Spare Parts and Component Lifecycle

L7 links predicted degradation to spare inventory and long-lead manufacturing so the right component is staged before a unit needs it, fleet-wide.

Matching parts to predicted need

High-value fusion components have long manufacturing lead times: superconducting magnets, first-wall modules, and direct-energy-conversion electrode assemblies cannot be sourced overnight. L7 spare-parts lifecycle management reads the fleet's remaining-useful-life forecasts and ensures a spare exists, staged and qualified, before the predicted need date minus the lead time.

Lead time is the binding variable

# trigger procurement when predicted-need minus lead-time is near
for comp in fleet_components():
    need_date = now + rul(comp, now)          # from predictive maintenance
    order_by  = need_date - lead_time(comp.type) - safety_margin
    if now >= order_by and not staged(comp.type):
        procure(comp.type)                    # start long-lead manufacture
    if staged(comp.type) and expiring(spare(comp.type)):
        requalify(spare(comp.type))           # shelf-life / re-cert

Spares themselves have a lifecycle. A staged superconducting magnet or an electrode assembly may have shelf-life, storage, and re-qualification requirements; a spare that sits too long must be re-certified before use. L7 tracks each spare's own condition and certification, so a nominally available spare is never assumed serviceable without verification.

The fleet view is what makes this efficient. A pool of spares shared across a breeder foundry, or across a burner fleet of the same design, covers many units with fewer total spares than per-unit stocking, because failures are staggered. Fleet learning sharpens the failure distribution the pool is sized against, so the pool is neither over- nor under-provisioned as the fleet matures from FOAK to NOAK to BOAK.

Commonality across the design generations matters: components shared between FOAK, NOAK, and BOAK units draw from one pool, while generation-specific parts are tracked separately. L7 maintains the bill of materials per generation so a spare is matched to a compatible unit.

Lifecycle management runs today against twin-derived RUL and modeled lead times; no physical spares are consumed before units operate. The interface is proven now so procurement can begin ahead of first hardware need after construction start in Q2 2027.