Insights · Fuel
The fuel cycle is the silent schedule risk
Reactor drawings get the attention. Fuel decides the calendar. An advanced core that needs a non-standard assay, a coated particle, or a hydride form is only as real as the line that can produce it under safeguards, on spec, in quantity.
Most Western commercial plants still run on low-enriched uranium in familiar assemblies. Many compact and high-temperature designs want something else: higher assay, different cladding, different geometry. That is not a footnote. Conversion, enrichment, fabrication, and transport each have their own qualification wall. Miss one, and a finished vessel sits cold.
Treat inventory as a design requirement
Serious programs specify fuel the way they specify the pressure boundary. They ask, early:
- Which assay band is actually available on a peacetime commercial path?
- Which fabrication shops are qualified for this form — not merely interested?
- What is the reload plan if the first core is a success and the second cannot wait five years?
National-security users feel this first. A microreactor that cannot be refueled from a trusted inventory is a demonstration, not a capability. Fuel-cycle architecture belongs in the system spec, next to megawatts and mass.