the priority of some settings-related log messages

28. (PR#2548) Reducing warnings from B10 Block calculation

29. (PR#2549) Removing pinned wxpython dependency for grids

30. (PR#2552) Bump pypdf from 6.10.2 to 6.12.0

31. (PR#2564) Removing exception logging on HexBlock.verifyBlockDims

32. (PR#2567) Bump pypdf from 6.12.0 to 6.13.3

33. (PR#2569) Adding unit tests for HexBlocks.setPinPowers()

34. (PR#2579) Adding missing test case for matProps.loadAll()

35. (PR#2585) Moving buildOperatorOfEmptyHexBlocks to armi.testing

36. (PR#2586) Redesigning our codecov.io config

37. (PR#2601) Adding in ruff setting D404

38. (PR#2605) Making _geomOptions None by default

39. (PR#2606) Bump pypdf from 6.13.3 to 6.14.2

40. (PR#2626) Banning AM242 from nuclide flags

41. (PR#2630) Improving warnings on negative DPA calculations

42. (PR#2631) Bumping pypdf from 6.14.2 to 6.15.0

43. (PR#2636) Making Composite.changeNDensByFactor safe for Components

44. (PR#2637) Unpinning PyPDF

45. (PR#2649) Removing unnecessary r-strings

46. (PR#2652) Removing Composite.containsHeavyMetal()

47. (PR#2663) Ensuring all CI workflows from forked repos run

48. (PR#2672) Removing reference to very old shuffle file format

49. (PR#2675) Adding code coverage to cacheCall

50. (PR#2681) Cleaning up unused nucDir functions

51. (PR#2682) Cleaning up unused function applyIsotopicsMix

52. (PR#2683) Removing duplicate code in applyMaterialMassFracsToNumberDensities

53. (PR#2690) Adding code coverage to the LatticePhysicsInterface

54. (PR#2691) Cleaning up materials modification validation

55. (PR#2694) Move recursive settings file search logs from extra to debug

56. (PR#2695) Removing unused arg for DB compare CLI

57. (PR#2698) Renaming Block Parameter puFrac to puHMFrac

58. (PR#2704) Removing cluster-specific code from ARMI

4.2.1.4. Documentation-Only Changes

1. (PR#2487) Starting version 0.7.0 release cycle

2. (PR#2492) Updating license section of the pyproject.toml

3. (PR#2519) Adding documentation for matProps

4. (PR#2541) Attempting to fix GH Pages docs deploy

5. (PR#2545) Fixing material doc header levels

6. (PR#2554) Cleaning up simple typos in documentation

7. (PR#2556) Adding context to depletion cycle settings

8. (PR#2559) Cleaning up matProps test docstring

9. (PR#2563) Removing “power user” langauge from docs

10. (PR#2571) Unifying and improving multiple Entry Point documentation sections

11. (PR#2588) Documenting lattice map format

12. (PR#2595) Validating the PR correctly fills the SCR

13. (PR#2598) Documenting physics parameters retained on shuffling

14. (PR#2616) Adding responsible LLM guidelines to Docs

15. (PR#2622) Getting ARMI docs building correctly

16. (PR#2624) Attempting to speed up the docs build on GitHub

17. (PR#2632) Increasing ARMI HTML and PDF documentation TOC depth

18. (PR#2635) Adding and enforcing test function and class naming standards

19. (PR#2639) Fixing hung GitHub Docs CI build

20. (PR#2659) Fix incorrectly labeled implementations for R_ARMI_CMP_NUC and R_ARMI_CMP_GET_NDENS

21. (PR#2666) Documenting the materialNamespaceOrder input setting

22. (PR#2668) Fixing apt-get errors on CI that are killing the doc build

23. (PR#2685) Adding new req R_ARMI_MAT_CUSTOM and clean up duplicate namespace reqs

24. (PR#2696) Clarifying validBlockTypes setting in docstrings

25. (PR#2701) Fixing code block formatting in inputs.rst

26. (PR#2705) Improving highest-level ARMI architecture diagram

27. (PR#2712) Cleaning up the top-level README

28. (PR#2713) Improving User Documentation

29. (PR#2718) Improving language for docs of Assembly “xs type”