What was computed
FESTIM: steady perm 5.2e14 T/m2/s (~0.08 g/m2/fpy, 0.6% of flux), W-diffusion-limited; analytic match 1e-7
Reproduce this
# Reproduce BR-L2-A25 against the frozen record pip install kronos-toolkit # github.com/KronosFE/kronos-toolkit python -c "from kronos_toolkit.verify import run_regression; run_regression()" # BR-L2-A25 is anchored in the 2026-08-27 freeze spine (verdict: reproduced).