Frozen result
S_n
3.
What was computed
175-group VITAMIN-J FW + breeder-zone spectra tallied in the P3 3-D OpenMC model (20×20k histories), normalized to P_fus 85.04 MW → S_n = 3.
Reproduce this
# Reproduce BR-L2-A23 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-A23 is anchored in the 2026-08-27 freeze spine (verdict: revised).