During January 2025, Nick Touran focused on improving reliability in the terrapower/armi repository by addressing validation issues in cross-section type handling. He introduced explicit error handling in Python, ensuring that the getXSTypeLabelFromNumber function raises a ValueError when provided with an invalid xsTypeNumber below 65. This change prevents downstream data corruption and runtime errors by enforcing stricter input validation. Nick also refactored related unit tests to cover the new valid ranges and exception scenarios, enhancing test coverage and robustness. His work demonstrated careful attention to error handling, refactoring, and unit testing, resulting in a more resilient codebase.