What was computed
He-bubble rate-theory (Xolotl exec build-broken->reduced 0-D vdW model): W PFC 2.3e23/m3 r0.63nm 0.024% swell @226appm He/1fpy; Fe-9Cr 0.017%. Dense-limit swell robust, <<1-5% PFC limit, NOT life-limiting. Xolotl hi-fi = future arbiter | fleet KMC corroborates: nano-bubbles, sub-1% swelling (two independent methods agree)
Reproduce this
# Reproduce BR-L2-A26 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-A26 is anchored in the 2026-08-27 freeze spine (verdict: revised).