Start here
For command-line calculations, install ACTINV and its selected data bundle, create a problem file, validate it, then run the calculation. The official quick start walks through each step.
pip install actinv
actinv data fetch
actinv new problem.json
actinv validate problem.json
actinv run problem.json result.jsonCalculation model
ACTINV builds a nuclide inventory from the declared material, flux spectrum, irradiation and cooling schedule, and evaluated nuclear data. It advances the network with CRAM-16 or CRAM-48, then calculates requested responses.
Inputs and nuclear data
Problem files identify materials, spectra, schedules, and selected outputs. Users install and select nuclear-data files; ACTINV records data identities and does not silently fill missing evaluations.
Input fields, schedules, units, and supported combinations.
Source, versions, verification, and artifact terms.
Documented evaluation limits and affected benchmark targets.
Result records
Results can include inventories, activity, decay heat, photon sources, production pathways, supported radiological responses, uncertainty bands, and a ledger of missing data and approximations. Review the recorded inputs and scope with the result.
Validation evidence
Public evidence includes the 132-experiment FNS decay-heat corpus across 73 materials, FNG/ITER activation-history reproduction, numerical controls, and comparisons with other calculation paths. The detailed reports preserve data versions, metrics, exclusions, acceptance rules, and limitations.
Competitive benchmark comparisons include ACTINV 1.1.2-era experiments and are not fresh measurements of every v1.3.1 feature. Accuracy, data selection, code-to-code agreement, and numerical-kernel timing answer different questions; the records describe each comparison’s scope.
See what each test checks and what remains unresolved.
Accuracy, code comparisons, and speed measurements with their boundaries.
Detailed methods, dated figures, and links to source records.
Qualification boundary
ACTINV is research-grade software. It does not perform particle transport, criticality, spatial material exchange, or thermal and flux feedback. A result certificate records its inputs; it does not establish that those inputs are suitable for a particular analysis.
Analysts remain responsible for data applicability, independent review, uncertainty and margins, configuration control, and any required acceptance process.
Source and releases
ACTINV v1.3.1 is the current software release. Nuclear data and desktop preview installers have separate release records and versions. Check the release page before installing a package or reproducing a study.