This is the deposited breeding-blanket neutronics, running live in your browser — change the
design and net TBR recomputes on the actual engine (a reduced-order surrogate; OpenMC retires it). Before the
controls unlock it re-derives the reduced-order blanket point. The authoritative TBR is the frozen OpenMC lever
(gate BR-L2-A7): 1.03–1.06 with the literal recipe, rising to 1.18–1.20 with a dedicated solid-Be layer —
the build basis. Tritium is marginal, not a surplus. The live surrogate below is directional; request the full OpenMC run for the lever.
Honest gate — closure H-C1 (two-tier) Tritium self-sufficiency needs net TBR ≥ 1.0. The frozen
OpenMC lever (gate BR-L2-A7) reaches 1.03–1.06 (literal recipe, Be packing 9.6–11.8 vol%) and 1.18–1.20 with a
dedicated 5 cm solid-Be layer — the build basis. Hyperion closes on-model as a breeder platform with a thin 3–6% margin;
demonstrated = measured TBR at FOAK first-tritium (~2030–31). This reduced-order surrogate under-predicts the OpenMC lever —
treat it as directional. Net electricity is a category error, excluded.