Center-Post Replacement Strategy

A short center-post life is only acceptable if replacement is fast and remote; the machine is segmented and tooled for it from the start.

Designed to be swapped

Because the center-post is damage-limited to roughly 0.01 full-power-years, replacement is a routine planned operation, not a rebuild. The machine is designed so the center-post can be removed and a new one installed remotely, within a maintenance window, without dismantling the whole device. This is the engineering answer to the short-life constraint.

What replacement demands

• A center stack segmented for access to the post.
• Remote tooling to extract and install in a high-dose field.
• Fast connect/disconnect of current, coolant, and structure.
• A maintenance schedule that plans for the swap interval.

Why this shapes the machine

Replaceability is a top-level design driver, not a maintenance detail. It influences how the center stack is built, where joints and seals go, how remote handling reaches the post, and how the schedule accounts for downtime. The whole machine is arranged around being able to change its hardest-working part.

Honest posture

The breeder states the short center-post life and the replacement plan together. A design that hid the ~0.01 fpy note would look tidier and be dishonest; publishing both the constraint and the engineered response is the point of an on-the-record machine.

Spares and outage readiness

A short replacement interval only yields good availability if a qualified spare center-post is ready before each outage. The breeder plans center-post manufacture as an ongoing supply, so the swap is limited by the remote-handling operation rather than by waiting for a part, aligning the supply chain with the ~0.01 fpy cadence.

This page documents a design and simulation study, not a built machine. Construction begins Q2 2027; first-of-a-kind first tritium is targeted near 2030. Figures are computed, reproducible targets, not measurements.